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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.lang3;

import java.io.File;

/**
 * Helpers for {@code java.lang.System}.
 *
 * 

* If a system property cannot be read due to security restrictions, the corresponding field in this class will be set * to {@code null} and a message will be written to {@code System.err}. *

*

* #ThreadSafe# *

* * @since 1.0 * @see SystemProperties */ public class SystemUtils { /** * The prefix String for all Windows OS. */ private static final String OS_NAME_WINDOWS_PREFIX = "Windows"; // System property constants // ----------------------------------------------------------------------- // These MUST be declared first. Other constants depend on this. /** * The {@code file.encoding} System Property. * *

* File encoding, such as {@code Cp1252}. *

*

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getFileEncoding() * @since 2.0 * @since Java 1.2 */ public static final String FILE_ENCODING = SystemProperties.getFileEncoding(); /** * The {@code file.separator} System Property. * The file separator is: * *
    *
  • {@code "/"} on UNIX
  • *
  • {@code "\"} on Windows.
  • *
* *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getFileSeparator() * @deprecated Use {@link File#separator}, since it is guaranteed to be a * string containing a single character and it does not require a privilege check. * @since Java 1.1 */ @Deprecated public static final String FILE_SEPARATOR = SystemProperties.getFileSeparator(); /** * The {@code java.awt.fonts} System Property. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaAwtFonts() * @since 2.1 */ public static final String JAVA_AWT_FONTS = SystemProperties.getJavaAwtFonts(); /** * The {@code java.awt.graphicsenv} System Property. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaAwtGraphicsenv() * @since 2.1 */ public static final String JAVA_AWT_GRAPHICSENV = SystemProperties.getJavaAwtGraphicsenv(); /** * The {@code java.awt.headless} System Property. The value of this property is the String {@code "true"} or * {@code "false"}. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see #isJavaAwtHeadless() * @see SystemProperties#getJavaAwtHeadless() * @since 2.1 * @since Java 1.4 */ public static final String JAVA_AWT_HEADLESS = SystemProperties.getJavaAwtHeadless(); /** * The {@code java.awt.printerjob} System Property. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaAwtPrinterjob() * @since 2.1 */ public static final String JAVA_AWT_PRINTERJOB = SystemProperties.getJavaAwtPrinterjob(); /** * The {@code java.class.path} System Property. Java class path. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaClassPath() * @since Java 1.1 */ public static final String JAVA_CLASS_PATH = SystemProperties.getJavaClassPath(); /** * The {@code java.class.version} System Property. Java class format version number. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaClassVersion() * @since Java 1.1 */ public static final String JAVA_CLASS_VERSION = SystemProperties.getJavaClassVersion(); /** * The {@code java.compiler} System Property. Name of JIT compiler to use. First in JDK version 1.2. Not used in Sun * JDKs after 1.2. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaCompiler() * @since Java 1.2. Not used in Sun versions after 1.2. */ public static final String JAVA_COMPILER = SystemProperties.getJavaCompiler(); /** * The {@code java.endorsed.dirs} System Property. Path of endorsed directory or directories. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaEndorsedDirs() * @since Java 1.4 */ public static final String JAVA_ENDORSED_DIRS = SystemProperties.getJavaEndorsedDirs(); /** * The {@code java.ext.dirs} System Property. Path of extension directory or directories. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaExtDirs() * @since Java 1.3 */ public static final String JAVA_EXT_DIRS = SystemProperties.getJavaExtDirs(); /** * The {@code java.home} System Property. Java installation directory. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaHome() * @since Java 1.1 */ public static final String JAVA_HOME = SystemProperties.getJavaHome(); /** * The {@code java.io.tmpdir} System Property. Default temp file path. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaIoTmpdir() * @since Java 1.2 */ public static final String JAVA_IO_TMPDIR = SystemProperties.getJavaIoTmpdir(); /** * The {@code java.library.path} System Property. List of paths to search when loading libraries. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaLibraryPath() * @since Java 1.2 */ public static final String JAVA_LIBRARY_PATH = SystemProperties.getJavaLibraryPath(); /** * The {@code java.runtime.name} System Property. Java Runtime Environment name. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaRuntimeName() * @since 2.0 * @since Java 1.3 */ public static final String JAVA_RUNTIME_NAME = SystemProperties.getJavaRuntimeName(); /** * The {@code java.runtime.version} System Property. Java Runtime Environment version. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaRuntimeVersion() * @since 2.0 * @since Java 1.3 */ public static final String JAVA_RUNTIME_VERSION = SystemProperties.getJavaRuntimeVersion(); /** * The {@code java.specification.name} System Property. Java Runtime Environment specification name. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaSpecificationName() * @since Java 1.2 */ public static final String JAVA_SPECIFICATION_NAME = SystemProperties.getJavaSpecificationName(); /** * The {@code java.specification.vendor} System Property. Java Runtime Environment specification vendor. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaSpecificationVendor() * @since Java 1.2 */ public static final String JAVA_SPECIFICATION_VENDOR = SystemProperties.getJavaSpecificationVendor(); /** * The {@code java.specification.version} System Property. Java Runtime Environment specification version. