例五.txt

这是一本java基础教程 对新手上路有很大帮助

class TargetObject implements Runnable{
    private int number=0;
    public void setNumber(int n){
        number=n;
    }
    public void run(){
        while(true){
           if(Thread.currentThread().getName().equals("add")){
               number++;
               System.out.printf("%d\n",number);
           }
           if(Thread.currentThread().getName().equals("sub")){
               number--;
               System.out.printf("%12d\n",number);
           }
          try{  Thread.sleep(1000);
          }
          catch(InterruptedException e) {}
        } 
    }
}
public class Example8_5{
    public static void main(String args[ ]){
        Thread threadA,threadB,threadC,threadD;
        TargetObject a1=new TargetObject(),            //线程的目标对象
                   a2=new TargetObject();
        threadA=new Thread(a1);                    //目标对象是a1的线程
        threadB=new Thread(a1);
        a1.setNumber(10);
        threadA.setName("add");
        threadB.setName("add");
        threadC=new Thread(a2);                    //目标对象是a2的线程
        threadD=new Thread(a2);
        a2.setNumber(-10);
        threadC.setName("sub");
        threadD.setName("sub");
        threadA.start();
        threadB.start();
        threadC.start();
        threadD.start();
    }
}