Wait /notify + synchronized

Q: How do threads alternately print A1B2C3? Implement wait/notify + synchronized.

import java.util.concurrent.TimeUnit; public class WaitNotifyTest { public static void main(String[] args) { Object obj = new Object(); new Thread(() -> { synchronized (obj) { for (char i = 'A'; i <= 'Z'; i++) { System.out.println(Thread.currentThread().getName() + "======== " + i); obj.notify(); try { obj.wait(); TimeUnit.SECONDS.sleep(1); } catch (InterruptedException e) { e.printStackTrace(); } } } }, "thread-A").start(); new Thread(() -> { synchronized (obj) { for (int i = 1; i <= 26; i++) { System.out.println(Thread.currentThread().getName() + "======== " + i); obj.notify(); try { obj.wait(); TimeUnit.SECONDS.sleep(1); } catch (InterruptedException e) { e.printStackTrace(); } } } }, "thread-1").start(); }}Copy the code