实战设计模式之状态模式

来源：互联网发布：cms建站系统编辑：程序博客网时间：2024/05/17 09:28

只做代码分析，不做语义解析(高级程序员都从代码和UML理解设计思想)。代码来自尚学堂，UML来自本人手绘：

MMState.java

public abstract class MMState {public abstract void smile();public abstract void cry();public abstract void say();}

MMHappyState.java

public class MMHappyState extends MMState{@Overridepublic void cry() {//happy}@Overridepublic void say() {//hou mummy}@Overridepublic void smile() {//:)}}

MMUnHappyState.java

public class MMUnHappyState extends MMState{@Overridepublic void cry() {//unhappy}@Overridepublic void say() {//hou papa}@Overridepublic void smile() {//:(}}

MM.java

public class MM {private String name;private MMState state = new MMHappyState();public MM(MMState state){this state = state;}public String getName() {return name;}public void setName(String name) {this.name = name;}public void smile() {state.smile();}public void cry() {state.cry();}public void say() {state.say();}}

Boy.java

public class Boy {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}public void pursue(MM mm) {}public void doSomeThing() {MMState state = new MMHappyState();MM mm = new MM(state);mm.smile();mm.cry();mm.say();}}

UML图：

状态模式：当一个对象的内在状态改变时允许改变其行为，这个对象看起来像是改变了其类

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