用java语言编写的简单二叉树

package com.cjonline.foundation.evisa;

public class TestTree {

    private int data=-1;
    private TestTree lchild=null;
    private TestTree rchild=null;
    private int pos=-1;    //记录当前已经使用数组的位置
    
    /*
     * 构造二叉树
     */
    public TestTree createTree(TestTree tree,int[] data){
        if(data == null || data.length<1)
            return null;
        tree = new TestTree();
        pos++;
        if(pos<data.length && data[pos]!=-1){
            tree.data=data[pos];
            tree.setLchild(createTree(lchild,data));//设置左孩子
            tree.setRchild(createTree(rchild,data));//设置右孩子
        }
        return tree;
    }
    /*
     * 前序遍历
     */
    public void print(TestTree t){
        if(t!=null && t.getData()!=-1){
            System.out.print("    "+t.getData());
            print(t.getLchild());
            print(t.getRchild());
        }
    }

    @Override
    public String toString() {
        return "TestTree [data=" + data + "]";
    }
    public static void main(String[] args) {
        TestTree tree = new TestTree();
        int[] data =  {1,2,-1,-1,3,-1,-1};
        tree=tree.createTree(tree, data);
        System.out.println(tree);
        System.out.println(tree.getLchild());
        System.out.println(tree.getRchild());
        tree.print(tree);
    }

    /**  
     * 获取data  
     * @return 
     */
    public int getData() {
        return data;
    }

    /** 
     * 设置 data 
     * @param data 
     */
    public void setData(int data) {
        this.data = data;
    }

    /**  
     * 获取lchild  
     * @return 
     */
    public TestTree getLchild() {
        return lchild;
    }

    /** 
     * 设置 lchild 
     * @param lchild 
     */
    public void setLchild(TestTree lchild) {
        this.lchild = lchild;
    }

    /**  
     * 获取rchild  
     * @return 
     */
    public TestTree getRchild() {
        return rchild;
    }

    /** 
     * 设置 rchild 
     * @param rchild 
     */
    public void setRchild(TestTree rchild) {
        this.rchild = rchild;
    }

    /**  
     * 获取pos  
     * @return 
     */
    public int getPos() {
        return pos;
    }

    /** 
     * 设置 pos 
     * @param pos 
     */
    public void setPos(int pos) {
        this.pos = pos;
    }

}