hacker rank Java programming solutions

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6 min readNov 11, 2021

Java Exception Handling - Hacker Rank Solution

You are required to compute the power of a number by implementing a calculator. Create a class MyCalculator which…

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Valid Username Regular Expression - Hacker Rank Solution

You are updating the username policy on your company's internal networking platform. According to the policy, a…

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Java Hashset- Hacker Rank Solution

In computer science, a set is an abstract data type that can store certain values, without any particular order, and no…

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Java SHA 256 - Hacker Rank Solution

Cryptographic hash functions are mathematical operations run on digital data; by comparing the computed hash (i.e., the…

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Java MD5 - Hacker Rank Solution

MD5 ( Message-Digest algorithm 5) is a widely-used cryptographic hash function with a 128-bit hash value. Here are some…

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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…

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Covariant Return Types - Hacker Rank Solution

Java allows for Covariant Return Types, which means you can vary your return type as long you are returning a subclass…

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Java Annotations - Hacker Rank Solution

Java annotation can be used to define the metadata of a Java class or class element. We can use Java annotation at the…

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Java Visitor Pattern - Hacker Rank Solution

Note: In this problem you must NOT generate any output on your own. Any such solution will be considered as being…

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Java Singleton Pattern - Hacker Rank Solution

"The singleton pattern is a design pattern that restricts the instantiation of a class to one object. This is useful…

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Java Factory Pattern - Hacker Rank Solution

According to Wikipedia, a factory is simply an object that returns another object from some other method call, which is…

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Prime Checker - Hacker Rank Solution

You are given a class Solution and its main method in the editor. Your task is to create a class Prime. The class Prime…

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Java Reflection Attributes - Hacker Rank Solution

JAVA reflection is a very powerful tool to inspect the attributes of a class in runtime. For example, we can retrieve…

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Java Varargs Simple Addition - Hacker Rank Solution

You are given a class Solution and its main method in the editor.Your task is to create the class Add and the required…

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Java Exception Handling Try-catch - Hacker Rank Solution

Exception handling is the process of responding to the occurrence, during computation, of exceptions - anomalous or…

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Java Iterator - Hacker Rank Solution

Java Iterator class can help you to iterate through every element in a collection. Here is a simple example: import…

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Java Instanceof keyword - Hacker Rank Solution

The Java instanceof operator is used to test if the object or instance is an instanceof the specified type. In this…

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Java Method Overriding 2 - Hacker Rank Solution

When a method in a subclass overrides a method in superclass, it is still possible to call the overridden method using…

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Java Method Overriding - Hacker Rank Solution

When a subclass inherits from a superclass, it also inherits its methods; however, it can also override the superclass…

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Java Priority Queue - Hacker Rank Solution

In computer science, a priority queue is an abstract data type which is like a regular queue, but where additionally…

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Java BitSet- Hacker Rank Solution

Java's BitSet class implements a vector of bit values (i.e.: () or ()) that grows as needed, allowing us to easily…

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Java Dequeue - Hacker Rank Solution

In computer science, a double-ended queue (dequeue, often abbreviated to deque, pronounced deck) is an abstract data…

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Java Sort- Hacker Rank Solution

You are given a list of student information: ID, FirstName, and CGPA. Your task is to rearrange them according to their…

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Java Comparator - Hacker Rank Solution

Comparators are used to compare two objects. In this challenge, you'll create a comparator and use it to sort an array…

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Java Stack - Hacker Rank Solution

In computer science, a stack or LIFO (last in, first out) is an abstract data type that serves as a collection of…

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Java Map- Hacker Rank Solution

You are given a phone book that consists of people's names and their phone number. After that you will be given some…

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Java List - Hacker Rank Solution

For this problem, we have types of queries you can perform on a List: Insert at index :Insert x y Delete the element at…

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Java 1D Array (Part 2) - Hacker Rank Solution

Let's play a game on an array! You're standing at index of an -element array named . From some index (where ), you can…

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Java Arraylist - Hacker Rank Solution

Sometimes it's better to use dynamic size arrays. Java's Arraylist can provide you this feature. Try to solve this…

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Java 2D Array - Hacker Rank Solution

You are given a 6 * 6 2D array. An hourglass in an array is a portion shaped like this: 1 1 1 0 0 0 0 1 0 0 0 0 1 1 1 0…

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Java 1D Array - Hacker Rank Solution

An array is a simple data structure used to store a collection of data in a contiguous block of memory. Each element in…

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Java BigInteger - Hacker Rank Solution

In this problem, you have to add and multiply huge numbers! These numbers are so big that you can't contain them in any…

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Java Primality Test - Hacker Rank Solution

A prime number is a natural number greater than whose only positive divisors are and itself. For example, the first six…

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Java BigDecimal - Hacker Rank Solution

Java's BigDecimal class can handle arbitrary-precision signed decimal numbers. Let's test your knowledge of them! Given…

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Java Regex 2 - Hacker Rank Solution

In this challenge, we use regular expressions (RegEx) to remove instances of words that are repeated more than once…

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Java Regex - Hacker Rank Solution

Write a class called MyRegex which will contain a string pattern. You need to write a regular expression and assign it…

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Java String Tokens - Hacker Rank Solution

Given a string,8 , matching the regular expression [A-Za-z !,?._'@]+, split the string into tokens. We define a token…

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Java Anagrams - Hacker Rank Solution

Two strings, a and b, are called anagrams if they contain all the same characters in the same frequencies. For this…

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Java String Reverse - Hacker Rank Solution

A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward or forward. Given…

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Java Substring Comparisons - Hacker Rank Solution

We define the following terms: Lexicographical Order, also known as alphabetic or dictionary order, orders characters…

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Java Substring - Hacker Rank Solution

Given a string,8 , and two indices, start and end, print a substring consisting of all characters in the inclusive…

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Java Strings Introduction - Hacker Rank Solution

"A string is traditionally a sequence of characters, either as a literal constant or as some kind of variable. This…

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Java Currency Formatter - Hacker Rank Solution

Given a double-precision number,payment, denoting an amount of money, use the NumberFormat class' getCurrencyInstance…

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Java Date and Time - Hacker Rank Solution

The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a…

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Java Static Initializer Block - Hacker Rank Solution

Static initialization blocks are executed when the class is loaded, and you can initialize static variables in those…

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Java Loops I - Hacker Rank Solution

In this challenge, we're going to use loops to help us do some simple math. Task Given an integer, N , print its first…

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Java Stdin and Stdout II in Java - Hacker Rank Solution

In this challenge, you must read an integer, a double, and a String from stdin, then print the values according to the…

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Java Loops II - Hacker Rank Solution Java

Problem Statement Sample Input : Sample Output : import java.util.; import java.io.; class Solution { public static…

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Java Output Formatting - Hacker Rank Solution

Java's System.out.printf function can be used to print formatted output. The purpose of this exercise is to test your…

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Java If-Else - Hacker Rank Solution

In this challenge, we test your knowledge of using if-else conditional statements to automate decision-making…

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Java Stdin and Stdout I - Hacker Rank Solution

Most HackerRank challenges require you to read input from stdin (standard input) and write output to stdout (standard…

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