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaSpecificationVersion() * @since Java 1.3 */ public static final String JAVA_SPECIFICATION_VERSION = SystemProperties.getJavaSpecificationVersion(); private static final JavaVersion JAVA_SPECIFICATION_VERSION_AS_ENUM = JavaVersion.get(JAVA_SPECIFICATION_VERSION); /** * The {@code java.util.prefs.PreferencesFactory} System Property. A class name. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaUtilPrefsPreferencesFactory() * @since 2.1 * @since Java 1.4 */ public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY = SystemProperties.getJavaUtilPrefsPreferencesFactory(); /** * The {@code java.vendor} System Property. Java vendor-specific string. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVendor() * @since Java 1.1 */ public static final String JAVA_VENDOR = SystemProperties.getJavaVendor(); /** * The {@code java.vendor.url} System Property. Java vendor URL. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVendorUrl() * @since Java 1.1 */ public static final String JAVA_VENDOR_URL = SystemProperties.getJavaVendorUrl(); /** * The {@code java.version} System Property. Java version number. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVersion() * @since Java 1.1 */ public static final String JAVA_VERSION = SystemProperties.getJavaVersion(); /** * The {@code java.vm.info} System Property. Java Virtual Machine implementation info. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVmInfo() * @since 2.0 * @since Java 1.2 */ public static final String JAVA_VM_INFO = SystemProperties.getJavaVmInfo(); /** * The {@code java.vm.name} System Property. Java Virtual Machine implementation name. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVmName() * @since Java 1.2 */ public static final String JAVA_VM_NAME = SystemProperties.getJavaVmName(); /** * The {@code java.vm.specification.name} System Property. Java Virtual Machine specification name. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVmSpecificationName() * @since Java 1.2 */ public static final String JAVA_VM_SPECIFICATION_NAME = SystemProperties.getJavaVmSpecificationName(); /** * The {@code java.vm.specification.vendor} System Property. Java Virtual Machine specification vendor. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVmSpecificationVendor() * @since Java 1.2 */ public static final String JAVA_VM_SPECIFICATION_VENDOR = SystemProperties.getJavaVmSpecificationVendor(); /** * The {@code java.vm.specification.version} System Property. Java Virtual Machine specification version. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVmSpecificationVersion() * @since Java 1.2 */ public static final String JAVA_VM_SPECIFICATION_VERSION = SystemProperties.getJavaVmSpecificationVersion(); /** * The {@code java.vm.vendor} System Property. Java Virtual Machine implementation vendor. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVmVendor() * @since Java 1.2 */ public static final String JAVA_VM_VENDOR = SystemProperties.getJavaVmVendor(); /** * The {@code java.vm.version} System Property. Java Virtual Machine implementation version. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getJavaVmVersion() * @since Java 1.2 */ public static final String JAVA_VM_VERSION = SystemProperties.getJavaVmVersion(); /** * The {@code line.separator} System Property. Line separator ({@code "\n"} on UNIX). * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getLineSeparator() * @deprecated Use {@link System#lineSeparator()} instead, since it does not require a privilege check. * @since Java 1.1 */ @Deprecated public static final String LINE_SEPARATOR = SystemProperties.getLineSeparator(); /** * The {@code os.arch} System Property. Operating system architecture. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getOsArch() * @since Java 1.1 */ public static final String OS_ARCH = SystemProperties.getOsArch(); /** * The {@code os.name} System Property. Operating system name. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getOsName() * @since Java 1.1 */ public static final String OS_NAME = SystemProperties.getOsName(); /** * The {@code os.version} System Property. Operating system version. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getOsVersion() * @since Java 1.1 */ public static final String OS_VERSION = SystemProperties.getOsVersion(); /** * The {@code path.separator} System Property. Path separator ({@code ":"} on UNIX). * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getPathSeparator() * @deprecated Use {@link File#pathSeparator}, since it is guaranteed to be a * string containing a single character and it does not require a privilege check. * @since Java 1.1 */ @Deprecated public static final String PATH_SEPARATOR = SystemProperties.getPathSeparator(); /** * The {@code user.country} or {@code user.region} System Property. User's country code, such as {@code "GB"}. First * in Java version 1.2 as {@code user.region}. Renamed to {@code user.country} in 1.4 * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @since 2.0 * @since Java 1.2 */ public static final String USER_COUNTRY = SystemProperties.getProperty(SystemProperties.USER_COUNTRY, () -> SystemProperties.getProperty(SystemProperties.USER_REGION)); /** * The {@code user.dir} System Property. User's current working directory. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getUserDir() * @since Java 1.1 */ public static final String USER_DIR = SystemProperties.getUserDir(); /** * The {@code user.home} System Property. User's home directory. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getUserHome() * @since Java 1.1 */ public static final String USER_HOME = SystemProperties.getUserHome(); /** * The {@code user.language} System Property. User's language code, such as {@code "en"}. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getUserLanguage() * @since 2.0 * @since Java 1.2 */ public static final String USER_LANGUAGE = SystemProperties.getUserLanguage(); /** * The {@code user.name} System Property. User's account name. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getUserName() * @since Java 1.1 */ public static final String USER_NAME = SystemProperties.getUserName(); /** * The {@code user.timezone} System Property. For example: {@code "America/Los_Angeles"}. * *

