N18_二叉树的镜像

package new_offer;
/**
 * 操作给定的二叉树，将其变换为源二叉树的镜像。
 * @author Sonya
 *思路：递归调用
 */
public class N18_Mirror {
   public void Mirror(TreeNode root) {
	   //TreeNode temp;
        if(root!=null) {
        	TreeNode temp=null;
        	temp=root.left;
        	root.left=root.right;
        	root.right=temp;
        	if(root.left!=null) {Mirror(root.left);}
        	if(root.right!=null) {Mirror(root.right);}
        }
    }
   public void print(TreeNode root) {
	   System.out.print(root.val);
	   if(root.left!=null) {print(root.left);}
	   if(root.right!=null){print(root.right);}
   }

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		TreeNode t1,t2,t3,t4,t5,t6;
		t1=new TreeNode(1);t2=new TreeNode(2);t3=new TreeNode(3);
		t4=new TreeNode(4);t5=new TreeNode(5);t6=new TreeNode(6);
		t1.left=t2;t1.right=t3;
		t2.left=t4;t2.right=t5;
		t3.left=t3.right=null;
		t4.left=t6;t4.right=null;
		t5.left=t5.right=null;
		t6.left=t6.right=null;
		N18_Mirror n18=new N18_Mirror();
		n18.print(t1);
      System.out.println("            ");
      n18.Mirror(t1);
      n18.print(t1);
	}

}