Java中判断操作系统

/**
 * java version "1.6.0_11"
 * Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
 * Java HotSpot(TM) Client VM (build 11.0-b16, mixed mode, sharing)
 */

import java.net.*; 

class Path 
{
	public static void main(String[] args) 
	{
		boolean isLinux = true; 
		URL resource = Path.class.getResource("Path.class"); 
		String classPath = resource.getPath(); 	
		String className = Path.class.getName().replace(".", "/") + ".class"; 
		String classesPath = classPath.substring(0, classPath.indexOf(className)); 
		if( System.getProperty("os.name").toUpperCase().indexOf("WINDOWS") != -1 && 
				classesPath.startsWith("/") )
		{
			classesPath = classesPath.substring(1); 
			isLinux = false;
		}

		System.out.println( isLinux ? "LINUX" : "WINDOWS" ); 
		System.out.println( classesPath );
	}
}