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @see SystemProperties#getUserTimezone() * @since 2.1 */ public static final String USER_TIMEZONE = SystemProperties.getUserTimezone(); // Java version checks // ----------------------------------------------------------------------- // These MUST be declared after those above as they depend on the // values being set up /** * Is {@code true} if this is Java version 1.1 (also 1.1.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

*/ public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1"); /** * Is {@code true} if this is Java version 1.2 (also 1.2.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

*/ public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2"); /** * Is {@code true} if this is Java version 1.3 (also 1.3.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

*/ public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3"); /** * Is {@code true} if this is Java version 1.4 (also 1.4.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

*/ public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4"); /** * Is {@code true} if this is Java version 1.5 (also 1.5.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

*/ public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5"); /** * Is {@code true} if this is Java version 1.6 (also 1.6.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

*/ public static final boolean IS_JAVA_1_6 = getJavaVersionMatches("1.6"); /** * Is {@code true} if this is Java version 1.7 (also 1.7.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.0 */ public static final boolean IS_JAVA_1_7 = getJavaVersionMatches("1.7"); /** * Is {@code true} if this is Java version 1.8 (also 1.8.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.3.2 */ public static final boolean IS_JAVA_1_8 = getJavaVersionMatches("1.8"); /** * Is {@code true} if this is Java version 1.9 (also 1.9.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 * * @deprecated As of release 3.5, replaced by {@link #IS_JAVA_9} */ @Deprecated public static final boolean IS_JAVA_1_9 = getJavaVersionMatches("9"); /** * Is {@code true} if this is Java version 9 (also 9.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.5 */ public static final boolean IS_JAVA_9 = getJavaVersionMatches("9"); /** * Is {@code true} if this is Java version 10 (also 10.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.7 */ public static final boolean IS_JAVA_10 = getJavaVersionMatches("10"); /** * Is {@code true} if this is Java version 11 (also 11.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.8 */ public static final boolean IS_JAVA_11 = getJavaVersionMatches("11"); /** * Is {@code true} if this is Java version 12 (also 12.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.9 */ public static final boolean IS_JAVA_12 = getJavaVersionMatches("12"); /** * Is {@code true} if this is Java version 13 (also 13.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.9 */ public static final boolean IS_JAVA_13 = getJavaVersionMatches("13"); /** * Is {@code true} if this is Java version 14 (also 14.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.10 */ public static final boolean IS_JAVA_14 = getJavaVersionMatches("14"); /** * Is {@code true} if this is Java version 15 (also 15.x versions). * *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.10 */ public static final boolean IS_JAVA_15 = getJavaVersionMatches("15"); /** * Is {@code true} if this is Java version 16 (also 16.x versions). *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.13.0 */ public static final boolean IS_JAVA_16 = getJavaVersionMatches("16"); /** * Is {@code true} if this is Java version 17 (also 17.x versions). *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.13.0 */ public static final boolean IS_JAVA_17 = getJavaVersionMatches("17"); /** * Is {@code true} if this is Java version 18 (also 18.x versions). *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.13.0 */ public static final boolean IS_JAVA_18 = getJavaVersionMatches("18"); /** * Is {@code true} if this is Java version 19 (also 19.x versions). *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.13.0 */ public static final boolean IS_JAVA_19 = getJavaVersionMatches("19"); /** * Is {@code true} if this is Java version 20 (also 20.x versions). *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.13.0 */ public static final boolean IS_JAVA_20 = getJavaVersionMatches("20"); /** * Is {@code true} if this is Java version 21 (also 21.x versions). *

