net.sf.jsignpdf.JavaVersion Maven / Gradle / Ivy

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/*
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (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.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * The Original Code is 'JSignPdf, a free application for PDF signing'.
 * 
 * The Initial Developer of the Original Code is Josef Cacek.
 * Portions created by Josef Cacek are Copyright (C) Josef Cacek. All Rights Reserved.
 * 
 * Contributor(s): Josef Cacek.
 * 
 * Alternatively, the contents of this file may be used under the terms
 * of the GNU Lesser General Public License, version 2.1 (the  "LGPL License"), in which case the
 * provisions of LGPL License are applicable instead of those
 * above. If you wish to allow use of your version of this file only
 * under the terms of the LGPL License and not to allow others to use
 * your version of this file under the MPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the LGPL License. If you do not delete
 * the provisions above, a recipient may use your version of this file
 * under either the MPL or the LGPL License.
 */
package net.sf.jsignpdf;

/**
 * Prints major Java version.
 * 
 * @author Josef Cacek
 */
public class JavaVersion {

    public static void main(String[] args) {
        System.out.println(getJavaMajorVersion());
    }

    public static int getJavaMajorVersion() {
        Class rtVersionCl;

        try {
            rtVersionCl = Class.forName("java.lang.Runtime$Version");
        } catch (ClassNotFoundException e) {
            return 8;
        }

        try {
            Object versionObj = Runtime.class.getDeclaredMethod("version").invoke(Runtime.getRuntime());
            return (Integer) rtVersionCl.getDeclaredMethod("major").invoke(versionObj);
        } catch (Exception e) {
            return 8;
        }
    }
}