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Question of the Day for 6/3/2026

Subject: Java

Consider the following incomplete method hasTwoChild which should return true when at least one node in the tree has two children.


private boolean hasTwoChild(TreeNode node)
{
   if (node == null)
      return false;
   
   TreeNode leftNode = node.getLeft();
   TreeNode rightNode = node.getRight();

   if (leftNode != null) && (rightNode != null)
      return true;
   else 
      return /* missing code */;
}

Which of the following can be used to replace /* missing code */ so that the method hasTwoChild will work as intended?

(hasTwoChild(leftNode) || hasTwoChild(rightNode))
(hasTwoChild(leftNode) || hasTwoChild(leftNode))
false
true
(hasTwoChild(leftNode) && hasTwoChild(rightNode))

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