java on Diogo Moreira

Sealed and Final in Java 17+

Sun, 18 Feb 2024 00:00:00 +0000

Java 17 brought the Sealed Classes feature, which allows greater control over how to structure a project’s class hierarchy. In this post, we’ll discuss this feature that permits classes and interfaces to have more control over their allowed subtypes.

The keywords sealed, non-sealed and permits are the ones to be used in the syntax of sealed classes in Java. When we mark a class as sealed, it is as if we were marking it as final, which does not allow other classes to extend it. So, we add classes that can extend a sealed class with the help of permits keyword and then we list the permitted classes.

Mocking Google Cloud Storage Objects with Java

Sun, 10 Dec 2023 00:00:00 +0000

Google Cloud Storage is widely used as a cloud storage service to allow users to store and retrieve objects. When working with it, it’s essential to write efficient unit tests to ensure the application behaves as expected.

Introduction

One common challenge in unit testing is dealing with external dependencies, that’s when we use mocks such as Blob Objects from Google Cloud Storage, which may not be readily available during testing or needs to be mocked due to pricing restrictions. This blog post will explore how to mock Blob Objects from Google Cloud Storage for efficient unit testing.