* The field will return {@code false} if {@link #JAVA_VERSION} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.13.0 */ public static final boolean IS_JAVA_21 = getJavaVersionMatches("21"); // Operating system checks // ----------------------------------------------------------------------- // These MUST be declared after those above as they depend on the // values being set up // Please advise [email protected] if you want another added // or a mistake corrected /** * Is {@code true} if this is AIX. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_AIX = getOsMatchesName("AIX"); /** * Is {@code true} if this is HP-UX. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_HP_UX = getOsMatchesName("HP-UX"); /** * Is {@code true} if this is IBM OS/400. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.3 */ public static final boolean IS_OS_400 = getOsMatchesName("OS/400"); /** * Is {@code true} if this is Irix. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_IRIX = getOsMatchesName("Irix"); /** * Is {@code true} if this is Linux. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_LINUX = getOsMatchesName("Linux") || getOsMatchesName("LINUX"); /** * Is {@code true} if this is Mac. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_MAC = getOsMatchesName("Mac"); /** * Is {@code true} if this is Mac. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_MAC_OSX = getOsMatchesName("Mac OS X"); /** * Is {@code true} if this is Mac OS X Cheetah. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_CHEETAH = getOsMatches("Mac OS X", "10.0"); /** * Is {@code true} if this is Mac OS X Puma. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_PUMA = getOsMatches("Mac OS X", "10.1"); /** * Is {@code true} if this is Mac OS X Jaguar. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_JAGUAR = getOsMatches("Mac OS X", "10.2"); /** * Is {@code true} if this is Mac OS X Panther. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_PANTHER = getOsMatches("Mac OS X", "10.3"); /** * Is {@code true} if this is Mac OS X Tiger. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_TIGER = getOsMatches("Mac OS X", "10.4"); /** * Is {@code true} if this is Mac OS X Leopard. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_LEOPARD = getOsMatches("Mac OS X", "10.5"); /** * Is {@code true} if this is Mac OS X Snow Leopard. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_SNOW_LEOPARD = getOsMatches("Mac OS X", "10.6"); /** * Is {@code true} if this is Mac OS X Lion. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_LION = getOsMatches("Mac OS X", "10.7"); /** * Is {@code true} if this is Mac OS X Mountain Lion. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_MOUNTAIN_LION = getOsMatches("Mac OS X", "10.8"); /** * Is {@code true} if this is Mac OS X Mavericks. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_MAVERICKS = getOsMatches("Mac OS X", "10.9"); /** * Is {@code true} if this is Mac OS X Yosemite. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_MAC_OSX_YOSEMITE = getOsMatches("Mac OS X", "10.10"); /** * Is {@code true} if this is Mac OS X El Capitan. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.5 */ public static final boolean IS_OS_MAC_OSX_EL_CAPITAN = getOsMatches("Mac OS X", "10.11"); /** * Is {@code true} if this is Mac OS X Sierra. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.12.0 */ public static final boolean IS_OS_MAC_OSX_SIERRA = getOsMatches("Mac OS X", "10.12"); /** * Is {@code true} if this is Mac OS X High Sierra. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.12.0 */ public static final boolean IS_OS_MAC_OSX_HIGH_SIERRA = getOsMatches("Mac OS X", "10.13"); /** * Is {@code true} if this is Mac OS X Mojave. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.12.0 */ public static final boolean IS_OS_MAC_OSX_MOJAVE = getOsMatches("Mac OS X", "10.14"); /** * Is {@code true} if this is Mac OS X Catalina. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.12.0 */ public static final boolean IS_OS_MAC_OSX_CATALINA = getOsMatches("Mac OS X", "10.15"); /** * Is {@code true} if this is Mac OS X Big Sur. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.12.0 */ public static final boolean IS_OS_MAC_OSX_BIG_SUR = getOsMatches("Mac OS X", "11"); /** * Is {@code true} if this is Mac OS X Monterey. