Java 多线程有序执行的几种方法总结

import java.util.concurrent.atomic.AtomicInteger;

public class OrderedThread1 {
 
 static AtomicInteger count = new AtomicInteger(0);

 public static void main(String[] args) throws InterruptedException {
 Task task1 = new Task(count, 0);
 Task task2 = new Task(count, 1);
 Task task3 = new Task(count, 2);
 Thread thread1 = new Thread(task1);
 Thread thread2 = new Thread(task2);
 Thread thread3 = new Thread(task3);
 thread1.setDaemon(true);
 thread2.setDaemon(true);
 thread3.setDaemon(true);
 thread1.start();
 thread2.start();
 thread3.start();
 
 Thread.sleep(1 * 1000);
 }

}

class Task implements Runnable {
 
 private AtomicInteger count;
 private int order;
 
 public Task(AtomicInteger count, int order) {
 this.count = count;
 this.order = order;
 }

 @Override
 public void run() {
 while (true) {
  if (count.get() % 3 == order) {
  System.out.println(Thread.currentThread().getName() + " ===== "+ order);
  count.incrementAndGet();
  }
 }
 }
}

public class OrderedThread2 {
 static Holder holder = new Holder();
 public static void main(String[] args) throws InterruptedException {
 
 Task1 task1 = new Task1(holder, 0);
 Task1 task2 = new Task1(holder, 1);
 Task1 task3 = new Task1(holder, 2);
 Thread thread1 = new Thread(task1);
 Thread thread2 = new Thread(task2);
 Thread thread3 = new Thread(task3);
 thread1.setDaemon(true);
 thread2.setDaemon(true);
 thread3.setDaemon(true);
 thread1.start();
 thread2.start();
 thread3.start();
 
 Thread.sleep(1 * 1000);
 

 }

}

class Task1 implements Runnable {
 
 Holder holder;
 int order;
 
 public Task1(Holder holder, int order) {
 this.holder = holder;
 this.order = order;
 }

 @Override
 public void run() {
 while (true) {
  if (holder.count % 3 == order) {
  System.out.println(Thread.currentThread().getName() + " ===== "+ order);
  holder.count ++;
  }
 }
// int i = 0;
// while(i ++ < 10000){
//  holder.count ++;
// }
 }
}
class Holder {
 volatile int count = 0;
}