Java tutorial
//package com.java2s; /* * Copyright (c) 2002 and later by MH Software-Entwicklung. All Rights Reserved. * * JTattoo is multiple licensed. If your are an open source developer you can use * it under the terms and conditions of the GNU General Public License version 2.0 * or later as published by the Free Software Foundation. * * see: gpl-2.0.txt * * If you pay for a license you will become a registered user who could use the * software under the terms and conditions of the GNU Lesser General Public License * version 2.0 or later with classpath exception as published by the Free Software * Foundation. * * see: lgpl-2.0.txt * see: classpath-exception.txt * * Registered users could also use JTattoo under the terms and conditions of the * Apache License, Version 2.0 as published by the Apache Software Foundation. * * see: APACHE-LICENSE-2.0.txt */ public class Main { private static Double javaVersion = null; public static double getJavaVersion() { if (javaVersion == null) { try { String ver = System.getProperties().getProperty("java.version"); String version = ""; boolean firstPoint = true; for (int i = 0; i < ver.length(); i++) { if (ver.charAt(i) == '.') { if (firstPoint) { version += ver.charAt(i); } firstPoint = false; } else if (Character.isDigit(ver.charAt(i))) { version += ver.charAt(i); } } javaVersion = new Double(version); } catch (Exception ex) { javaVersion = 1.3; } } return javaVersion; } }