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March 14, 2023 by Sergey Kargopolov

Micrometer and Zipkin: How to Trace HTTP Requests in Spring Boot 3

In a microservices architecture, it is common to have multiple services communicating with each other over the network. This distributed nature of the architecture can make it challenging to diagnose and debug issues when they arise. To address this problem, developers often use monitoring(Micrometer) and tracing tools(Zipkin) to track the flow of requests between microservices.…

March 13, 2023 by Siddhartha Verma 0 comments

Image with Rounded Corners in Flutter

In this tutorial, we will explore one of the many ways to display images in Flutter. Specifically, we will learn how to create an image with rounded corners, a popular design element in modern mobile applications. Before diving into the main topic, it is important to note that Flutter offers a variety of options for…

March 13, 2023 by Sergey Kargopolov 0 comments

Removing the DEBUG Banner in Flutter App

In this tutorial, you will learn how to remove the DEBUG banner in the Flutter app. Removing the DEBUG banner is crucial for ensuring that your Flutter mobile application looks polished and production-ready. It’s also important to note that this label can be misleading to users who may mistake it for an error or bug…

March 13, 2023 by alegru 0 comments

Comparator interface in Java

class UserIdComparator implements Comparator<User> { public int compare(User user1, User user2) { if (user1.userId == user2.userId) { return 0; } else if (user1.userId > user2.userId) { return 1; } else { return -1; } } } We will now create a UsernameComparator class that establishes the comparison logic based on the username field. This class…

March 13, 2023 by alegru 0 comments

Java Switch Expressions

Output: The color is blue. Now, this can be written like this: class Test { public static void main(String[] args) { String color = “blue”; switch (color) { case “white” -> System.out.println(“The color is white.”); case “yellow” -> System.out.println(“The color is yellow.”); case “blue” -> System.out.println(“The color is blue.”); case “green” -> System.out.println(“The color is…

March 13, 2023 by Jatin Hemnani 0 comments

Creating a Splash Screen in Flutter

In this tutorial, you will learn how to create a Splash Screen in your Flutter mobile application. What is a Splash Screen? The splash screen is an introductory screen that displays a company’s logo or tagline. A plain white screen can make the app seem unprofessional, so it’s important to create a splash screen for your Flutter-built…

March 13, 2023 by alegru 0 comments

Object Class in Java

Output: true true true As you can see, the Car class inherits the Vehicle class, which is itself an instance of the Object class. Similarly, the Car class is an instance of both the Vehicle and the Object class. In Java, all classes inherit some useful methods from the Object class, which we will discuss…

March 11, 2023 by Misbah Shaukat

Rename Columns in Pandas DataFrame: Explained

In this tutorial, you will learn how to rename columns in Pandas DataFrame. In a nutshell, Pandas is a popular data analysis and manipulation library in Python. It provides powerful tools for reading, writing, filtering, and transforming data in a variety of formats, such as CSV, Excel, and SQL databases. If you want to learn how…

March 11, 2023 by alegru 0 comments

Reverse a String in Java

Reversing a string is a common task in Java programming, and there are several ways to accomplish this. In this tutorial, we’ll explore four different methods for reversing a string in Java, using the StringBuilder class, the for loop, recursion, and a character array. We’ll provide examples of each method and explain how they work.…

March 10, 2023 by Sergey Kargopolov 0 comments

Generate JWT. Add and Validate Custom Claims.

In this tutorial, you will be introduced to the process of adding JSON Web Token (JWT) support to your Java application. You will also learn how to add and validate custom JWT Claims using the io.jsonwebtoken library. The JWT tokens generated in this process will be signed with a SecretKeySpec, making them secure and tamper-proof.…

March 10, 2023 by Sergey Kargopolov 0 comments

Spring RestTemplate Tutorial

The RestTemplate class within the Spring Framework is a simple HTTP client that enables your code to send HTTP requests and handle HTTP responses. This tutorial will demonstrate how to use RestTemplate to send various types of HTTP requests. Create Spring Boot App RestTemplate is a component of the Spring Framework and is typically utilized…

March 10, 2023 by Sergey Kargopolov

Enable OpenAPI 3(Swagger) in Spring Boot 3

OpenAPI (formerly known as Swagger) is a specification for building and documenting RESTful APIs. It allows developers to describe their API operations, inputs, outputs, and other aspects in a structured and machine-readable format. This documentation can then be used by developers and users to understand and interact with the API. In Spring Boot applications, OpenAPI…

March 9, 2023 by Sergey Kargopolov 0 comments

@PutMapping in Spring Boot REST

In this tutorial, you’ll learn how to use the @PutMapping annotation in your RESTful web services app to handle HTTP PUT requests with a JSON or XML payload. This allows you to update user details, for example. Here’s an example CURL command to send an HTTP PUT request with JSON data containing user details: HTTP…

March 9, 2023 by Zlatko Nikoloski

Checkbox Example In Flutter

In this tutorial, we will explore various ways to implement a Checkbox in Flutter. A Checkbox is a type of widget that holds a boolean value. The two widgets that we will cover in this tutorial are: Checkbox CheckboxListTile Checkbox In the code example below, we have used the Checkbox widget as a child of…

March 9, 2023 by alegru 0 comments

Method Overloading in Java

public int sum(int a, int b, int c) { // body of the method } class Printer { // fields public void printBook(String bookName) { // … } public void printBook(String bookName, int numberOfPages) { // … } } class Printer { // fields public void printBook(String bookName) { // … } public String printBook(String…