JShell is a powerful interactive tool built into Java 9 and above. It lets you experiment with Java code line-by-line, evaluate expressions, and explore the language without setting up full projects. JShell is a REPL (Read Evaluate Print Loop) tool and run from the command line. This tutorial will guide you through the basics of …
Java Faker is a library used to generate fake data. It provides different classes and methods in order to generate real-looking data that ranges from mobile number, address, music, nation and many more. This is really helpful when we want to use some placeholder but don’t have actual data. For example, you want to generate …
An exception is nothing but an unwanted or unexpected event that occurs during the execution of a program. In such case, normal flow of the program is disturbed, and program terminates abnormally, which is not a good practice, therefore there is a need to handle these exceptions. Exception handling is a mechanism to handle runtime …
First things first A repository, also known as repo is nothing but collection of source code. It allows you to save versions of your code, which you can access when needed. Setting up a repository Initializing a new repository: git init git init command allows us to create a new repo. It is a one-time …
JWT stands for JSON Web Token. In simple words, it is an effective way of transmitting information between parties on internet. Let us first try to understand the purpose of tokens in general with an analogy of usage of tokens at some candy shop. You first pay for the items that you want to buy to the …
Optional was introduced in Java 8 and its primary objective is to prevent NullPointer exceptions in code. Consider it as wrapper/container object which may or may not hold a non-null value. One needs to unwrap/de-containerize it to get the actual content using methods provided by Optional itself. For example – method ‘isPresent‘ invoked on Optional …
