一旦进入死亡状态就不能再一次被启动
public class TestState { public static void main(String[] args) { Thread thread = new Thread(()->{ for (int i = 0; i < 5; i++) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println("-----------"); }); //观察状态 Thread.State state = thread.getState(); System.out.println(state);// //观察启动后 thread.start();//线程启动 state = thread.getState(); System.out.println(state); while (state != Thread.State.TERMINATED){ state = thread.getState();//更新线程状态 System.out.println(state);//输出状态 } }}
…
线程方法
setPriority(int newPriority) //更改线程优先级
线程休眠
static void sleep(long millis)
//sleep(时间)指定当前线程阻塞毫秒数
//sleep存在异常InterruptedException
//sleep时间达到后线程进行就绪状态
//sleep可以模拟网络延时（放大问题的发生性），倒计时
public class TenDown { public static void main(String[] args) { try { tenDown(); } catch (InterruptedException e) { e.printStackTrace(); } } public static void tenDown() throws InterruptedException { int num=10; while(true){ Thread.sleep(1000); System.out.println(num--); if(num<=0){ break; } } }}
//打印系统时间
//打印系统时间public class TenDown1 { public static void main(String[] args) { //打印当前时间 Date startTime = new Date(System.currentTimeMillis());//获取当前系统时间 while(true){ try { Thread.sleep(1000); System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime)); startTime = new Date(System.currentTimeMillis());//更新时间 } catch (InterruptedException e) { e.printStackTrace(); } } } public static void tenDown() throws InterruptedException { int num=10; while(true){ Thread.sleep(1000); System.out.println(num--); if(num<=0){ break; } } }}
//每个对象都有一个锁，sleep不会释放锁
等待该线程终止
void join()
public class TestJoin implements Runnable{ @Override public void run() { for (int i = 0; i < 1000; i++) { System.out.println("线程mvp来了"+i); } } public static void main(String[] args) throws InterruptedException { //启动我们的线程 TestJoin testJoin =new TestJoin(); Thread thread = new Thread(testJoin); thread.start(); //主线程 for (int i = 0; i < 500; i++) { if(i==200){ thread.join();//插队 } System.out.println("main"+i); } }}
停止当前，执行其他
static void yield()
//礼让不一定成功public class TestYield { public static void main(String[] args) { MyYield myYield= new MyYield(); new Thread(myYield,"a卡卡西").start(); new Thread(myYield,"b小李").start(); }}class MyYield implements Runnable{ @Override public void run() { System.out.println(Thread.currentThread().getName()+"线程开始执行"); Thread.yield();//礼让 System.out.println(Thread.currentThread().getName()+"线程停止-———="); }}
*使用标志位停止线程
//使用标志位停止线程public class ThreadStop implements Runnable { //设置标志位 private boolean flag=true; //重写run方法 @Override public void run(){ int i=0; while(flag){ System.out.println("run --Thread ---"+i++); } } public void stop(){ this.flag = false; } public static void main(String[] args) { ThreadStop threadstop = new ThreadStop(); new Thread(threadstop).start(); // for (int i = 0; i < 1000; i++) { System.out.println("main "+i); if(i==900){ //调用stop方法 threadstop.stop(); System.out.println("线程 停止"); } } }}
- 中断线程 ```java void interrupt() ``` - 查看线程状态 ```java boolean isAlive() ```