锁死了，全部等待notifyAll()

package Practice;
import java.util.Random;
class Stage
{
    Random rand=new Random();
    private int size;
    private int count;
    public void setSize(int size){this.size=size;}
    public void setCount(int count){this.count=count;}
    public int getSize(){return size;}
    public int getCount(){return count;}
    public String toString(){return "仓库大小:"+size+"\t剩余:"+count+"。";}
    public boolean flag=false;
    public synchronized void push()
    {
        while(flag)
            try{wait();}
        catch(Exception e){}
        int temp=rand.nextInt(size-count);
        System.out.println(toString()+Thread.currentThread().getName()+"，准备生产:"+temp);
        count+=temp;
        flag=true;
        notifyAll();
    }
    public synchronized void pop()
    {
        while(!flag)
            try{wait();}
        catch(Exception e){}
        int temp=rand.nextInt(count);
        System.out.println(toString()+Thread.currentThread().getName()+"，准备消费:"+temp);
        count=count-temp;
        flag=false;
        notifyAll();
    }
    }
class Productor implements Runnable{
        // TODO Auto-generated method stub
    private Stage s;
    Productor(Stage s){this.s=s;}
    public void run() {
        while(true)
            s.push();
    }
    }
    class Consummer implements Runnable{
        private Stage s;
        Consummer(Stage s){this.s=s;}
        public void run() {
            // TODO Auto-generated method stub
            while(true)
                s.pop();
        }
                                                                                
}
public class MyThreadTest {
public static void main(String[] args) {
                                                                                
// TODO Auto-generated method stub
;
Stage s=new Stage();
s.setSize(80);
s.setCount(10);
new Thread(new Productor(s) ).start();
new Thread(new Productor(s) ).start();
new Thread(new Consummer(s) ).start();
new Thread(new Consummer(s) ).start();
    }
}//打印结果
/*仓库大小:80   剩余:69。Thread-1，准备生产:2
仓库大小:80 剩余:71。Thread-2，准备消费:51
仓库大小:80 剩余:20。Thread-1，准备生产:47
仓库大小:80 剩余:67。Thread-3，准备消费:49
仓库大小:80 剩余:18。Thread-0，准备生产:16
仓库大小:80 剩余:34。Thread-3，准备消费:30
仓库大小:80 剩余:4。Thread-1，准备生产:31
仓库大小:80 剩余:35。Thread-2，准备消费:14
仓库大小:80 剩余:21。Thread-1，准备生产:26
仓库大小:80 剩余:47。Thread-3，准备消费:34
.
.
.
*/