Java Lambda Expressions Hacker Rank Solution

Hello coders, In this post, you will learn how to solve Java Lambda Expressions Hacker Rank Solution. This problem is a part of the Java programming series. One more thing to add, don’t straight away look for the solutions, first try to solve the problems by yourself. If you find any difficulty after trying several times, then look for the solutions.

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Java Lambda Expressions Hacker Rank Solution
Java Lambda Expressions – Hacker Rank Solution

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Java Lambda Expressions Hacker Rank Solution


This Java 8 challenge tests your knowledge of Lambda expressions!

Write the following methods that return a lambda expression performing a specified action:

  1. PerformOperation isOdd(): The lambda expression must return True  if a number is odd or False if it is even.
  2. PerformOperation isPrime(): The lambda expression must return True   if a number is prime or False  if it is composite.
  3. PerformOperation isPalindrome(): The lambda expression must return True   if a number is a palindrome or False  if it is not.

Input Format

Input is handled for you by the locked stub code in your editor.

Output Format

The locked stub code in your editor will print  lines of output.

Sample Input

The first line contains an integer,  (the number of test cases).

The  subsequent lines each describe a test case in the form of  space-separated integers:
The first integer specifies the condition to check for ( for Odd/Even,  for Prime, or  for Palindrome). The second integer denotes the number to be checked.

1 4
2 5
3 898
1 3
2 12

Sample Output


Java Lambda Expressions Hacker Rank Solution

import java.util.*;
interface PerformOperation {
 boolean check(int a);
class MyMath {
 public static boolean checker(PerformOperation p, int num) {
  return p.check(num);
   PerformOperation isOdd()
       PerformOperation po = (int a)-> a%2 == 0 ? false : true;
       return po;
   PerformOperation isPrime()
       PerformOperation po = (int a)->
           if(a == 1) return true;
               for (int i =  2; i < Math.sqrt(a); i++)
                    if(a%i == 0) return false;
                return true;
       return po;
   PerformOperation isPalindrome()
       ArrayList<Integer> aa = new ArrayList<>();
       PerformOperation po = (int a)->
            String str = Integer.toString(a);
           String reverse = "";
           for(int i = str.length()-1; i >= 0; i--)
               reverse = reverse + str.charAt(i);
           if(reverse.equals(str)) return true;
           return false;
       return po;
public class Solution {
 public static void main(String[] args) throws IOException {
  MyMath ob = new MyMath();
  BufferedReader br = new BufferedReader(new InputStreamReader(;
  int T = Integer.parseInt(br.readLine());
  PerformOperation op;
  boolean ret = false;
  String ans = null;
  while (T--> 0) {
   String s = br.readLine().trim();
   StringTokenizer st = new StringTokenizer(s);
   int ch = Integer.parseInt(st.nextToken());
   int num = Integer.parseInt(st.nextToken());
   if (ch == 1) {
    op = ob.isOdd();
    ret = ob.checker(op, num);
    ans = (ret) ? "ODD" : "EVEN";
   } else if (ch == 2) {
    op = ob.isPrime();
    ret = ob.checker(op, num);
    ans = (ret) ? "PRIME" : "COMPOSITE";
   } else if (ch == 3) {
    op = ob.isPalindrome();
    ret = ob.checker(op, num);
    ans = (ret) ? "PALINDROME" : "NOT PALINDROME";

Disclaimer: The above Problem (Java Lambda Expressions ) is generated by Hackerrank but the Solution is Provided by Chase2Learn. This tutorial is only for Educational and Learning purposes. Authority if any of the queries regarding this post or website fill the following contact form thank you.


1. HackerRank Java All Problems Solutions

Hackerrank java problems solutions with practical program code examples and step-by-step full complete explanation.

2. Can HackerRank learn Java?

Welcome to the world of Java! In this challenge, we practice printing to stdout. The code stubs in your editor declare a Solution class and the main method. 

3. What is HackerRank Java test?

The HackerRank Skills Certification Test is a standardized assessment to help developers prove their coding skills.

4. Should I put HackerRank certificate on resume?

These certificates are useless, and you should not put them on your resume. The experience you gained from getting them is not useless. Use it to build a portfolio, and link to it on your resume. 

5. Can I retake HackerRank test?

The company which sent you the HackerRank Test invite owns your Test submissions and results. It’s their discretion to permit a reattempt for a particular Test. If you wish to retake the test, we recommend that you contact the concerned recruiter who invited you to the Test and request a re-invite

6. Can I learn Java per month?

you can’t master it in 1 month, it needs continuous hard work and experience. JAVA is a vast language even developers don’t know fully. you go in-depth about each particular class in java. Java is such a platform which have been used in all platform like android, web, and cloud so keep working on your interest. 

Where can I find HackerRank solutions in Java?

in this post you will get all the solutions of HackerRank java Problems.

Finally, we are now, in the end, I just want to conclude some important message for you

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