java设计模式_组合模式-优快云博客

本文介绍了一种使用Java实现的复合模式设计案例。该案例通过抽象组件(Component)类定义了添加、删除及显示的方法，并通过叶节点(Reaf)类与复合节点(Composite)类具体实现这些行为。复合节点可以包含叶节点或其他复合节点，从而形成树形结构。最后通过客户端代码演示了如何创建并展示复合结构。

2019独角兽企业重金招聘Python工程师标准>>>

/**
 * 
 */
package com.wangbiao.design.composite;

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

/**
 * @Title: Component.java
 * @Package com.wangbiao.design.composite
 * @Description: TODO 
 * @author wangbiao   
 * @date 2014-9-28 上午9:50:26 
 * @version V1.0
 */
public abstract class Component {
    String name = null;
    
    public Component(String name) {
        this.name = name;
    }
    
    public abstract void add(Component component);
    public abstract void remove(Component component);
    public abstract void display();

}

class Reaf extends Component{
    
    public Reaf(String name) {
        super(name);
    }

    @Override
    public void add(Component component) {
        // not applicable for Reaf
        System.out.println("Not applicable for Reaf");
    }

    @Override
    public void remove(Component component) {
        // not applicable for Reaf
        System.out.println("Not applicable for Reaf");
    }

    @Override
    public void display() {
        System.out.println("Reaf: "+ name);
    }

}

class Composite extends Component{
    private List<Component> list = new ArrayList<Component>();
    
    public Composite(String name) {
        super(name);
    }

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

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

    @Override
    public void display() {
        for (Component component : list) {
            if(component instanceof Composite){
                System.out.println("xxxxxxxxxxxxxxCompositexxxxxxxxxxxxxx : "+component.name);
            }else{
                System.out.println("xxxxxxxxxxxxxxReafxxxxxxxxxxxxxx : "+component.name);
            }
            component.display();
        }
        
    }
    
}

/**
 * 
 */
package com.wangbiao.design.composite;

/**
 * @Title: Client.java
 * @Package com.wangbiao.design.composite
 * @Description: TODO 
 * @author wangbiao   
 * @date 2014-9-28 上午10:04:16 
 * @version V1.0
 */
public class Client {

    /**
     * @param args
     */
    public static void main(String[] args) {
        
        Component component_one = new Composite("Compositexxxxxxxx");
        component_one.add(new Reaf("reaf_one"));
        component_one.add(new Reaf("reaf_two"));
        
        Component component_two = new Composite("xxxxxxxxComposite");
        component_two.add(new Reaf("reaf_three"));
        component_two.add(new Reaf("reaf_four"));
        
        component_one.add(component_two);
        
        component_one.display();
    }
    
    /*
     * result
    xxxxxxxxxxxxxxReafxxxxxxxxxxxxxx : reaf_one
    Reaf: reaf_one
    xxxxxxxxxxxxxxReafxxxxxxxxxxxxxx : reaf_two
    Reaf: reaf_two
    xxxxxxxxxxxxxxCompositexxxxxxxxxxxxxx : xxxxxxxxComposite
    xxxxxxxxxxxxxxReafxxxxxxxxxxxxxx : reaf_three
    Reaf: reaf_three
    xxxxxxxxxxxxxxReafxxxxxxxxxxxxxx : reaf_four
    Reaf: reaf_four
    */

}

转载于:https://my.oschina.net/u/617909/blog/322766