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 …Technical Articles
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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 …
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 …
Read Article →How to Calculate Age Range Compatibility as an Equation in Java
The challenge
Everybody knows the classic “half your age plus seven” dating rule that a lot of people follow (including myself). …
Read Article →How to Find the Longest Mountain in Array in Java
The challenge
Let’s call any (contiguous) subarray B (of A) a mountain if the following properties hold:
B.length >= 3- There exists some
0 …
How to tell what the CHMOD value of a file/directory is
chmod alters the permissions for a file or directory, you could allow full read/write access to a file or directory by running the following command: …
How to Solve the “Decode a String” Challenge in Java
The challenge
Given an encoded string, return its decoded string.
The encoding rule is: k[encoded_string], where the encoded_string inside the square …
How to cleanup a /var/log/journal in Linux
You may find your /var/log/journal directory taking up a lot of disk-space.
How do you go about removing, or deleting all these files under var log …
How to Find the Maximum Difference Between Node and Ancestor in Java
The challenge
Given the root of a binary tree, find the maximum value V for which there exist different nodes A and B where V = |A.val - B.val| and A …
How to Find the Integral using Java
The challenge
Create a function that finds the integral of the expression passed.
In order to find the integral all you need to do is add one to the …
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