Gemma Johnson is a Senior Contributor from the United Kingdom who writes guides, lists, and updates. Gemma's passion for video games began in the 90s, growing up with classic titles like Goldeneye, ...

Generics make your code more flexible and easier to read, and they help you avoid ClassCastExceptions at runtime. Get started with this introduction to using generics with the Java Collections ...

Java 23, now generally available, includes previews of module import declarations, stream gatherers, structured concurrency, scoped values, and a class-file API. And much more. Java Development Kit ...

Twenty-three years ago, in his Design Principles and Design Patterns article, Robert "Uncle Bob" Martin boiled down the Liskov substitution principle to the idea that "derived classes should be ...

Introduced with the Java 17 release, pattern matching enhances the instanceof operator so Java developers can better check and object's type and extract its components, and more efficiently deal with ...

Stool samples can help doctors diagnose some health conditions. Tips for collecting a stool sample include urinating before collecting the sample and using any tools that the sample kit provides.