设计模式之状态

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状态模式：无非就是状态的改变
这里写图片描述

public class App {    public static void main(String[] args) {        Mammoth mammoth=new Mammoth();        mammoth.observe();        mammoth.timePasses();        mammoth.observe();        mammoth.timePasses();        mammoth.observe();    }}

public interface State {    void onEnterState();    void observe();}

public class AngryState implements State {    private Mammoth mammoth;    public AngryState(Mammoth mammoth){        this.mammoth=mammoth;    }    @Override    public void onEnterState() {        System.out.println(mammoth+" 暴怒了");    }    @Override    public void observe() {        System.out.println(mammoth+" 开始生气了!");    }}

public class PeacefulState implements State{    private Mammoth mammoth;    public PeacefulState(Mammoth mammoth){        this.mammoth=mammoth;    }    @Override    public void onEnterState() {        System.out.println(mammoth+" 冷静和安详");    }    @Override    public void observe() {        System.out.println(mammoth+" 冷静下来了");    }}

public class Mammoth {    private State state;    public Mammoth(){        state=new PeacefulState(this);    }    public void timePasses(){        if(state.getClass().equals((PeacefulState.class))){            changeStateTo(new AngryState(this));        }else {            changeStateTo(new PeacefulState(this));        }    }    private void changeStateTo(State newState){        this.state=newState;        this.state.onEnterState();    }    @Override    public String toString() {        return "The mammoth";    }    public void observe(){        this.state.observe();    }}

核心就是Mammoth这个类里面实现了逻辑切换了两个类

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