设计模式——组合模式

Posted 2022-04-10 shenqiaqia

这次来看下组合模式，先看下frist的定义：允许你将对象组合成树形结构来表现“整体/部分”层次结构。组合能让客户以一致的方式处理个别对象以及对象组合。

那在来看下类图吧：

来看下具体代码吧：

package com.shenqi.mode;

import java.util.List;

/**
 * @Author:shenqi
 * @Description:
 * @Date:2019/7/13 18:46
 */
public abstract class Department 

    public String name;

    public int headcount;

    public List<Department> departments;

    public abstract void addDepartment(Department department);

    public abstract void removeDepartment(Department department);

    public String getName() 
        return name;
    

    public void setName(String name) 
        this.name = name;
    

    public int getHeadcount() 
        return headcount;
    

    public void setHeadcount(int headcount) 
        this.headcount = headcount;
    

    public List<Department> getDepartments() 
        return departments;
    

    public void setDepartments(List<Department> departments) 
        this.departments = departments;
    

    public void print() 
        System.out.println("部门名称：" + name + "，人数：" + headcount);
    

　　

package com.shenqi.mode;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author:shenqi
 * @Description:
 * @Date:2019/7/13 18:48
 */
public class ApplicationPlatformDepartment extends Department 

    public ApplicationPlatformDepartment(String name, int headcount) 
        this.name = name;
        this.headcount = headcount;
        departments = new ArrayList<>();
    

    @Override
    public void addDepartment(Department department) 
        departments.add(department);
    

    @Override
    public void removeDepartment(Department department) 
        departments.remove(department);
    

　　

package com.shenqi.mode;

import java.util.ArrayList;

/**
 * @Author:shenqi
 * @Description:
 * @Date:2019/7/13 18:50
 */
public class TechnologyPlatformDepartment extends Department 

    public TechnologyPlatformDepartment(String name, int headcount) 
        this.name = name;
        this.headcount = headcount;
        departments = new ArrayList<>();
    

    @Override
    public void addDepartment(Department department) 
        departments.add(department);
    

    @Override
    public void removeDepartment(Department department) 
        departments.remove(department);
    

　　

package com.shenqi.mode;

import java.util.ArrayList;

/**
 * @Author:shenqi
 * @Description:
 * @Date:2019/7/13 18:52
 */
public class OrderGroup extends Department 

    public OrderGroup(String name, int headcount) 
        this.name = name;
        this.headcount = headcount;
        departments = new ArrayList<>();
    

    @Override
    public void addDepartment(Department department) 

    

    @Override
    public void removeDepartment(Department department) 

    

　　

package com.shenqi.mode;

import java.util.ArrayList;

/**
 * @Author:shenqi
 * @Description:
 * @Date:2019/7/13 18:57
 */
public class ITCenter extends Department 

    public ITCenter(String name, int headcount) 
        this.name = name;
        this.headcount = headcount;
        departments = new ArrayList<>();
    

    @Override
    public void addDepartment(Department department) 
        departments.add(department);
    

    @Override
    public void removeDepartment(Department department) 
        departments.remove(department);
    

　　

package com.shenqi.mode;

import java.util.List;

/**
 * @Author:shenqi
 * @Description:
 * @Date:2019/7/13 18:55
 */
public class DepartmentMain 

    public static void main(String[] args) 
        Department itCenter = new ITCenter("科技与信息中心",1000);
        Department applicationPlatformDepartment = new ApplicationPlatformDepartment("应用平台部", 55);
        Department technologyPlatformDepartment = new TechnologyPlatformDepartment("技术平台部", 20);
        Department orderGroup = new OrderGroup("订单平台组", 10);
        itCenter.addDepartment(applicationPlatformDepartment);
        itCenter.addDepartment(technologyPlatformDepartment);
        applicationPlatformDepartment.addDepartment(orderGroup);

        List<Department> departments = itCenter.getDepartments();
        for(Department department : departments) 
            department.print();
            for(Department dd : department.getDepartments()) 
                dd.print();