设计模式 之 组合模式

没明白有啥牛逼之处

package com.test.pattern.composite;

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

/**
 * @author wangx
 * @Date: 2016年8月18日 
 * @func: 组合模式
 * @Copyright: 2016 wangx. All rights reserved.
 */
public class ComponentDemo  {
    public abstract class Component {
        String name;
        public abstract void add(Component component);
        public abstract void remove(Component component);
        public abstract void eachChild();
    }
    
    //组合部件类
    public class Leaf extends Component{

        //叶子节点不具备添加的能力，所以不实现
        @Override
        public void add(Component component) {
            System.out.println("");
        }
        // 叶子节点不具备添加的能力必然也不能删除  
        @Override
        public void remove(Component component) {
            System.out.println();
        }
        // 叶子节点没有子节点所以显示自己的执行结果  
        @Override
        public void eachChild() {
            System.out.println(name + "执行了");
        }
    }
    //组合类
    public class Composite extends Component {

        List<Component> list = new ArrayList<Component>();
        
        //添加节点，添加部件
        @Override
        public void add(Component component) {
            list.add(component);
        }

        @Override
        public void remove(Component component) {
            list.remove(component);
        }

        @Override
        public void eachChild() {
            System.out.println(name + "执行了");
            for (Component component : list) {
                component.eachChild();
            }
        }
    }
    public static void main(String[] args) {
        ComponentDemo demo = new ComponentDemo();  
        // 构造根节点  
        Composite rootComposite = demo.new Composite();  
        rootComposite.name = "根节点";  
  
        // 左节点  
        Composite compositeLeft = demo.new Composite();  
        compositeLeft.name = "左节点";  
  
        // 构建右节点，添加两个叶子几点，也就是子部件  
        Composite compositeRight = demo.new Composite();  
        compositeRight.name = "右节点";  
        Leaf leaf1 = demo.new Leaf();  
        leaf1.name = "右-子节点1";  
        Leaf leaf2 = demo.new Leaf();  
        leaf2.name = "右-子节点2";  
        compositeRight.add(leaf1);  
        compositeRight.add(leaf2);  
  
        // 左右节点加入 根节点  
        rootComposite.add(compositeRight);  
        rootComposite.add(compositeLeft);  
        // 遍历组合部件  
        rootComposite.eachChild(); 
    }
}