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* @since 3.13.0 */ public static final boolean IS_OS_MAC_OSX_MONTEREY = getOsMatches("Mac OS X", "12"); /** * Is {@code true} if this is Mac OS X Ventura. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* @since 3.13.0 */ public static final boolean IS_OS_MAC_OSX_VENTURA = getOsMatches("Mac OS X", "13"); /** * Is {@code true} if this is FreeBSD. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.1 */ public static final boolean IS_OS_FREE_BSD = getOsMatchesName("FreeBSD"); /** * Is {@code true} if this is OpenBSD. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.1 */ public static final boolean IS_OS_OPEN_BSD = getOsMatchesName("OpenBSD"); /** * Is {@code true} if this is NetBSD. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.1 */ public static final boolean IS_OS_NET_BSD = getOsMatchesName("NetBSD"); /** * Is {@code true} if this is OS/2. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_OS2 = getOsMatchesName("OS/2"); /** * Is {@code true} if this is Solaris. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_SOLARIS = getOsMatchesName("Solaris"); /** * Is {@code true} if this is SunOS. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_SUN_OS = getOsMatchesName("SunOS"); /** * Is {@code true} if this is a UNIX like system, as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.1 */ public static final boolean IS_OS_UNIX = IS_OS_AIX || IS_OS_HP_UX || IS_OS_IRIX || IS_OS_LINUX || IS_OS_MAC_OSX || IS_OS_SOLARIS || IS_OS_SUN_OS || IS_OS_FREE_BSD || IS_OS_OPEN_BSD || IS_OS_NET_BSD; /** * Is {@code true} if this is Windows. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_WINDOWS = getOsMatchesName(OS_NAME_WINDOWS_PREFIX); /** * Is {@code true} if this is Windows 2000. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_2000 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 2000"); /** * Is {@code true} if this is Windows 2003. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.1 */ public static final boolean IS_OS_WINDOWS_2003 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 2003"); /** * Is {@code true} if this is Windows Server 2008. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.1 */ public static final boolean IS_OS_WINDOWS_2008 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " Server 2008"); /** * Is {@code true} if this is Windows Server 2012. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.4 */ public static final boolean IS_OS_WINDOWS_2012 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " Server 2012"); /** * Is {@code true} if this is Windows 95. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_95 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 95"); /** * Is {@code true} if this is Windows 98. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_98 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 98"); /** * Is {@code true} if this is Windows ME. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_ME = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " Me"); /** * Is {@code true} if this is Windows NT. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_NT = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " NT"); /** * Is {@code true} if this is Windows XP. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.0 */ public static final boolean IS_OS_WINDOWS_XP = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " XP"); /** * Is {@code true} if this is Windows Vista. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 2.4 */ public static final boolean IS_OS_WINDOWS_VISTA = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " Vista"); /** * Is {@code true} if this is Windows 7. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.0 */ public static final boolean IS_OS_WINDOWS_7 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 7"); /** * Is {@code true} if this is Windows 8. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.2 */ public static final boolean IS_OS_WINDOWS_8 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 8"); /** * Is {@code true} if this is Windows 10. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.5 */ public static final boolean IS_OS_WINDOWS_10 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 10"); /** * Is {@code true} if this is Windows 11. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* OpenJDK fixed the return value for {@code os.name} on Windows 11 to versions 8, 11, and 17: *

