java,树的创建

package tree;public class TreeNode<T> {    T value;    TreeNode<T> leftChild;    TreeNode<T> rightChild;    TreeNode() {    }    TreeNode(T value) {        this.value = value;     }    //增加左节点    public void addLeft(T value) {        TreeNode<T> leftChild = new TreeNode<T>(value);        this.leftChild=leftChild;    }    //增加右节点    public void addRight(T value) {        TreeNode<T> rightChild = new TreeNode<T>(value);        this.rightChild=rightChild;    }}