Write cohesive classes and methods Cohesive code does one thing very well. Although writing cohesive classes and methods is a simple concept, even experienced developers don’t follow it very well.

Thus, there is no hard and fast rule about Java class size. Use your best judgment to decide how large to make your classes, based on the context in which you work. If you write a short Java program, ...

Learn how to write and validate unit tests with JUnit 5. This article shows you how to configure a Maven project for JUnit, write basic and parameterized unit tests, and use JUnit 5’s built-in ...

Java is one of the most in-demand programming languages in the world and one of the two official programming languages used in Android development (the other being Kotlin). Developers familiar ...

Sealed classes make Java an even more powerful and expressive language and set the stage for even more sophisticated techniques such as pattern matching, which we'll explore in a subsequent article. A ...

The Java input/output (I/O) facilities provide a simple, standardized API for reading and writing character and byte data from various data sources. This article explores the I/O classes ...