*
    *
  • Affects Java versions 7u321, 8u311, 11.0.13-oracle, 17.0.1: https://bugs.openjdk.org/browse/JDK-8274737
  • *
  • Fixed in OpenJDK commit https://github.com/openjdk/jdk/commit/97ea9dd2f24f9f1fb9b9345a4202a825ee28e014
  • *
*

* This value is initialized when the class is loaded. *

* * @since 3.13.0 */ public static final boolean IS_OS_WINDOWS_11 = getOsMatchesName(OS_NAME_WINDOWS_PREFIX + " 11"); /** * Is {@code true} if this is z/OS. * *

* The field will return {@code false} if {@code OS_NAME} is {@code null}. *

*

* This value is initialized when the class is loaded. *

* * @since 3.5 */ // Values on a z/OS system I tested (Gary Gregory - 2016-03-12) // os.arch = s390x // os.encoding = ISO8859_1 // os.name = z/OS // os.version = 02.02.00 public static final boolean IS_OS_ZOS = getOsMatchesName("z/OS"); /** * The System property key for the user home directory. */ public static final String USER_HOME_KEY = "user.home"; /** * The System property key for the user name. * * @deprecated Use {@link SystemProperties#USER_NAME}. */ @Deprecated public static final String USER_NAME_KEY = "user.name"; /** * The System property key for the user directory. * * @deprecated Use {@link SystemProperties#USER_DIR}. */ @Deprecated public static final String USER_DIR_KEY = "user.dir"; /** * The System property key for the Java IO temporary directory. * * @deprecated Use {@link SystemProperties#JAVA_IO_TMPDIR}. */ @Deprecated public static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir"; /** * The System property key for the Java home directory. * * @deprecated Use {@link SystemProperties#JAVA_HOME}. */ @Deprecated public static final String JAVA_HOME_KEY = "java.home"; /** * The {@code awt.toolkit} System Property. * *

* Holds a class name, on Windows XP this is {@code sun.awt.windows.WToolkit}. *

*

* On platforms without a GUI, this value is {@code null}. *

*

* Defaults to {@code null} if the runtime does not have security access to read this property or the property does * not exist. *

