java线程之间的通信

问题：在线程中我们会遇见两个线程之间的通信，一个线程处于等待状态，另一个线程通知才会继续往下运行。

方法：1、利用object 的wait 和notify 属性 2、加上锁synchronized。

package com.thread;


public class ThreadA extends Thread {
Object lock = new Object();


@Override
public void run() {
try {
synchronized (lock) {
ThreadB t = new ThreadB(lock);
t.start();
System.out.println("主线程等待");
lock.wait();
System.out.println("我已经睡醒啦，可以继续工作了");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}


public static void main(String[] args) {
ThreadA t = new ThreadA();
t.start();
}
}package com.thread;


public class ThreadA extends Thread {
Object lock = new Object();


@Override
public void run() {
try {
synchronized (lock) {
ThreadB t = new ThreadB(lock);
t.start();
System.out.println("主线程等待");
lock.wait();
System.out.println("我已经睡醒啦，可以继续工作了");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}


public static void main(String[] args) {
ThreadA t = new ThreadA();
t.start();
}
}

package com.thread;


public class ThreadB extends Thread {
Object lock;


public ThreadB(Object lock) {
this.lock = lock;
}


@Override
public void run() {
try {
synchronized (lock) {
System.out.println("执行子线程方法");
lock.notify();
Thread.sleep(5000);
System.out.println("我已经喊醒主线程，我可以结束了");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}