知识点树与组合模式

 知识点树与组合设计模式：

知识点树在库中根据编号来实现，在java类中用组合模式来实现。

uml图：

 JAVA实现代码：

 

AbstractNode抽象类：

package test.GOF.composite;

public abstract class AbstractNode {
	public abstract boolean add(AbstractNode node);

	public abstract boolean remove(AbstractNode node);

	public abstract void diplay(int deth);

}

 

LeafNode类：

package test.GOF.composite;

public class LeafNode extends AbstractNode {

	private String name = "";

	public LeafNode() {
	}

	public LeafNode(String name) {
		this.name = name;
	}

	@Override
	public boolean add(AbstractNode node) {
		System.out.println("是叶子了，没有子节点了！");
		return false;
	}

	@Override
	public void diplay(int depth) {

		for (int i = 0; i < depth; i++) {
			System.out.print("-");
		}
		System.out.println(this.name);
	}

	@Override
	public boolean remove(AbstractNode node) {
		System.out.println("没有子节点,不可删除！");
		return false;
	}

}

 

 Node类：

package test.GOF.composite;

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

public class Node extends AbstractNode {
	String name = "";
	List<AbstractNode> child = new ArrayList<AbstractNode>();

	public Node() {
	}

	public Node(String name) {
		this.name = name;
	}

	@Override
	public boolean add(AbstractNode node) {
		return child.add(node);
	}

	@Override
	public void diplay(int depth) {
		for (int i = 0; i < depth; i++) {
			System.out.print("-");
		}
		System.out.println(this.name);
		for (AbstractNode node : child) {
			node.diplay(depth + 1);
		}
	}

	@Override
	public boolean remove(AbstractNode node) {
			return child.remove(node);
	}

}

 

MainTest类：

package test.GOF.composite;

public class MainTest {
	public static void main(String[] args) {
		
		LeafNode leaf1 = new LeafNode("010101");
		LeafNode leaf2 = new LeafNode("010102");
		LeafNode leaf3 = new LeafNode("010103");
		Node node1 = new Node("0101");
		node1.add(leaf1);
		node1.add(leaf2);
		node1.add(leaf3);
		
		leaf1 = new LeafNode("0102");
		leaf2 = new LeafNode("0103");
		Node root = new Node("01");
		root.add(node1);
		root.add(leaf1);
		root.add(leaf2);
	        
		root.diplay(0);

	}

}