Check to see if the tree is balanced.

Tree.java

package com.example.tree;
import com.example.Node;
// Tree is balanced when the difference between maximum and minimum height is <= 1.
public class Tree{

	public static void main(String args[]){
		Node root = new Node();
		if(checkTreeBalance(root))
			System.out.println("Its a balanced tree");
		else
			System.out.println("Its not a balanced tree");
	}

	public static boolean checkTreeBalance(Node root){
		return (maxHeight(root) - minHeight(root)) <= 1 ;
	}

	public static int maxHeight(Node root){
		if(root == null)
			return 0;

		return  1 + Math.max(maxHeight(root.getLeft()),maxHeight(root.getRight())); 
	}

	public static int minHeight(Node root){
		if(root == null)
			return 0;

		return 1 + Math.min(minHeight(root.getLeft()),minHeight(root.getRight()));

	}

}