print leafs bt java

// http://code2begin.blogspot.com
// program to print the leaf nodes of a binary tree

/**
 * Created by MOHIT on 25-05-2018.
 */
import java.util.*;

// node class
class node{
    int data;
    node left;
    node right;

    // function that returns a pointer to new node
    public node(int element){
        this.data = element;
        this.left = null;
        this.right = null;

    }
};


public class BinaryTree {

    // function to print the leaf nodes of the binary tree
    static void print_leaves(node root){
        if (root != null){
            print_leaves(root.left);
            if(root.left == null && root.right == null){
                System.out.print(root.data + " ");
            }
            print_leaves(root.right);
        }
    }

    public static void main(String arg[]) {
        node head = new node(1);
        head.left = new node(2);
        head.right = new node(3);
        head.left.left = new node(4);
        head.left.right = new node(5);
        head.right.right = new node(6);
        head.left.left.right = new node(7);
        head.right.right.left = new node(8);
        head.left.left.right.left = new node(9);
        head.left.left.right.left.left = new node(10);
        head.right.right.left.right = new node(11);
        System.out.print("leaf nodes of the given tree are : ");
        print_leaves(head);
    }
}