getsysprop.java

java应用开发详解

import java.security.*;

class getSysProp
{
    public static void main(String[] args) 
    {
        String s;
        try 
        {
            //默认返回字串为not specified
            //得到系统名称
            s = System.getProperty("os.name", "not specified");
            System.out.println("  The name of your operating system is: " + s);

       	    //得到java虚拟机版本号
            s = System.getProperty("java.version", "not specified");
            System.out.println("  The version of the JVM you are running is: " + s);

	    //得到用户路径
            s = System.getProperty("user.home", "not specified");
            System.out.println("  Your user home directory is: " + s);

	    //得到java_home
            s = System.getProperty("java.home", "not specified");
            System.out.println("  Your JRE installation directory is: " + s);


	} 
	catch (Exception e) 
	{
	    e.printStackTrace();
        }

    }

}