多线程 plate

package com.phj20110824.bread;import java.util.ArrayList;   import java.util.List;     public class Plate {         List<Object> eggs = new ArrayList<Object>();         public synchronized Object getEgg() {           if (eggs.size() == 0) {               try {                   wait();               } catch (InterruptedException e) {               }           }             Object egg = eggs.get(0);           eggs.clear();// 清空盘子           notify();// 唤醒阻塞队列的某线程到就绪队列           System.out.println("拿到鸡蛋");           return egg;       }         public synchronized void putEgg(Object egg) {           if (eggs.size() > 0) {               try {                   wait();               } catch (InterruptedException e) {               }           }           eggs.add(egg);// 往盘子里放鸡蛋           notify();// 唤醒阻塞队列的某线程到就绪队列           System.out.println("放入鸡蛋");       }              static class AddThread extends Thread{           private Plate plate;           private Object egg=new Object();           public AddThread(Plate plate){               this.plate=plate;           }                      public void run(){               for(int i=0;i<5;i++){                   plate.putEgg(egg);               }           }       }              static class GetThread extends Thread{           private Plate plate;           public GetThread(Plate plate){               this.plate=plate;           }                      public void run(){               for(int i=0;i<5;i++){                   plate.getEgg();               }           }       }              public static void main(String args[]){           try {               Plate plate=new Plate();               Thread add=new Thread(new AddThread(plate));               Thread get=new Thread(new GetThread(plate));               add.start();               get.start();               add.join();               get.join();           } catch (InterruptedException e) {               e.printStackTrace();           }           System.out.println("测试结束");       }   }