Java设计模式之组合模式深入刨析

package com.zte;
public abstract class OrganizationComponent {
    private String name;// 名字
    private String des;// 说明
    public String getName() {
        return name;
    }
    public String getDes() {
        return des;
    }
    protected void add(OrganizationComponent organizationComponent) {
        // 默认实现
        throw new UnsupportedOperationException();
    }
    protected void remove(OrganizationComponent organizationComponent) {
        // 默认实现
        throw new UnsupportedOperationException();
    }
    // 构造器
    public OrganizationComponent(String name, String des) {
        this.name = name;
        this.des = des;
    }
    // 方法print，抽象方法
    protected abstract void print();
}

package com.zte;
import java.util.ArrayList;
import java.util.List;
// University 就是 Composite，可以管理College
public class University extends OrganizationComponent {
    List<OrganizationComponent> organizationComponentList = new ArrayList<>();
    // 构造器
    public University(String name, String des) {
        super(name, des);
    }
    //重写add
    @Override
    protected void add(OrganizationComponent organizationComponent) {
        organizationComponentList.add(organizationComponent);
    }
    // 重写remove
    @Override
    protected void remove(OrganizationComponent organizationComponent) {
        organizationComponent.remove(organizationComponent);
    }
    @Override
    protected void print() {
        System.out.println("==========" + getName() + "=========");
        for (OrganizationComponent organizationComponent : organizationComponentList) {
            organizationComponent.print();
        }
    }
    @Override
    public String getName() {
        return super.getName();
    }
    @Override
    public String getDes() {
        return super.getDes();
    }
}

package com.zte;
import java.util.ArrayList;
import java.util.List;
public class College extends OrganizationComponent {
    // list中存放department
    List<OrganizationComponent> organizationComponentList = new ArrayList<>();
    public College(String name, String des) {
        super(name, des);
    }
    //重写add
    @Override
    protected void add(OrganizationComponent organizationComponent) {
        organizationComponentList.add(organizationComponent);
    }
    // 重写remove
    @Override
    protected void remove(OrganizationComponent organizationComponent) {
        organizationComponent.remove(organizationComponent);
    }
    @Override
    protected void print() {
        System.out.println("==========" + getName() + "=========");
        for (OrganizationComponent organizationComponent : organizationComponentList) {
            organizationComponent.print();
        }
    }
    @Override
    public String getName() {
        return super.getName();
    }
    @Override
    public String getDes() {
        return super.getDes();
    }
}

package com.zte;
public class Department extends OrganizationComponent {
    public Department(String name, String des) {
        super(name, des);
    }
    // add和remove方法就不需要再写了
    @Override
    protected void print() {
        System.out.println("===========" + getName() + "=========");
    }
    @Override
    public String getName() {
        return super.getName();
    }
    @Override
    public String getDes() {
        return super.getDes();
    }
}

package com.zte;
public class Client {
    public static void main(String[] args) {
        // 创建大学
        OrganizationComponent university = new University("清华大学", "中国最好的大学");
        // 创建学院
        OrganizationComponent college1 = new College("计算机学院", "计算机学院");
        OrganizationComponent college2 = new College("信息工程学院", "信息工程学院");
        // 创建各个学院下面的系
        college1.add(new Department("软件工程", "软件工程"));
        college1.add(new Department("网络工程", "网络工程"));
        college1.add(new Department("计算机科学与技术", "老牌专业"));
        college2.add(new Department("通信工程", "通信工程"));
        college2.add(new Department("信息工程", "信息工程"));
        // 将学院添加到学校中
        university.add(college1);
        university.add(college2);
        // 打印大学底下的所有院系
        university.print();
        // 打印学院底下的所有系
        college1.print();
    }
}