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 …
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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, …
How to Format Numbers by Prepending 0 to single-digit numbers in Javascript
If you have a single-digit number, and you need to format it to always have at-least two digits, then you can use the below function to solve your …
Read Article →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 …
Read Article →Determine if N is divisible by X and Y in Java
The challenge
Create a function that checks if a number n is divisible by two numbers x AND y. All inputs are positive, non-zero digits.
Examples
1) n …How to Sum a Mixed Array in Java
The challenge
Given an array of integers as strings and numbers, return the sum of the array values as if all were numbers.
Return your answer as a …
Read Article →Calculate the Volume of a Cuboid in Java
A Cuboid is a geometric object that is more or less cubic in shape. It is a solid which has six rectangular faces at right angles to each other.
The …
Read Article →Find the first non-consecutive number in Java
The challenge
Your task is to find the first element of an array that is not consecutive.
By not consecutive we mean not exactly 1 larger than the …
Read Article →Alternating String Casing in Java
The challenge
altERnaTIng cAsE <=> ALTerNAtiNG CaSe
Define String.prototype.toAlternatingCase (or a similar function/method such as …
Solving the Pythagorean Triple in Java
The challenge
Given an array of 3 integers a, b and c, determine if they form a pythagorean triple.
A pythagorean triple is formed when:
c2 = a2 + b2 …
Read Article →How to Correct the Mistakes of the Character Recognition Software in Java
The challenge
Character recognition software is widely used to digitise printed texts. Thus the texts can be edited, searched and stored on a …
Read Article →Solving “Duck Duck Goose” in Java
The challenge
The objective of Duck, duck, goose is to walk in a circle, tapping on each player’s head until one is chosen.
Task: Given an array …
Read Article →Calculate averages from an int array in Java
The challenge
Write function avg which calculates average of numbers in given list.
The solution in Java code
Option 1 (working through the problem): …
Read Article →How to Rotate a String in Java
Rotating a String in Java is a common interview question, and albeit it quite a simple one, it tests many fundamental concepts. Did I mention that it …
Calculate the Sum without highest and lowest number in Java
The challenge
Sum all the numbers of the array except the highest and the lowest element (the value, not the index!).
(The highest/lowest element is …
How to Convert a String to an Array in Java
Java makes it easy to convert a string to an array by providing the built-in .split() method on the String object.
The challenge
Write a function to …
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