How can I clear or empty a StringBuilder
You can use Java’s StringBuilder to create and manipulate Strings as follows:
StringBuilder sb = new StringBuilder(); …Java
342 articles about java development, tools, and best practices
How to Convert Array to String in Java
If you need to convert an array to a string in Java, then you could look at a solution like this:
String stringArray[] = {"Hello ", " …How to Base64 Encode a String in Java
Quick solution
In short, you can just do this:
new String(Base64.getEncoder().encode(bytes));
Examples and an explanation
In Java 8 and above, you …
Read Article →How to Generate a Random String in Java
Java provides many ways to generate random strings.
1. Using Apache Commons
public void generatingRandomAlphanumericString_ApacheCommons() { …How to Parse HTML/CSS Colors in Java
The challenge
In this challenge, you parse RGB colors represented by strings. The formats are primarily used in HTML and CSS. Your task is to …
Read Article →Solving Simple Transposition in Java
The challenge
Simple transposition is a basic and simple cryptography technique. We make 2 rows and put first a letter in Row 1, the second in Row 2, …
Read Article →The Difference of 2 in Java
The challenge
The objective is to return all pairs of integers from a given array of integers that have a difference of 2.
The resulting array should …
Read Article →How to Make the Deadfish Swim in Java
The challenge
Write a simple parser that will parse and run Deadfish.
Deadfish has 4 commands, each 1 character long:
iincrements the value …
How to Write Number in Expanded Form in Java
The challenge
You will be given a number and you will need to return it as a string in Expanded Form.
Examples:
Challenge.expandedForm(12); // Should …Is a Number Prime in Java
The challenge
Define a function that takes one integer argument and returns a logical value true or false depending on if the integer is a prime.
Per …
Read Article →How to Calculate Minutes to Midnight in Java
The challenge
Write a function minutesToMidnight(d) that will take a date object as the parameter. Return the number of minutes in the following …
Read Article →How to get the Sum of the First nth Term of a Series in Java
The challenge
Your task is to write a function that returns the sum of the following series up to nth term(parameter).
Series: 1 + 1/4 + 1/7 + 1/10 + …