设计模式学习之状态模式：请假流程

工作流中的请假流程
某人提出请假申请，先由项目经理审批，如果项目经理不同意，审批就直接结束
如项目经理同意，再看是否超过3天，如果三天以内，审批直接结束

否则，交给部门经理，部门经理审核后，无论是否同意，审批直接结束

 

状态类

 

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package com.cmc;   public abstract class State {     public abstract void shenPi(Work w); }

项目经理类，继承了状态类，并实现了状态由项目经理审批转移至部门经理审批：

 

 

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package com.cmc;   public class ProjectManager extends State {       @Override     public void shenPi(Work w) {         if(w.isManagermentAccept()==false){             System.out.println("项目经理不同意，审批结束！");         }else{             if(w.getDay()<=3){                 System.out.println("请假时间在三天以内，项目经理同意，审批结束");             }else{                 System.out.println("请假时间大于三天，移交给部门经理处理！");                 w.setCurrent(new PartmentMeneger());                 w.shenPi();             }         }     }   }

部门经理类：

 

 

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package com.cmc;   public class PartmentMeneger extends State {       @Override     public void shenPi(Work w) {         System.out.println("已经过部门经理审批，审批结束！");     }   }

工作类，拥有一个State的对象，在shenPi方法中将自己回传给State：

 

 

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package com.cmc;   public class Work {     private State current;     private int day;     private boolean isManagermentAccept;     public Work() {         current = new ProjectManager();     }     public State getCurrent() {         return current;     }     public void setCurrent(State current) {         this.current = current;     }     public int getDay() {         return day;     }     public void setDay(int day) {         this.day = day;     }     public boolean isManagermentAccept() {         return isManagermentAccept;     }     public void setManagermentAccept(boolean isManagermentAccept) {         this.isManagermentAccept = isManagermentAccept;     }     public void shenPi(){         current.shenPi(this);     } }

客户端测试一下：

 

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package com.cmc;   public class Client {     public static void main(String [] args){         Work w = new Work();         w.setDay(4);         w.setManagermentAccept(true);         w.shenPi();     } }