?? machine.java
字號:
package reeaselock;
public class Machine extends Thread{
private Counter counter;
public Machine(Counter counter)
{
this.counter=counter;
start();
}
public void run(){
for(int i=0;i<100;i++)
{
counter.add();
}
}
public static void main(String args[])throws InterruptedException {
Counter counter1=new Counter();
Counter counter2=new Counter();
counter1.setFriend(counter2);
counter2.setFriend(counter1);
Machine machine1=new Machine(counter1);
Machine machine2=new Machine(counter2);
}
}
class Counter{
private int a;
private Counter friend;
public void setFriend(Counter friend){this.friend=friend;}
public synchronized void add()
{a++;
Thread.yield();
friend.delete();
System.out.println(Thread.currentThread().getName()+":add");
}
public synchronized void delete()
{a--;
System.out.println(Thread.currentThread().getName()+":delete");
}
}
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