package com.sky.responsebility;

// 处理者
public abstract class Approver {

    Approver approver; //下一个处理者
    String name; //名字（具体是 校长，系主任，还是。。。）

    // 构造方法
    public Approver(String name){

        this.name = name;
    }

    //下一个处理者
    public void setApprover(Approver approver) {
        this.approver = approver;
    }

    //处理审批请求的方法，得到一个请求，处理是子类完成，因此该方法做成抽象（因为是要具体的子类去完成请求的处理）
    public abstract void processRequest(PurchaseRequest request);
}

package com.sky.responsebility;

public class DepartmentApprover extends Approver{


    //构造器
    public DepartmentApprover(String name) {
        super(name);
    }

    @Override
    public void processRequest(PurchaseRequest request) {
        if (request.getPrice() <= 5000){
            System.out.println(" 请求编号 id = " + request.getId() + " 被 " + this.name + " 处理");
        }else { // 如果他处理不了，就让他的后继者进行处理
            approver.processRequest(request);
        }
    }
}

package com.sky.responsebility;

public class CollageApprover extends Approver {

    //构造器
    public CollageApprover(String name) {
        super(name);
    }

    @Override
    public void processRequest(PurchaseRequest request) {

        if (request.getPrice() > 5000 && request.getPrice() <= 10000) {
            System.out.println(" 请求编号 id = " + request.getId() + " 被 " + this.name + " 处理");
        }else { // 如果他处理不了，就让他的后继者进行处理
            approver.processRequest(request);
        }
    }
}

package com.sky.responsebility;

/**
 * 副校长
 */
public class ViceSchoolMasterApprover extends Approver {

    //构造器
    public ViceSchoolMasterApprover(String name) {
        super(name);
    }

    @Override
    public void processRequest(PurchaseRequest request) {

        if (request.getPrice() > 10000 && request.getPrice() <= 30000) {
            System.out.println(" 请求编号 id = " + request.getId() + " 被 " + this.name + " 处理");
        }else { // 如果他处理不了，就让他的后继者进行处理
            approver.processRequest(request);
        }
    }
}

package com.sky.responsebility;

public class SchoolMasterApprover extends Approver {

    //构造器
    public SchoolMasterApprover(String name) {
        super(name);
    }

    @Override
    public void processRequest(PurchaseRequest request) {

        if (request.getPrice() > 30000) {
            System.out.println(" 请求编号 id = " + request.getId() + " 被 " + this.name + " 处理");
        }else { // 如果他处理不了，就让他的后继者进行处理
            approver.processRequest(request);
        }
    }
}

package com.sky.responsebility;

/**
 *   请求类
 */
public class PurchaseRequest {

    private int type = 0; // 请求类型
    private float price = 0.0f; // 请求的金额
    private int id = 0; // 默认当前是第一个处理者

    // 构造器
    public PurchaseRequest(int type, float price, int id) {
        this.type = type;
        this.price = price;
        this.id = id;
    }

    // 添加对应的get方法
    public int getType() {
        return type;
    }

    public float getPrice() {
        return price;
    }

    public int getId() {
        return id;
    }
}

package com.sky.responsebility;

/**
 * 客户端
 */
public class Client {

    public static void main(String[] args) {

        // 创建一个请求

// 可以改变金额进行测试
        PurchaseRequest purchaseRequest = new PurchaseRequest(1, 30001, 1);

        //创建相关的审批人、
        Approver departmentApprover = new DepartmentApprover("张主任");
        Approver collageApprover = new CollageApprover("李院长");
        Approver viceSchoolMasterApprover = new ViceSchoolMasterApprover("王副校长");
        Approver schoolMasterApprover = new SchoolMasterApprover("童校长");

        //需要将各个审批级别的下一个处理者设置好（处理人构成环形：【否则会报NullPointerException】）
        departmentApprover.setApprover(collageApprover);
        collageApprover.setApprover(viceSchoolMasterApprover);
        viceSchoolMasterApprover.setApprover(schoolMasterApprover);
        schoolMasterApprover.setApprover(departmentApprover);

        //进行请求的处理
        departmentApprover.processRequest(purchaseRequest);

    }
}

运行结果：

请求编号 id = 1 被 童校长 处理