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文章目录
  1. 状态模式

状态模式

  • 允许一个对象在其内部状态改变时改变它的行为，对象看起来似乎修改了它的类。
    State
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public interface PhoneState {
    void handle(Phone phone);
}
public class NormalState implements PhoneState {
    @Override
    public void handle(Phone phone) {
        System.out.println("系统关机");
        phone.setPhoneState(new ShutdownState());
    }
}
public class ShutdownState implements PhoneState {
    @Override
    public void handle(Phone phone) {
        System.out.println("系统开机");
        phone.setPhoneState(new NormalState());
    }
}
public class Phone {
    private PhoneState phoneState;
    public Phone(){
        this.phoneState=new ShutdownState();
    }
    public void clickButton(){
        phoneState.handle(this);
    }
    public void setPhoneState(PhoneState phoneState) {
        System.out.println("状态改变:"+phoneState.toString());
        this.phoneState = phoneState;
    }
}
public class App {
    public static void main(String[] args) {
        Phone phone=new Phone();
        phone.clickButton();
        phone.clickButton();
    }
}
文章目录
  1. 状态模式