threadexp3.java

java关于多线程的课堂练习

/**
 * @(#)ThreadExp3.java
 *
 *
 * @author 
 * @version 1.00 2007/11/29
 */

public class ThreadExp3 {
        
    /**
     * Creates a new instance of <code>ThreadExp3</code>.
     */
    public ThreadExp3() {
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
       Thread threadA,threadB,threadC,threadD;
       TargetObject  a1=new TargetObject(),a2=new TargetObject();
       threadA=new Thread(a1);
       threadB=new Thread(a1);
       a1.setNumber(10);
       threadA.setName("add1");
       threadB.setName("add2");
       threadC=new Thread(a2);
       threadD=new Thread(a2);
       a2.setNumber(-10);
       threadC.setName("sub1");
       threadD.setName("sub2");
       threadA.start();
       threadB.start();
       threadC.start();
       threadD.start();
    }
}
class  TargetObject  implements  Runnable {
 private  int  number=0;
 public void setNumber(int n) {
   number=n;
 }
 public void run() {
  while (true) {
   if (Thread.currentThread().getName().substring(0,3).equals("add")) {
     number++;
     System.out.println("现在是"+Thread.currentThread().getName()+"在运行 number等于"+number);
   }
   if (Thread.currentThread().getName().substring(0,3).equals("sub")) {
   	number--;
   	System.out.println("现在是"+Thread.currentThread().getName()+"在运行 number等于"+number);
   }
   try {
    Thread.sleep(1000);
   }
   catch (InterruptedException e) {
     System.out.println("there is interruption!"+e);
   }
  }
 }
 }