*

* This value is initialized when the class is loaded. If {@link System#setProperty(String,String)} or * {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value will be out of * sync with that System property. *

* * @since 2.1 * @see SystemProperties#getAwtToolkit() */ public static final String AWT_TOOLKIT = SystemProperties.getAwtToolkit(); /** * Gets an environment variable, defaulting to {@code defaultValue} if the variable cannot be read. * *

* If a {@link SecurityException} is caught, the return value is {@code defaultValue} and a message is written to * {@code System.err}. *

* * @param name * the environment variable name * @param defaultValue * the default value * @return the environment variable value or {@code defaultValue} if a security problem occurs * @since 3.8 */ public static String getEnvironmentVariable(final String name, final String defaultValue) { try { final String value = System.getenv(name); return value == null ? defaultValue : value; } catch (final SecurityException ex) { // we are not allowed to look at this property // System.err.println("Caught a SecurityException reading the environment variable '" + name + "'."); return defaultValue; } } /** * Gets the host name from an environment variable * (COMPUTERNAME on Windows, HOSTNAME elsewhere). * *

* If you want to know what the network stack says is the host name, you should use {@code InetAddress.getLocalHost().getHostName()}. *

* * @return the host name. Will be {@code null} if the environment variable is not defined. * @since 3.6 */ public static String getHostName() { return IS_OS_WINDOWS ? System.getenv("COMPUTERNAME") : System.getenv("HOSTNAME"); } /** * Gets the current Java home directory as a {@link File}. * * @return a directory * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} method doesn't allow * access to the specified system property. * @see SystemProperties#getJavaHome() * @since 2.1 */ public static File getJavaHome() { return new File(SystemProperties.getJavaHome()); } /** * Gets the current Java IO temporary directory as a {@link File}. * * @return a directory * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} method doesn't allow * access to the specified system property. * @see SystemProperties#getJavaIoTmpdir() * @since 2.1 */ public static File getJavaIoTmpDir() { return new File(SystemProperties.getJavaIoTmpdir()); } /** * Decides if the Java version matches. * * @param versionPrefix the prefix for the java version * @return true if matches, or false if not or can't determine */ private static boolean getJavaVersionMatches(final String versionPrefix) { return isJavaVersionMatch(JAVA_SPECIFICATION_VERSION, versionPrefix); } /** * Decides if the operating system matches. * * @param osNamePrefix the prefix for the OS name * @param osVersionPrefix the prefix for the version * @return true if matches, or false if not or can't determine */ private static boolean getOsMatches(final String osNamePrefix, final String osVersionPrefix) { return isOSMatch(OS_NAME, OS_VERSION, osNamePrefix, osVersionPrefix); } /** * Decides if the operating system matches. * * @param osNamePrefix the prefix for the OS name * @return true if matches, or false if not or can't determine */ private static boolean getOsMatchesName(final String osNamePrefix) { return isOSNameMatch(OS_NAME, osNamePrefix); } /** * Gets the current user directory as a {@link File}. * * @return a directory * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} method doesn't allow * access to the specified system property. * @see SystemProperties#getUserDir() * @since 2.1 */ public static File getUserDir() { return new File(SystemProperties.getUserDir()); } /** * Gets the current user home directory as a {@link File}. * * @return a directory * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} method doesn't allow * access to the specified system property. * @see SystemProperties#getUserHome() * @since 2.1 */ public static File getUserHome() { return new File(SystemProperties.getUserHome()); } /** * Gets the current user name. * * @return a name * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} method doesn't allow * access to the specified system property. * @see SystemProperties#getUserName() * @since 3.10 * @deprecated Use {@link SystemProperties#getUserName()}. */ @Deprecated public static String getUserName() { return SystemProperties.getUserName(); } /** * Gets the user name. * * @param defaultValue A default value. * @return a name * @throws SecurityException if a security manager exists and its {@code checkPropertyAccess} method doesn't allow * access to the specified system property. * @see SystemProperties#getUserName() * @since 3.10 */ public static String getUserName(final String defaultValue) { return System.getProperty(SystemProperties.USER_NAME, defaultValue); } /** * Returns whether the {@link #JAVA_AWT_HEADLESS} value is {@code true}. * * @return {@code true} if {@code JAVA_AWT_HEADLESS} is {@code "true"}, {@code false} otherwise. * @see #JAVA_AWT_HEADLESS * @since 2.1 * @since Java 1.4 */ public static boolean isJavaAwtHeadless() { return Boolean.TRUE.toString().equals(JAVA_AWT_HEADLESS); } /** * Is the Java version at least the requested version. * * @param requiredVersion the required version, for example 1.31f * @return {@code true} if the actual version is equal or greater than the required version */ public static boolean isJavaVersionAtLeast(final JavaVersion requiredVersion) { return JAVA_SPECIFICATION_VERSION_AS_ENUM.atLeast(requiredVersion); } /** * Is the Java version at most the requested version. * *

