Find The Parity Outlier in Java
The challenge
You are given an array (which will have a length of at least 3, but could be very large) containing integers. The array is either …
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345 articles about java development, tools, and best practices
Find the missing letter using Java
The challenge
Write a method that takes an array of consecutive (increasing) letters as input and that returns the missing letter in the array.
You …
Read Article →Determine the order of braces is valid using Java
The challenge
Write a function that takes a string of braces, and determines if the order of the braces is valid. It should return true if the string …
[Solved] PKIX path building failed: unable to find valid certification path to requested target
The problem
It may happen to you that when you try and pull some Java dependencies, you will get the annoying PKIX path building failed: …
How to Find the odd int in Java
The challenge
Given an array of integers, find the one that appears an odd number of times.
There will always be only one integer that appears an odd …
Read Article →Count the number of Duplicates in Java
The challenge
Write a function that will return the count of distinct case-insensitive alphabetic characters and numeric digits that occur more than …
Read Article →Calculating Simple Max Digit Sum in Java
The challenge
In this challenge, you will be given an integer n and your task will be to return the largest integer that is <= n and has the …
The String Combat Challenge in Java
The challenge
After a long conflict, the rulers of Nek and Glo have decided that a final duel should decide the fate of their countries. Each ruler …
Read Article →Solving Single Word Pig Latin in Java
The challenge
Pig Latin is an English language game where the goal is to hide the meaning of a word from people not aware of the rules.
So, the goal …
Read Article →Count the Days in Java
The challenge
Little Annie is very excited for upcoming events. She want’s to know how many days she have to wait for a specific event.
Your job …
Read Article →Java HashMap Create or Increment Value
If you are using a HashMap to keep a running total of a series of elements, then you often need to increment a HashMap item, but if it doesn’t …
Get the Strongest even number in an interval in Java
The challenge
A strongness of an even number is the number of times we can successively divide by 2 until we reach an odd number starting with an even …
Read Article →What time is it? in Java
The challenge
How many times have we been asked this simple question in our daily lives by family, friends and strangers alike?
In this challenge you …
Read Article →Building a String Pyramid in Java
The challenge
You have to build a pyramid.
This pyramid should be built from characters from a given string.
You have to create the code for these …
Read Article →Cartesian coordinates from degree angle in Java
The challenge
Write a simple function that takes polar coordinates (an angle in degrees and a radius) and returns the equivalent cartesian coordinates …
Read Article →Sort array by sorting its smallest sub-array in Java
The challenge
Given an array of integers, arr, find out 2 indices m, n(0<=m<=arr.length-1, 0<=n<=arr.length-1, m<=n), so that as long …
Read Article →Excessively Abundant Numbers in Java
The challenge
An abundant number or excessive number is a number for which the sum of its proper divisors is greater than the number itself.
The …
Read Article →Unique Substring From Joined Strings in Java
The challenge
Write a function that takes two strings, A and B, and returns the length of the longest possible substring that can be formed from the …
Read Article →Converting from Base 10 to 16 (Decimal to Hex) in Java
The challenge
Convert an integer which is base 10, to a hexadecimal base 16 string.
Java provides various built-in options such as Integer.toString(a, …
String polynomial converter in Java
The challenge
Your task is to programe:
String convertToString(int[] pol) {....} The method returns given by a parameter, (integer array) which …
How to Remove all Exclamation Marks from a String in Java
The challenge
Write function RemoveExclamationMarks which removes all exclamation marks from a given string.
The solution in Java code
Option 1:
class …How to Convert a Number to a String in Java
The challenge
We need a function that can transform a number into a string.
What ways of achieving this do you know?
Examples: …
Read Article →How to Remove Spaces in a String in Java
The challenge
Simple, remove the spaces from the string, then return the resultant string.
The solution in Java code
class Solution {
static …How many stairs will Suzuki climb in 20 years? in Java
The challenge
Suzuki is a monk who climbs a large staircase to the monastery as part of a ritual. Some days he climbs more stairs than others …
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