Welcome to the Java 8 tutorial! This guide will help you understand the key features and concepts of Java 8, which is a significant update to the Java programming language.

Key Features of Java 8

Java 8 introduced several new features that improved the language's performance, ease of use, and scalability. Here are some of the most notable features:

  • Lambda Expressions: Lambda expressions allow you to write more concise and readable code.
  • Stream API: The Stream API provides a high-level abstraction for collections, making it easier to perform operations on collections.
  • Default Methods: Default methods in interfaces allow you to add new methods to an existing interface without breaking existing implementations.
  • Date-Time API: The new Date-Time API provides a more intuitive and flexible way to handle date and time in Java.

Getting Started

Before you start learning Java 8, make sure you have the following prerequisites:

  • Java Development Kit (JDK) 8 or higher installed on your machine.
  • A text editor or Integrated Development Environment (IDE) to write and run Java code.

To get started, you can download the JDK from the official Oracle website.

Lambda Expressions

Lambda expressions are a concise way to represent an instance of an anonymous class. They are often used with the Stream API to perform operations on collections.

Here's an example of a lambda expression that filters even numbers from a list:

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

List<Integer> evenNumbers = numbers.stream()
                                  .filter(n -> n % 2 == 0)
                                  .collect(Collectors.toList());

System.out.println(evenNumbers);

Stream API

The Stream API provides a high-level abstraction for collections, making it easier to perform operations on collections. It supports various operations such as filtering, mapping, and reducing.

Here's an example of using the Stream API to calculate the sum of even numbers in a list:

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

int sum = numbers.stream()
                 .filter(n -> n % 2 == 0)
                 .mapToInt(Integer::intValue)
                 .sum();

System.out.println(sum);

Conclusion

Java 8 is a powerful and feature-rich version of the Java programming language. By learning Java 8, you'll be able to write more efficient and readable code. For more information on Java 8, you can visit our Java 8 documentation.

Java 8