Java9 编程参考官方大全（第10版）第18章：探究Java.long:18.7.3环境属性

此程序展示了如何使用Java的System.getProperty()方法打印出各种系统属性，包括文件分隔符、Java安装路径、临时目录、操作系统名称、用户目录等，揭示了Java运行时环境的详细信息。

自己拓展了一下该程序，把书中的环境属性全打印出来了，这个简单，我会做。


public class ShowAll {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		//java.xxxx
		System.out.println("file.separator is:"+System.getProperty("file.separator"));
		System.out.println("java.class.path is:"+System.getProperty("java.class.path"));
		System.out.println("java.class.version is:"+System.getProperty("java.class.version"));
		System.out.println("java.compiler is:"+System.getProperty("java.compiler"));
		System.out.println("java.home is:"+System.getProperty("java.home"));
		System.out.println("java.io.tmpdir is:"+System.getProperty("java.io.tmpdir"));
		System.out.println("java.library.path is:"+System.getProperty("java.library.path"));
		System.out.println("java.specification.name is:"+System.getProperty("java.specification.name"));
		System.out.println("java.specification.vendor is:"+System.getProperty("java.specification.vendor"));
		System.out.println("java.specification.version is:"+System.getProperty("java.specification.version"));
		System.out.println("java.vendor is:"+System.getProperty("java.vendor"));
		System.out.println("java.vendor.url is:"+System.getProperty("java.vendor.url"));
		System.out.println("java.version is:"+System.getProperty("java.version"));
		System.out.println("java.vm.name is:"+System.getProperty("java.vm.name"));
		System.out.println("java.vm.specification.name is:"+System.getProperty("java.vm.specification.name"));
		System.out.println("java.vm.specification.vendor is:"+System.getProperty("java.vm.specification.vendor"));
		System.out.println("java.vm.specification.version is:"+System.getProperty("java.vm.specification.version"));
		System.out.println("java.vm.vendor is:"+System.getProperty("java.vm.vendor"));
		System.out.println("java.vm.version is:"+System.getProperty("java.vm.version"));
		System.out.println("line.separator is:"+System.getProperty("line.separator"));
		//os.xxxx
		System.out.println("os.arch is:"+System.getProperty("os.arch"));
		System.out.println("os.name is:"+System.getProperty("os.name"));
		System.out.println("os.version is:"+System.getProperty("os.version"));
		System.out.println("path.separator is:"+System.getProperty("path.separator"));
		//user.xxx
		System.out.println("user.dir is:"+System.getProperty("user.dir"));
		System.out.println("user.home is:"+System.getProperty("user.home"));
		System.out.println("user.name is:"+System.getProperty("user.name"));
		

	}

}