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package com.tiantian;
import java.util.*;
public class JAVAContainer {
     public static void main(String[] args) throws Exception {
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Java Éè¼Æģʽ(12)

Observer
Intent
Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
How to
Subject
  
knows its observers. Any number of Observer objects may observe a subject.
  
provides an in ......
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