状态图

image.png

ready to run 就绪态，可以抢占资源的线程
blocked：阻塞，被I/O或者进入同步代码块而阻塞
sleep：超时等待，当一定时间过了之后会进入就绪态
waiting：等待，如果不被notify唤醒将永远等待

sleep

public class NewThread implements Runnable{

    
    @Override
    public void run() {
        // TODO Auto-generated method stub
        while (true) {
            System.out.println("自定义的线程执行");
            
            try {
//              sleep线程超时等待100ms，过了时间后线程进入就绪态
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        Thread thread = new Thread(new NewThread());
        
        thread.start();
        while (true) {
            System.out.println("主线程执行 ");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
}

wait

public class NewThread2 implements Runnable{

    @Override
    public synchronized void run() {
        // TODO Auto-generated method stub
        while (true) {
            
            try {
//              wait线程进入等待，直到notifyall才能进入就绪态

                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println("自定义的线程执行");
        }
    }

    public static void main(String[] args) {
        NewThread2 n = new NewThread2();
        Thread thread = new Thread(n);
        thread.start();
        while (true) {
            synchronized (n) {
                System.out.println("主线程执行");
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                n.notifyAll();
            }
        }
        
    }
}