Java

The challenge Modify the spacify function so that it returns the given string with spaces inserted between each character. The solution in Java code Option… Read More »How to Spacify a String in Java

The challenge Write a simple regex to validate a username. Allowed characters are: lowercase letters, numbers, underscore Length should be between 4 and 16 characters… Read More »How to Validate Usernames with Regex in Java

The challenge Given two arrays of strings a1 and a2 return a sorted array r in lexicographical order of the strings of a1 which are substrings of strings of a2. Example 1: a1 =… Read More »Sort Lexicographical Order of Substrings in Java

The challenge Your task is to add up letters to one letter. The function will be given an array of single-character Strings, each one being… Read More »How to Perform Alphabetical Addition in Java

The challenge You want to create secret messages which must be deciphered. Here are the conditions: Your message is a string containing space separated words.… Read More »How to Encrypt Words in Java

The challenge In this challenge, you have to write a method that folds a given array of integers by the middle x-times. An example says… Read More »How to Fold an Array in Java

The challenge Given a list lst and a number N, create a new list that contains each number of lst at most N times without… Read More »Delete Occurrences of an Element if it occurs more than N times in Java

The challenge Write a function that accepts a string, and returns true if it is in the form of a phone number.Assume that any integer… Read More »How to Validate Phone Numbers in 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