当对象的状态改变时，同时改变其行为
这让我想到了iOS 中按钮不同状态，绑定不同的方法和不同的title等～～
//State类是个状态类
public class State {
private String value;
public void method1(){
System.out.println("execute the first opt!");
}
public void method2(){
System.out.println("execute the second opt!");
}
}
//Context类实现切换
public class Context {
private State state;
public Context(State state) {
this.state = state;
}
public State getState() {
return state;
}
public void setState(State state) {
this.state = state;
}
public void method() {
if (state.getValue().equals("state1")) {
state.method1();
} else if (state.getValue().equals("state2")) {
state.method2();
}
}
}
//测试
public class Test {
public static void main(String[] args) {
State state = new State();
Context context = new Context(state);
//设置第一种状态
state.setValue("state1");
context.method();
//设置第二种状态
state.setValue("state2");
context.method();
}
}
状态模式在日常开发中确实用的挺多的.......
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