Everything you need to know to Master API Creation
Introduction to APIs
An API (Application Programming Interface) is a set of rules and protocols that allows different software applications to …
Read Article →Java
342 articles about java development, tools, and best practices
Programming Languages Compared: Python, Rust, Go, Java & More (2023 Series)
1. Introduction
Welcome to our Programming Languages Series! In this series, we’ll explore various programming languages, understand their …
Read Article →Python vs Java Performance: Programming Powerhouses
In the vast landscape of programming languages, Python and Java have emerged as titans, offering robust solutions for a wide range of applications. …
Read Article →How to learn Java in 1 day
Learning Java in one day is not a realistic goal, as Java is a complex programming language that requires time and practice to master. However, here …
Read Article →How to Find the nth Reverse Number in Java
The challenge
Reverse Number is a number which is the same when reversed.
For example, the first 20 Reverse Numbers are:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, …How to Find the Sum of Intervals in Java
The challenge
Write a function called sumIntervals/sum_intervals() that accepts an array of intervals, and returns the sum of all the interval …
How to Compile Multiple Java Files from a Single Command in Java
If you need to compile multiple Java files using a single command, then you can do the following.
First, it’s good to learn how to compile a …
Read Article →How to Convert JSON to a Java Object
If you need to convert JSON to a Java Object, then you can do one of the following:
Option 1 – Using Gson
import com.google.gson.Gson;
public class …How to Calculate Powers of Integers in Java
If you need to calculate the powers of Integers in Java, then you can do one of the following:
Option 1 – Using for loops
public class Power { …How to Get Today’s Date in Java
If you need to get today’s date in Java, then you can do one of the following:
Option 1 – Using LocalDate
import java.time.LocalDate;
public …How to Make a Java Jar File Executable
Let’s say you have a Java project as follows:
package ms.ao.something;
public class MyProject {
public static void main(String...args) …How to Read a File Line by Line in Java
If you need to read a file line by line in Java, then you can use one of the following three (3) options.
Option 1
You can use the FileReader and …
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(); …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 + …