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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.
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1.SnakeModel.java
import java.util.Observable;
import java.util.LinkedList;
import java.util.Arrays;
import java.util.Random;
import javax.swing.*;
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package com.state;
public class KissingPrincess {
// ±ê־룬±êÖ¾ÊÇÇàÍÜ»¹ÊÇÍõ×Ó¡£
private boolean isFrog = true;
// ¸ù¾ÝisFrog½øÐв»Í¬µÄ²Ù×÷¡£
public void greet() {
if (isFrog)
......