◆线程分为用户线程和守护线程
◆虚拟机必须确保用户线程执行完毕
◆虚拟机不用等待守护线程执行完毕
◆如,后台记录操作日志,监控内存,垃圾回收等待. . .
package state; // 上帝守护你 public class TestDaemon { public static void main(String[] args) { God god = new God(); You you = new You(); Thread thread = new Thread(god); thread.setDaemon(true);//默认是false表示是用户线程,正常的线程都是用户线程 thread.start();//守护线程启动 new Thread(you).start();//用户线程启动 } } class God implements Runnable{ @Override public void run() { while (true){ System.out.println("God bless you!"); } } } class You implements Runnable{ @Override public void run() { for (int i = 0; i < 36500; i++) { System.out.println("You live happily all your life."); } System.out.println("========Goodbye!World!========="); } }