设计模式-组合模式（Composite）

 public class TreeNode { 
       
    private String name; 
    private TreeNode parent; 
    private Vector<TreeNode> children = new Vector<TreeNode>(); 
       
    public TreeNode(String name){ 
        this.name = name; 
    } 
   
    public String getName() { 
        return name; 
    } 
   
    public void setName(String name) { 
        this.name = name; 
    } 
   
    public TreeNode getParent() { 
        return parent; 
    } 
   
    public void setParent(TreeNode parent) { 
        this.parent = parent; 
    } 
       
    //添加孩子节点 
    public void add(TreeNode node){ 
        children.add(node); 
    } 
       
    //删除孩子节点 
    public void remove(TreeNode node){ 
        children.remove(node); 
    } 
       
    //取得孩子节点 
    public Enumeration<TreeNode> getChildren(){ 
        return children.elements(); 
    } 
} 

public class Tree { 
   
    TreeNode root = null; 
   
    public Tree(String name) { 
        root = new TreeNode(name); 
    } 
   
    public static void main(String[] args) { 
        Tree tree = new Tree("A"); 
        TreeNode nodeB = new TreeNode("B"); 
        TreeNode nodeC = new TreeNode("C"); 
           
        nodeB.add(nodeC); 
        tree.root.add(nodeB); 
        System.out.println("build the tree finished!"); 
    } 
}