二叉树的镜像

操作给定的二叉树，将其变换为源二叉树的镜像。
输入描述:

/**
public class TreeNode {
int val = 0;
TreeNode left = null;
TreeNode right = null;

public TreeNode(int val) {
this.val = val;

}

}
*/
public class Solution {

public int Mirror1(TreeNode root) {
if(root !=null){
TreeNode root1 = root.left;
root.left = root.right;
root.right =root1;
Mirror1(root.left);
Mirror1(root.right);
}
return 0;
}
public void Mirror(TreeNode root) {
if(root !=null){
Mirror1(root);
}
}

}