线程状态观测

1. NEW：尚未启动的线程处于此状态
2. RUNNABLE：执行的线程处于此状态
3. BLOCKED：被阻塞等待时锁定的线程处于此状态
4. WAITING：正在等待另一个线程执行特定的线程处在此状态
5. TIMED_WAITNG:正在等待另一个线程执行动作达到指定等待时间的线程处于此状态
6. TERMINATED：已退出的线程处于此状态

package StateThread;
//观察测试线程的状态
public class TestState {
    public static void main(String[] args) throws InterruptedException {
        Thread thread = new Thread(()->{//线程体
            for (int i = 0; i < 5; i++) {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("开始运行");
        });
        //观察状态
        Thread.State state = thread.getState();
        System.out.println(state);//NEW
        //观察启动后
        thread.start();//启动线程
        state = thread.getState();
        System.out.println(state);//Run
        while (state != Thread.State.TERMINATED){//只要线程不停止，就一直输出状态
            Thread.sleep(10);
            state = thread.getState();//更新线程状态
            System.out.println(state);//输出状态
        }
    }
}