第一种方法:使用LockSupport的park和unpark功能(推荐)

简单来说我们有一个名为LockSupport的方法

park就是阻塞当前进程

unpark就是取消阻塞让其继续执行

我们要循环打印ABC三个线程的三个字母

那么我们就可以让三个线程按顺序阻塞和解锁,就能完成打印

代码

import java.util.concurrent.locks.LockSupport;public class demo2 {static Thread t1,t2,t3;public static void main(String[] args) {t1 = new Thread(()->{for (int i = 0; i < 10; i++) {LockSupport.park();System.out.print("A");LockSupport.unpark(t2);}});t2 = new Thread(()->{for (int i = 0; i < 10; i++) {LockSupport.park();System.out.print("B");LockSupport.unpark(t3);}});t3 = new Thread(()->{for (int i = 0; i < 10; i++) {LockSupport.unpark(t1);LockSupport.park();System.out.println("C");}});t1.start();t2.start();t3.start();}
}

第二种方式:synchronized+wait+notify

实际上就是把第一种方式换为用这种方式实现

同样还是控制加锁顺序和解锁顺序罢了

public class demo3 {public static Object ob = new Object();static boolean  Ais = false;static boolean Bis = false;public static void main(String[] args) {Thread t1 = new Thread(()->{synchronized (ob){System.out.print("A");Ais = true;ob.notifyAll();}});Thread t2 = new Thread(()->{synchronized (ob){while(!Ais){try {ob.wait();} catch (InterruptedException e) {throw new RuntimeException(e);}}System.out.print("B");Bis = true;ob.notifyAll();}});Thread t3 = new Thread(()->{synchronized (ob){while(!Bis){try {ob.wait();} catch (InterruptedException e) {throw new RuntimeException(e);}}System.out.println("C");}});for (int i = 0; i < 10; i++) {t1.run();t2.run();t3.run();}}
}

第三种:暴力循环方法(不推荐)

就...相当于创建三十个线程了....如果实在想不起来其他方法就用这个吧....

public class demo2 {public static void main(String[] args) throws InterruptedException {for (int i = 0; i < 10 ; i++) {Thread t1 = new Thread(()->{System.out.print("A");});t1.start();t1.join();Thread t2 = new Thread(()->{System.out.print("B");});t2.start();t2.join();Thread t3 = new Thread(()->{System.out.println("C");});t3.start();t3.join();}}
}