java 一个线程执行减，一个线程执行加

1 class MyThreadA implements Runnable{
         
   2     private boolean flag=true;  3     public void run(){
         
   4         int i=0;  5         while(this.flag){
         
   6             while(true){
         
   7                 System.out.println(Thread.currentThread().getName()+"运行，i="+(i++));  8             }  9         } 10     } 11 } 12     class MyThreadB implements Runnable{
         
  13         private boolean flag=true; 14         public void run(){
         
  15             int i=0; 16             while(this.flag){
         
  17                 while(true){
         
  18                     System.out.println(Thread.currentThread().getName()+"运行，i="+(i--)); 19                 } 20             } 21         } 22     } 23         24 public class StopDemo {
         
  25     public static void main(String[] args) {
         
  26         MyThreadA A=new MyThreadA(); 27         MyThreadB B=new MyThreadB(); 28         Thread A1=new Thread(A,"线程"); 29         Thread B1=new Thread(B,"xc"); 30         A1.start(); 31         B1.start(); 32 33     } 34 35 }