* Example input: *

* * @param requiredVersion the required version, for example 1.31f * @return {@code true} if the actual version is equal or less than the required version * @since 3.9 */ public static boolean isJavaVersionAtMost(final JavaVersion requiredVersion) { return JAVA_SPECIFICATION_VERSION_AS_ENUM.atMost(requiredVersion); } /** * Decides if the Java version matches. * *

* This method is package private instead of private to support unit test invocation. *

* * @param version the actual Java version * @param versionPrefix the prefix for the expected Java version * @return true if matches, or false if not or can't determine */ static boolean isJavaVersionMatch(final String version, final String versionPrefix) { if (version == null) { return false; } return version.startsWith(versionPrefix); } /** * Decides if the operating system matches. *

* This method is package private instead of private to support unit test invocation. *

* * @param osName the actual OS name * @param osVersion the actual OS version * @param osNamePrefix the prefix for the expected OS name * @param osVersionPrefix the prefix for the expected OS version * @return true if matches, or false if not or can't determine */ static boolean isOSMatch(final String osName, final String osVersion, final String osNamePrefix, final String osVersionPrefix) { if (osName == null || osVersion == null) { return false; } return isOSNameMatch(osName, osNamePrefix) && isOSVersionMatch(osVersion, osVersionPrefix); } /** * Decides if the operating system matches. *

* This method is package private instead of private to support unit test invocation. *

* * @param osName the actual OS name * @param osNamePrefix the prefix for the expected OS name * @return true if matches, or false if not or can't determine */ static boolean isOSNameMatch(final String osName, final String osNamePrefix) { if (osName == null) { return false; } return osName.startsWith(osNamePrefix); } /** * Decides if the operating system version matches. *

* This method is package private instead of private to support unit test invocation. *

* * @param osVersion the actual OS version * @param osVersionPrefix the prefix for the expected OS version * @return true if matches, or false if not or can't determine */ static boolean isOSVersionMatch(final String osVersion, final String osVersionPrefix) { if (StringUtils.isEmpty(osVersion)) { return false; } // Compare parts of the version string instead of using String.startsWith(String) because otherwise // osVersionPrefix 10.1 would also match osVersion 10.10 final String[] versionPrefixParts = osVersionPrefix.split("\\."); final String[] versionParts = osVersion.split("\\."); for (int i = 0; i < Math.min(versionPrefixParts.length, versionParts.length); i++) { if (!versionPrefixParts[i].equals(versionParts[i])) { return false; } } return true; } /** * SystemUtils instances should NOT be constructed in standard programming. Instead, the class should be used as * {@code SystemUtils.FILE_SEPARATOR}. * *

* This constructor is public to permit tools that require a JavaBean instance to operate. *

*/ public SystemUtils() { } }




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