Java String Introduction - HackerRank Solution with Explanation

Java String Introduction - Hacker Rank Solution

Hello Friends, How are you? Today I am going to solve the HackerRank Java String Introduction Problem with a very easy explanation. In this article, you will get more than one approach to solve this problem. So let's start-

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Java String Introduction - Hacker Rank Solution

HackerRank Java String Introduction - Problem Statement

"A string is traditionally a sequence of characters, either as a literal constant or as some kind of variable." — Wikipedia: String (computer science)

This exercise is to test your understanding of Java Strings. A sample String declaration:

String myString = "Hello World!" {codeBox}

The elements of a String are called characters. The number of characters in a string is called the length, and it can be retrieved with the String.length() method.

Given two strings of lowercase English letters, A and B, perform the following operations:
  1. Sum the lengths of A and B.
  2. Determine if A is lexicographically larger than B (i.e.: does B come before A in the dictionary?).
  3. Capitalize the first letter in A and B and print them on a single line, separated by a space.

Input Format

The first line contains a string A. The second line contains another string B. The strings are comprised of only lowercase English letters.

Output Format

There are three lines of output:
For the first line, sum the lengths A of and B.
For the second line, write Yes if A is lexicographically greater than B otherwise print No instead.
For the third line, capitalize the first letter in both A and B and print them on a single line, separated by a space.

Sample Input

hello java {codeBox}

Sample Output

9 No Hello Java {codeBox}


String A is "hello" and B is "java".

A has a length of 5, and B has a length of 4; the sum of their lengths is 9.
When sorted alphabetically/lexicographically, "hello" precedes "java"; therefore, A is not greater than B and the answer is No.

When you capitalize the first letter of both A and B and then print them separated by a space, you get "Hello Java".

Java String Introduction - Hacker Rank Solution

Approach I:

import java.util.Scanner;

public class Solution {
    public static void main(String[] args) {
        /* Save input */
        Scanner scan = new Scanner(;
        String A =;
        String B =;
        /* Sum lengths */
        System.out.println(A.length() + B.length());

        /* Compare lexicographical ordering */
        System.out.println(A.compareTo(B) > 0 ? "Yes" : "No");
        /* Print the Strings in desired format */
        System.out.println(capFirstLetter(A) + " " + capFirstLetter(B));
    private static String capFirstLetter(String str) {
        if (str == null || str.length() == 0) {
            return "";
        } else {
            return str.substring(0,1).toUpperCase() + str.substring(1);

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

I hope you have understood the solution to this HackerRank Problem. All these four solutions will pass all the test cases. Now visit Java String Introduction HackerRank Problem and try to solve it again.

All the Best!

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