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 …
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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 …
Read Article →How to Loop and Combine Three Strings in Java
The challenge
Create a function that will return a string that combines all of the letters of the three inputed strings in groups. Taking the first …
Read Article →How to Localize The Barycenter of a Triangle in Java
The challenge
The medians of a triangle are the segments that unit the vertices with the midpoint of their opposite sides. The three medians of a …
Read Article →How to Calculate a Valid Square in Java
The challenge
Given the coordinates of four points in 2D space p1, p2, p3 and p4, return true if the four points construct a square.
The coordinate of …
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