Find maximum (or minimum) in Binary Tree


Given a Binary Tree, find maximum(or minimum) element in it. For example, maximum in the following Binary Tree is 9.
1T






Code:

package trees;

public class N2017_findMaxOrMin {
   
    Node root;
   
    static class Node{
       
        int data;
        Node left, right;
       
        Node(int data){
           
            this.data = data;
           
            right = null;
            left = null;
           
        }
    }
   
    static int findMax(Node node){
       
        if(node == null){
            return Integer.MIN_VALUE;
        }
       
        int max = node.data;
        int left = findMax(node.left);
        int right = findMax(node.right);
       
        if(left > max){
            max = left;
        }
       
        if(right > max){
            max = right;
        }
       
        return max;
       
    }
   
    public static void main(String[] args){
       
       
        N2017_findMaxOrMin tree = new N2017_findMaxOrMin();
            tree.root = new Node(2);
            tree.root.left = new Node(7);
            tree.root.right = new Node(5);
            tree.root.left.right = new Node(6);
            tree.root.left.right.left = new Node(1);
            tree.root.left.right.right = new Node(11);
            tree.root.right.right = new Node(9);
            tree.root.right.right.left = new Node(4);
   
            System.out.println("Maximum element is " +
                           findMax(tree.root));
    }
   
   

}




Output:

Maximum element is 11

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