多线程日记（17.5.4）

Posted 2020-09-16

 

1.线程的等待与唤醒wait（）和notify（）；

public class Test{
    public static void main(String[]args){
        Thread thread1=new NewThread("t1");
        synchronized(thread1){
            System.out.println(Thread.currentThread().getName()+" is running");
            thread1.start();
            System.out.println(Thread.currentThread().getName()+" is running");
            try{
                thread1.wait();
                System.out.println(Thread.currentThread().getName()+" is running");
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    }
}
class NewThread extends Thread{
    public NewThread(String name){
        super(name);
    }
    public void run(){
        synchronized(this){
            System.out.println(Thread.currentThread().getName()+":"+"notify");
            this.notify();
        }
    }
}

线程thread1是在main这个主线程上创建的，所以一开始运行的时主线程main，当thread1调用start方法，处于就绪状态，直到main被阻塞，cpu允许threadd1执行，会输出thread1：notify，直到thread1调用wait（）方法被进行无线等待，最后main()进行运行。

如下程序：main运行→thread1调用start（）方法运行→然后让thread1调用wait（）方法进行等待→主线程main运行.

public class Test{
    public static void main(String[]args){
        Thread thread1=new NewThread("t1");
        synchronized(thread1){
            try{
                System.out.println(Thread.currentThread().getName()+":"+"running");
                //start thread1
                thread1.start();
                //thread1 wait
                thread1.wait(10000);
                System.out.println(Thread.currentThread().getName()+":"+"running");
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    }
}
class NewThread extends Thread{
    public NewThread(String name){
        super(name);
    }
    public void run(){
        synchronized(this){
            System.out.println(Thread.currentThread().getName()+":"+"running");
        }
    }
}