com.alibaba.nacos.common.utils.NumberUtils Maven / Gradle / Ivy
/*
* Copyright 1999-2020 Alibaba Group Holding Ltd.
*
* Licensed 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 com.alibaba.nacos.common.utils;
/**
* Number utils.
* @author zzq
*/
public class NumberUtils {
private NumberUtils() {
}
/**
* Convert a String to an int, returning
* zero if the conversion fails.
*
* @param str the string to convert, may be null
* @return the int represented by the string, or zero if
* conversion fails
*/
public static int toInt(String str) {
return toInt(str, 0);
}
/**
* Convert a String to an int, returning a
* default value if the conversion fails.
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the int represented by the string, or the default if conversion fails
*/
public static int toInt(String str, int defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return Integer.parseInt(str);
} catch (NumberFormatException nfe) {
return defaultValue;
}
}
/**
* Convert a String to a long, returning a
* default value if the conversion fails.
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the long represented by the string, or the default if conversion fails
*/
public static long toLong(String str, long defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return Long.parseLong(str);
} catch (NumberFormatException nfe) {
return defaultValue;
}
}
/**
* Convert a String to a double, returning a
* default value if the conversion fails.
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the double represented by the string, or defaultValue
* if conversion fails
*/
public static double toDouble(String str, double defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return Double.parseDouble(str);
} catch (NumberFormatException nfe) {
return defaultValue;
}
}
/**
* Checks whether the String contains only
* digit characters.
*
* @param str the String to check
* @return true if str contains only unicode numeric
*/
public static boolean isDigits(String str) {
if (StringUtils.isEmpty(str)) {
return false;
}
for (int i = 0; i < str.length(); i++) {
if (!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
/**
* Convert a String to a float, returning
* 0.0f if the conversion fails.
*
* @param str the string to convert, may be null
* @return the float represented by the string, or 0.0f
* if conversion fails
*/
public static float toFloat(final String str) {
return toFloat(str, 0.0f);
}
/**
* Convert a String to a float, returning a
* default value if the conversion fails.
*
* @param str the string to convert, may be null
* @param defaultValue the default value
* @return the float represented by the string, or defaultValue
* if conversion fails
*/
public static float toFloat(final String str, final float defaultValue) {
if (str == null) {
return defaultValue;
}
try {
return Float.parseFloat(str);
} catch (final NumberFormatException nfe) {
return defaultValue;
}
}
}