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new新生，start就绪，然后运行，运行有两种结果，阻塞或者运行结束，线程不能启动两次，死亡之后的线程无法再次启动

线程的5个状态

观测线程状态的代码如下：

package duoxiancheng;//观察测试线程的状态public class TestState {
       public static void main(String[] args) throws InterruptedException {
           Thread thread=new Thread(()->{
               for (int i = 0; i < 5; i++) {
                   try {
                       Thread.sleep(1000);                } catch (InterruptedException e) {
                       System.out.println("//");                }            }        });        //观察线程状态        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);//打印出运行状态runnable        while (state!=Thread.State.TERMINATED){
   //只要线程不终止，就一直输出状态            Thread.sleep(100);            state=thread.getState();//更新线程状态            System.out.println(state);//输出状态        }    }}

运行结果如下所示：

NEW RUNNABLE TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TIMED_WAITING TERMINATED

Process finished with exit code 0

一个线程只能启动一次，不能再线程死亡之后再次启动

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