Java

The challenge Sort elements in an array by decreasing frequency of elements. If two elements have the same frequency, sort them by increasing value. The… Read More »How to Sort Array by Frequency in Java

The challenge Write a function that receives two strings and returns n, where n is equal to the number of characters we should shift the… Read More »How to Calculate String Rotation in Java

The challenge Compare two strings by comparing the sum of their values (ASCII character code). For comparing treat all letters as UpperCase null should be treated… Read More »Compare Strings by Sum of Chars in Java

The challenge Given two integers a, b, find The sum of them, BUT You are not allowed to use the operators + and – Notes The numbers (a,b) may be positive… Read More »How to Add Two Integers Without Arithmetic Operator in Java

The challenge Count how many arguments a method is called with. Examples The solution in Java code Some languages refer to this as the spread… Read More »Counting Method VarArgs in Java

The challenge You are given a list/array which contains only integers (positive and negative). Your job is to sum only the numbers that are the… Read More »How to Sum Consecutives in Java

The challenge You are given a string. You must replace any occurrence of the sequence coverage by covfefe, however, if you don’t find the word coverage in the string, you… Read More »Replacing Occurences of Words in Java

The challenge Your task is to write a function toLeetSpeak that converts a regular english sentence to Leetspeak. More about LeetSpeak You can read at wiki -> https://en.wikipedia.org/wiki/Leet… Read More »Convert String to LeetSpeak in Java

The challenge Given a credit card number we can determine who the issuer/vendor is with a few basic knowns. Complete the function getIssuer() that will use the… Read More »Credit Card Issuer Checking in Java

The challenge Complete the function to find the count of the most frequent item of an array. You can assume that input is an array… Read More »Find Count of Most Frequent Item in an Array in Java

The challenge Given an array/list [] of integers, Find the Nth smallest element in this array of integers Notes Array/list size is at least 3 . Array/list’s numbers could be a mixture of positives… Read More »Return Nth Smallest Element in Java

The challenge Split a given string into different strings of equal size. Example: Assumptions: The solution in Java code Option 1: Option 2: Option 3:… Read More »Split String into Parts in Java

The challenge Check to see if a string has the same amount of ‘x’s and ‘o’s. The method must return a boolean and be case… Read More »Exes and Ohs in Java

The challenge Given two numbers and an arithmetic operator (the name of it, as a string), return the result of the two numbers having that… Read More »How to make an arithmetic function in Java

You’ve built a Java project and packaged a .jar file. You are ready to run it outside your IDE, or deploy it somewhere. When you… Read More »[Solved] No main manifest attribute Solution for Jar/Maven/Gradle/Spring Boot