Java 8 Core Features

Java 8 introduced numerous new features, among which the most important include:

1. Lambda Expressions: A lambda expression is an anonymous function that can be passed as a parameter to other methods or functions. They simplify code and make it more readable and maintainable.
2. Method References: Method references are a more concise form of Lambda expressions, allowing developers to invoke existing methods without having to rewrite them again.
3. Stream API: The Stream API provides a simpler and more direct way to manipulate collection and array data. It helps developers handle large volumes of data with greater ease.
4. Default Methods: Default methods are a new feature in interfaces that allow specific implementations to be defined within an interface, making it more flexible and easier to extend.
5. Time Date API: Java 8 introduced a new time date API, which replaces the old Date and Calendar classes. The new API is simpler and easier to use while offering more functionality and flexibility.
6. Concurrency Library Improvements: Java 8 improved its concurrency library with new classes such as ConcurrentHashMap and CompletableFuture, making it easier for developers to handle concurrent issues.