Java-交替打印0-100

1. 使用violate

   public class Main {
       private static volatile int flag = 1;
       public static void main(String[] args) {
           new Thread(()->{
               int i = 1;
               while(i < 100) {
                   if(flag == 1) {
                       System.out.println(Thread.currentThread().getName() + ":" + i);
                       i += 2;
                       flag = 0;
                   }
               }
           }).start();
           new Thread(()->{
               int i = 2;
               while(i < 100) {
                   if(flag == 0) {
                       System.out.println(Thread.currentThread().getName() + ":" + i);
                       i += 2;
                       flag = 1;
                   }
               }
           }).start();
       }
   }
   

2. 使用sychronized

   public class Main {
       public static void main(String[] args) {
           Thread1 thread = new Thread1();
           Thread thread1 = new Thread(thread);
           Thread thread2 = new Thread(thread);
           thread1.start();
           thread2.start();
       }
   }
   
   class Thread1 implements Runnable {
       int i = 0;
       @Override
       public void run() {
           while(i < 100) {
               synchronized (this) {
                   i++;
                   System.out.println(Thread.currentThread().getName() + ":" + i);
                   notify();
                   try {
                       wait();
                   } catch (InterruptedException e) {
                       e.printStackTrace();
                   }
               }
           }
       }
   }