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BinryTree Traversal preorder return preorder Expression as String

P: 7

I have problem with following method that we used for BinryTree Traversal. The follow method is good so far.

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  1. public void preorderHelper(MyBinaryTreeNode rt){
  2.  if(rt==null)
  3.  return;
  4.  System.out.print(" ";
  5.  preorderHelper(rt.left);
  6.  preorderHelper(rt.right); 
  7. }

Now I have to change this method in such a way that it will return String(which will contains preorder expression).

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  1. public String preorderHelper(MyBinaryTreeNode rt){
  2.   /*
  4.  ??????????
  5.  */
  6. }

Any Idea. Thank you in Advance.
Apr 23 '12 #1
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