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in java I need help with making a preorder traversal method in a binary search tree, It uses recursion and the code is down below  private void preorder(BSTNode current, ArrayList preorderKeys) {         if (current == null) {             return;         }         preorderKeys.add(current.getKey());         preorderKeys.add((E) current.getLeftChild());         preorderKeys.add((E) current.getRightChild());     }   its supposed to look something like this preorder(node):  if node is null: return  visit node  preorder(node.left)  preorder(node.right)

in java I need help with making a preorder traversal method in a binary search tree, It uses recursion and the code is down below  private void preorder(BSTNode current, ArrayList preorderKeys) {         if (current == null) {             return;         }         preorderKeys.add(current.getKey());         preorderKeys.add((E) current.getLeftChild());         preorderKeys.add((E) current.getRightChild());     }   its supposed to look something like this preorder(node):  if node is null: return  visit node  preorder(node.left)  preorder(node.right)

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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in java

I need help with making a preorder traversal method in a binary search tree, It uses recursion and the code is down below 

private void preorder(BSTNode<E> current, ArrayList<E> preorderKeys) {
        if (current == null) {
            return;
        }
        preorderKeys.add(current.getKey());
        preorderKeys.add((E) current.getLeftChild());
        preorderKeys.add((E) current.getRightChild());
    }

 

its supposed to look something like this

preorder(node):
 if node is null: return
 visit node
 preorder(node.left)
 preorder(node.right)

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