Java Program to Implement Binary Tree Data Structure

To understand this example, you should have the knowledge of the following Java programming topics:

Example: Java Program to Implement Binary Tree

// class to create nodes
class Node {
  int key;
  Node left, right;

  public Node(int item) {
  key = item;
  left = right = null;

class BinaryTree {
  Node root;

  // Traverse tree
  public void traverseTree(Node node) {
    if (node != null) {
      System.out.print(" " + node.key);

  public static void main(String[] args) {

    // create an object of BinaryTree
    BinaryTree tree = new BinaryTree();

    // create nodes of the tree
    tree.root = new Node(1);
    tree.root.left = new Node(2);
    tree.root.right = new Node(3);
    tree.root.left.left = new Node(4);

    System.out.print("\nBinary Tree: ");


Binary Tree:  4 2 1 3
Binary tree implementation in Java with 4 nodes
Binary Tree Output

In the above example, we have implemented the binary tree in Java. Unlike other data structures, Java doesn't provide a built-in class for trees.

Here, we have created our own class of BinaryTree. To learn about the binary tree, visit Binary Tree Data Structure.

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