组合模式

public abstract class OrganizationComponent {

    private String name; // 名字
    private String des; // 说明
    
    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) {
        super();
        this.name = name;
        this.des = des;
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getDes() {
        return des;
    }
    public void setDes(String des) {
        this.des = des;
    }
    
    //方法print, 做成抽象的, 子类都需要实现
    protected abstract void print();
}

//University 就是 Composite , 可以管理College
public class University extends OrganizationComponent {

    List<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();

    // 构造器
    public University(String name, String des) {
        super(name, des);
        // TODO Auto-generated constructor stub
    }

    // 重写add
    @Override
    protected void add(OrganizationComponent organizationComponent) {
        // TODO Auto-generated method stub
        organizationComponents.add(organizationComponent);
    }
    // 重写remove
    @Override
    protected void remove(OrganizationComponent organizationComponent) {
        // TODO Auto-generated method stub
        organizationComponents.remove(organizationComponent);
    }
    @Override
    public String getName() {
        // TODO Auto-generated method stub
        return super.getName();
    }
    @Override
    public String getDes() {
        // TODO Auto-generated method stub
        return super.getDes();
    }

    // print方法，就是输出University 包含的学院
    @Override
    protected void print() {
        // TODO Auto-generated method stub
        System.out.println("--------------" + getName() + "--------------");
        //遍历 organizationComponents 
        for (OrganizationComponent organizationComponent : organizationComponents) {
            organizationComponent.print();
        }
    }
}

public class College extends OrganizationComponent {

    //List 中 存放的Department
    List<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();

    // 构造器
    public College(String name, String des) {
        super(name, des);
        // TODO Auto-generated constructor stub
    }

    // 重写add
    @Override
    protected void add(OrganizationComponent organizationComponent) {
        // TODO Auto-generated method stub
        //  将来实际业务中，Colleage 的 add 和  University add 不一定完全一样
        organizationComponents.add(organizationComponent);
    }

    // 重写remove
    @Override
    protected void remove(OrganizationComponent organizationComponent) {
        // TODO Auto-generated method stub
        organizationComponents.remove(organizationComponent);
    }

    @Override
    public String getName() {
        // TODO Auto-generated method stub
        return super.getName();
    }

    @Override
    public String getDes() {
        // TODO Auto-generated method stub
        return super.getDes();
    }

    // print方法，就是输出University 包含的学院
    @Override
    protected void print() {
        // TODO Auto-generated method stub
        System.out.println("--------------" + getName() + "--------------");
        //遍历 organizationComponents 
        for (OrganizationComponent organizationComponent : organizationComponents) {
            organizationComponent.print();
        }
    }
}

public class Department extends OrganizationComponent {

    //没有集合

    public Department(String name, String des) {
        super(name, des);
        // TODO Auto-generated constructor stub
    }

    
    //add , remove 就不用写了，因为他是叶子节点
    
    @Override
    public String getName() {
        // TODO Auto-generated method stub
        return super.getName();
    }
    @Override
    public String getDes() {
        // TODO Auto-generated method stub
        return super.getDes();
    }
    @Override
    protected void print() {
        // TODO Auto-generated method stub
        System.out.println(getName());
    }
}

public class Client {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        //从大到小创建对象 学校
        OrganizationComponent university = new University("清华大学", " 中国顶级大学 ");
        
        //创建 学院
        OrganizationComponent computerCollege = new College("计算机学院", " 计算机学院 ");
        OrganizationComponent infoEngineercollege = new College("信息工程学院", " 信息工程学院 ");
        
        //创建各个学院下面的系(专业)
        computerCollege.add(new Department("软件工程", " 软件工程不错 "));
        computerCollege.add(new Department("网络工程", " 网络工程不错 "));
        computerCollege.add(new Department("计算机科学与技术", " 计算机科学与技术是老牌的专业 "));
        
        //
        infoEngineercollege.add(new Department("通信工程", " 通信工程不好学 "));
        infoEngineercollege.add(new Department("信息工程", " 信息工程好学 "));
        
        //将学院加入到 学校
        university.add(computerCollege);
        university.add(infoEngineercollege);
        
        //university.print();
        infoEngineercollege.print();
    }

}