设计模式--结构型--组合模式

组合模式

允许你将对象组合成树型结构来表现“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。

package com.componentpattern;

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

public abstract class Component {

	private String componentname;

	public String getComponentname() {
		return componentname;
	}

	public void setComponentname(String componentname) {
		this.componentname = componentname;
	}

	public abstract void add(Component component);

	public abstract void remove(Component component);

	public void getInfo() {
		System.out.println(this.getComponentname());
	}

	public  List<Component> components = new ArrayList<Component>();

	public List getComponents() {
		return components;
	}

}

package com.componentpattern;

public class ComponentOne extends Component {

	public ComponentOne(String componentname) {
		this.setComponentname(componentname);
		this.components = null;//叶子节点
	}

	@Override
	public void add(Component component) {
	}

	@Override
	public void remove(Component component) {
	}

}

package com.componentpattern;

public class ComponentTwo extends Component {

	public ComponentTwo(String componentname) {
		this.setComponentname(componentname);
		this.components = null;   //叶子节点
	}

	public void add(Component component) {
		// TODO Auto-generated method stub
	}

	public void remove(Component component) {
		// TODO Auto-generated method stub
	}
}

package com.componentpattern;

public class ComponentThree extends Component {

	public ComponentThree(String componentname) {
		this.setComponentname(componentname);
	}

	@Override
	public void add(Component component) {
		// TODO Auto-generated method stub
		this.components.add(component);
	}

	@Override
	public void remove(Component component) {
		// TODO Auto-generated method stub
		this.components.remove(component);
	}

}

package com.componentpattern;

import java.util.List;

public class Test {

	public static void main(String[] args) {
		ComponentOne one = new ComponentOne("one");
		ComponentTwo two = new ComponentTwo("two");
		ComponentThree three = new ComponentThree("three");

		three.add(one);
		three.add(two);

		one.getInfo();
		two.getInfo();
		three.getInfo();
		List<Component> list = three.getComponents();
		for (Component c : list) {
			c.getInfo();
		}

	}

}

输出结果 ：
one
two
three
one
two