How to Encrypt Words 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 …
Java
342 articles about java development, tools, and best practices
How to Fold an Array 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 more than a …
Read Article →Delete Occurrences of an Element if it occurs more than N times 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 reordering. For example if N …
Read Article →How to Validate Phone Numbers 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 from 0-9 in any …
How to Sort Array by Frequency 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. …
Read Article →How to Calculate String Rotation 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 first string …
Read Article →Compare Strings by Sum of Chars 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 …
How to Add Two Integers Without Arithmetic Operator in Java
The challenge
Given two integers a, b, find The sum of them, BUT You are not allowed to use the operators + and –
- The numbers (a,b) may be positive …
Counting Method VarArgs in Java
The challenge
Count how many arguments a method is called with.
Examples
args_count(1, 2, 3) -> 3
args_count(1, 2, 3, 10) -> 4
The solution in …
Read Article →How to Sum Consecutives 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 same …
Read Article →Replacing Occurences of Words 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 …
Convert String to LeetSpeak 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 …
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