Java は単純なツリー構造を実装します

package com.app;
  
 import java.util.ArrayList;
 import java.util.List;
  
 public class treeNode<T> {
   public T t;
   private treeNode<T> parent;
    
   public List<treeNode<T>> nodelist;
    
   public treeNode(T stype){
     t   = stype;
     parent = null;
     nodelist = new ArrayList<treeNode<T>>();
   }
  
   public treeNode<T> getParent() {
     return parent;
   } 
 }

package com.app;
  
 public class tree<T> {
    
   public treeNode<T> root;
    
   public tree(){}
      
   public void addNode(treeNode<T> node, T newNode){
     //增加根节点
     if(null == node){
       if(null == root){
         root = new treeNode(newNode);
       }
     }else{
         treeNode<T> temp = new treeNode(newNode);
         node.nodelist.add(temp);
     }
   }
    
   /*  查找newNode这个节点 */
   public treeNode<T> search(treeNode<T> input, T newNode){
    
     treeNode<T> temp = null;
      
     if(input.t.equals(newNode)){
       return input;
     }
      
     for(int i = 0; i < input.nodelist.size(); i++){
        
       temp = search(input.nodelist.get(i), newNode);
        
       if(null != temp){
         break;
       } 
     }
      
     return temp;
   }
    
   public treeNode<T> getNode(T newNode){
     return search(root, newNode);
   }
    
   public void showNode(treeNode<T> node){
     if(null != node){
       //循环遍历node的节点
       System.out.println(node.t.toString());
        
       for(int i = 0; i < node.nodelist.size(); i++){
         showNode(node.nodelist.get(i));
       }     
     }
   }
 }

package com.app;
  
 public class app {
  
   /**
    * @param args
 */
   public static void main(String[] args) {
     // TODO Auto-generated method stub
     /*简单实现一个树的结构，后续完善解析xml       */
     /*写得满烂的，后续查阅一些其他代码        2012-3-12  */
     //测试
     /*
     * string
     *     hello
     *       sinny
     *       fredric
     *     world
     *      Hi
     *      York
     * */
      
     tree<String> tree = new tree();
     tree.addNode(null, "string");
     tree.addNode(tree.getNode("string"), "hello");
     tree.addNode(tree.getNode("string"), "world");
     tree.addNode(tree.getNode("hello"), "sinny");
     tree.addNode(tree.getNode("hello"), "fredric");
     tree.addNode(tree.getNode("world"), "Hi");
     tree.addNode(tree.getNode("world"), "York");
     tree.showNode(tree.root);
      
     System.out.println("end of the test");
   }
  
 }