生产者消费者打印问题
为什么这个程序执行后没有打印结果？？
package day12;
public class ProducerConsumerDemo {
/**
* @param args
*/
public static void main(String[] args) {
Resource res = new Resource();
Producer pro = new Producer(res);
Consumer con = new Consumer(res);
Thread t1 = new Thread(pro);
Thread t2 = new Thread(con);
t1.start();
t2.start();
}
}
class Resource{
private String name;
private boolean flag = false;
private int count = 1;
public synchronized void set(String name){
while(flag){
try{wait();}catch(Exception e){}
this.name = name + "-------" + count++;
System.out.println(Thread.currentThread().getName()+"....生产者...."+this.name);
flag = true;
this.notifyAll();
}
}
public synchronized void out(){
while(!flag){
try{wait();}catch(Exception e){}
System.out.println(Thread.currentThread().getName()+"....消费者...."+this.name);
flag = false;
this.notifyAll();
}
}
}
class Producer implements Runnable{
private Resource res;
Producer(Resource res){
this.res = res;
}
public void run(){
while(true){
res.set("+商品+");
}
}
}
class Consumer implements Runnable{
private Resource res;
Consumer(Resource res){
this.res = res;
}
public void run(){
while(true){
res.out();
}
}
}
[解决办法]
out方法中判断 while(!flag) 条件成立， wait()住了。
set方法中判断 while(flag) 条件不成立，循环退出，out线程永远wait住了
