大话设计模式-状态模式_.net大话状态模式

场景：工作状态随时间的变化而变化

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

要点：工作由状态聚合而成；将状态的变化影响抽象出来，且状态变化依赖工作类本身；抽象状态类代理了工作类

1. 抽象状态，早晨状态、中午状态、下午状态、下班状态

package com.hj.designPattern.behavior.state;
 
public abstract class State {
    public abstract void writeProgram(Work work);
}
 
 
package com.hj.designPattern.behavior.state;
 
 
public class MorningState extends State {
    @Override
    public void writeProgram(Work work) {
        if(work.getHour()>9 && work.getHour()<=12){
            System.out.println("精神抖擞，活力满满");
        } else {
            work.setNextState(new NoonState());
            work.writeProgram();
        }
    }
}
 
 
package com.hj.designPattern.behavior.state;
 
public class NoonState extends State {
    @Override
    public void writeProgram(Work work) {
        if(work.getHour()>12 && work.getHour()<=15){
            System.out.println("吃饱喝足，有点犯困");
        } else {
            work.setNextState(new AfternoonState());
            work.writeProgram();
        }
    }
}
 
 
package com.hj.designPattern.behavior.state;
 
public class AfternoonState extends State {
    @Override
    public void writeProgram(Work work) {
        if(work.getHour()>15 && work.getHour()<=18){
            System.out.println("快下班了，努力工作");
        } else {
            work.setNextState(new FinishState());
            work.writeProgram();
        }
    }
}
 
 
package com.hj.designPattern.behavior.state;
 
public class FinishState extends State {
    @Override
    public void writeProgram(Work work) {
        if(work.getHour()>18 && work.getHour()<=24 || work.getHour()>0 && work.getHour()<=9){
            System.out.println("下班了，休息休息，谁也不要打扰我");
        } else {
            work.setNextState(new MorningState());
            work.writeProgram();
        }
    }
}

2. 工作类

package com.hj.designPattern.behavior.state;
 
 
public class Work {
    private State state;
    private int hour;
 
    Work(){
        state = new MorningState();
    }
 
    public void writeProgram(){
        state.writeProgram(this);
    }
    public void setNextState(State state){
        this.state = state;
    }
 
    public int getHour() {
        return hour;
    }
 
    public void setHour(int hour) {
        this.hour = hour;
    }
}

 3. 测试类

package com.hj.designPattern.behavior.state;
 
public class StateTest {
    public static void main(String[] args) {
        Work work = new Work();
        work.setHour(8);
        work.writeProgram();
 
        work.setHour(10);
        work.writeProgram();
 
        work.setHour(14);
        work.writeProgram();
 
        work.setHour(17);
        work.writeProgram();
 
        work.setHour(23);
        work.writeProgram();
    }
}