设计模式职责链模式

类图

 

源码

ShoppingRequest.java

package com.chain;

public class ShoppingRequest {
    private String shoppingReason;
    private double billMoney;
    public ShoppingRequest(String shoppingReason,double billMoney)
    {
        this.shoppingReason=shoppingReason;
        this.billMoney=billMoney;
    }
    public String getShoppingReason() {
        return shoppingReason;
    }
    public void setShoppingReason(String shoppingReason) {
        this.shoppingReason = shoppingReason;
    }
    public double getBillMoney() {
        return billMoney;
    }
    public void setBillMoney(double billMoney) {
        this.billMoney = billMoney;
    }
    

}

Leader.java

package com.chain;

public abstract class Leader {
    protected String name;
    protected Leader successor;
    public Leader(String name)
    {
        this.name=name;
    }
    public void setSuccessor(Leader successor)
    {
        this.successor=successor;
    }
    public abstract void HandleRequest(ShoppingRequest request);
}

Director.java

package com.chain;

public class Director extends Leader{
    public Director(String name)
    {
        super(name);
    }
    public void HandleRequest(ShoppingRequest request)
    {
        if(request.getBillMoney()<10000.00)
        {
            System.out.println("主任"+name+"处理物资采购："+
        request.getShoppingReason()+",批准采购资金为："+request.getBillMoney()+"RMB");
        }else
        {
            if(this.successor!=null) {
                this.successor.HandleRequest(request);
            }
        }
    }
}

DepartmentManager.java

package com.chain;

public class DepartmentManager extends Leader{
    public DepartmentManager(String name) {
        super(name);
    }
    public void HandleRequest(ShoppingRequest request) {
        if(request.getBillMoney()<50000.00)
        {
            System.out.println("部门经理"+name+"处理物资采购："+
        request.getShoppingReason()+",批准采购资金为："+request.getBillMoney()+"RMB");
        }else
        {
            if(this.successor!=null) {
                this.successor.HandleRequest(request);
            }
        }
    }
}

ViceManager.java
package com.chain;

public class ViceManager extends Leader{
    public ViceManager(String name) {
        super(name);
    }
    public void HandleRequest(ShoppingRequest request) {
        if(request.getBillMoney()<100000.00)
        {
            System.out.println("副经理"+name+"处理物资采购："+
        request.getShoppingReason()+",批准采购资金为："+request.getBillMoney()+"RMB");
        }else
        {
            if(this.successor!=null) {
                this.successor.HandleRequest(request);
            }
        }
    }
}

GeneralManager.java

package com.chain;

public class GeneralManager extends Leader {
    public GeneralManager(String name) {
        super(name);
    }
    public void HandleRequest(ShoppingRequest request) {
        if(request.getBillMoney()<200000.00)
        {
            System.out.println("总经理"+name+"处理物资采购："+
        request.getShoppingReason()+",批准采购资金为："+request.getBillMoney()+"RMB");
        }else
        {
            if(this.successor!=null) {
                this.successor.HandleRequest(request);
            }
        }
    }
}

MeetManager.java

package com.chain;

public class MeetManager extends Leader{
    public MeetManager(String name) {
        super(name);
    }
    public void HandleRequest(ShoppingRequest request) {
        if(request.getBillMoney()>=200000.00)
        {
            System.out.println("职工大会"+name+"处理："+
        request.getShoppingReason()+",批准采购资金为："+request.getBillMoney()+"RMB");
        }else
        {
            if(this.successor!=null) {
                this.successor.HandleRequest(request);
            }
        }
    }

}

Client.java

package com.chain;

public class Client {
    public static void main(String[] args) {
        Leader objDirector,objDepartmentManager,objViceManager,objGeneralManager,objMeetManager;
        
        objDirector = new Director("张三");
        objDepartmentManager=new DepartmentManager("李四");
        objViceManager=new ViceManager("王五");
        objGeneralManager =new GeneralManager("钱六");
        objMeetManager =new MeetManager("全体职工");
        objDirector.setSuccessor(objDepartmentManager);
        objDepartmentManager.setSuccessor(objViceManager);
        objViceManager.setSuccessor(objGeneralManager);
        objGeneralManager.setSuccessor(objMeetManager);
        ShoppingRequest shopping1=new ShoppingRequest("购买打印纸", 1000.00);
        objDirector.HandleRequest(shopping1);
        ShoppingRequest shopping2=new ShoppingRequest("配置空调", 25000.00);
        objDepartmentManager.HandleRequest(shopping2);
        ShoppingRequest shopping3=new ShoppingRequest("更新电脑", 80000.00);
        objViceManager.HandleRequest(shopping3);
        ShoppingRequest shopping4=new ShoppingRequest("车间维修", 150000.00);
        objGeneralManager.HandleRequest(shopping4);
        ShoppingRequest shopping5=new ShoppingRequest("收购红星公司", 4000000.00);
        objMeetManager.HandleRequest(shopping5);
    }
}

测试截图