JavaEE(系列4) -- 多线程(线程的状态)

news2024/10/7 12:18:48

观察线程的所有状态

1. new状态

2. TERMINATED 状态

3. RUNNABLE 就绪状态,运行状态

4. TIMED_WAITNG 休眠状态

5. BLOCKED 表示等待锁出现的状态

6. WAITING 使用wait方法出现的状态

观察线程的所有状态

线程的状态是一个枚举类型

public class test2 {
        public static void main(String[] args) {
            for (Thread.State state : Thread.State.values()) {
                System.out.println(state);
        }
    }
}

* 1.NEW 系统的线程还没创建,只是有一个线程的对象

* 2.TERMINATED(terminated) 线程已经结束但是线程对象还在.

* 3.RUNNABLE(runnable) 就绪状态:1.正在CPU上进行运行2.准备好随时可以去CPU上去运行.

* 4.TIME_WAITING(time_waiting) 程序正在休眠状态

* 5.BLOCKED(blocked) 表示等待锁出现的状态

* 6. WAITING(waiting) 使用wait方法出现的状态

1. new状态

package threading;
 
public class ThreadDemo9 {
    public static void main(String[] args) {
        Thread t=new Thread(()->{
            System.out.println("hello t");
        });
        System.out.println(t.getState());
        t.start();
    }
}

2. TERMINATED 状态

package threading;
 
public class ThreadDemo9 {
    public static void main(String[] args)throws InterruptedException {
        Thread t=new Thread(()->{
            System.out.println("hello t");
        });
        System.out.println(t.getState());
        t.start();
        Thread.sleep(2000);
        System.out.println(t.getState());
    }
}

系统中的线程已经执行完了，Thread对象还在.

3. RUNNABLE 就绪状态,运行状态

细分为两种状态.

1.正在CPU上进行运行 (Running)

2.住备好随时可以去CPU上进行运行 (Ready)

package threading;
 
public class ThreadDemo9 {
    public static void main(String[] args)throws InterruptedException {
        Thread t=new Thread(()->{
            while (true){
               // System.out.println("hello t");
            }
 
        });
        t.start();
        Thread.sleep(2000);
        System.out.println(t.getState());
    }
}

4. TIMED_WAITNG 休眠状态

指定时间等待.sleep方法。

package threading;
 
public class ThreadDemo9 {
    public static void main(String[] args)throws InterruptedException {
        Thread t=new Thread(()->{
            while (true){
                try {
                    Thread.sleep(1000);
                }catch (InterruptedException e){
                    e.printStackTrace();
                }
            }
        });
        t.start();
        Thread.sleep(2000);
        System.out.println(t.getState());
    }
}