How to Use Java 8 in Java Programming

Java 8 is a widely used programming language that has been around for over two decades. It is used in many different industries, including finance, healthcare, and gaming. Java 8 is known for its simplicity, scalability, and security. However, with the release of Java 11 and 12, many developers have moved on to the newer versions. Nevertheless, Java 8 remains a vital language in software development, and in this article, we will explore how to use Java 8 in Java programming.

Table of Contents

Understanding Java 8

Before we dive into the specifics of Java 8, let’s first understand what it is. Java 8 is a programming language that was first released in March 2014. It is the eighth major release of the Java programming language and is known for introducing significant changes to the language.

One of the most notable changes in Java 8 is the introduction of functional programming paradigms. This means that Java 8 supports the use of lambda expressions, which allow developers to write more concise and readable code. Additionally, Java 8 also introduced the Stream API, which makes it easier to work with collections of data.

Setting up Java 8

To use Java 8 in your Java programming, you must first download and install the Java Development Kit (JDK) 8. You can do this by visiting the official Oracle website and downloading the appropriate JDK for your operating system.

Once you have downloaded and installed the JDK 8, you must set up your development environment to use Java 8. This involves configuring your IDE (Integrated Development Environment) to use the JDK 8.

Using Lambda Expressions

Lambda expressions are one of the most significant changes introduced in Java 8. They allow developers to write more concise and readable code. Lambda expressions are essentially anonymous functions that can be passed around like any other object.

To use lambda expressions in your Java programming, you must first understand the syntax. A lambda expression consists of three parts: the parameter list, the arrow operator, and the body.

Here’s an example of a lambda expression that takes two integers and returns their sum:

(int a, int b) -> a + b

The parameter list is (int a, int b), the arrow operator is ->, and the body is a + b.

Working with Streams

The Stream API is another significant change introduced in Java 8. Streams allow developers to work with collections of data in a more concise and functional way. Streams are designed to be used with lambda expressions, making it easy to write code that is both readable and efficient.

To use streams in your Java programming, you must first create a stream object from a collection. Once you have a stream object, you can perform various operations on it, such as filtering, mapping, and reducing.

Here’s an example of how to create a stream object from a list of integers and filter out the even numbers:

List numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
Stream stream =;
stream.filter(n -> n % 2 == 0).forEach(System.out::println);

This code creates a list of integers from 1 to 10, creates a stream object from the list, filters out the even numbers, and prints the remaining odd numbers.

Default Methods in Interfaces

Java 8 also introduced the concept of default methods in interfaces. Default methods are methods that have an implementation in the interface itself. This allows developers to add new methods to interfaces without breaking existing code that implements the interface.

Here’s an example of a default method in an interface:

public interface MyInterface {
    void doSomething();

    default void doSomethingElse() {
        System.out.println("Doing something else.");

This interface has two methods: doSomething() and doSomethingElse(). The doSomethingElse() method has a default implementation that prints out a message. If a class implements this interface but does not provide its own implementation of the doSomethingElse() method, it will use the default implementation provided in the interface.

Method References

Method references are another feature introduced in Java 8. Method references allow developers to refer to a method by its name without actually calling it. This can make code more readable and concise.

Here’s an example of a method reference:

List strings = Arrays.asList("foo", "bar", "baz");

This code creates a list of strings, then calls the forEach() method on the list. Rather than passing a lambda expression to the forEach() method, we pass a method reference System.out::println. This tells Java to call the println() method on the System.out object for each element in the list.


In conclusion, Java 8 is a powerful programming language that offers many new features and enhancements. Its support for functional programming paradigms, lambda expressions, and the Stream API make it a versatile and efficient language for software development.

To use Java 8 in your Java programming, you must first download and install the JDK 8 and set up your development environment to use it. Once you have done that, you can start using lambda expressions, streams, default methods in interfaces, and method references to write more concise and efficient code.

Overall, Java 8 is an excellent language for developers looking to write modern, robust, and scalable applications. With its many features and enhancements, it is sure to remain a vital language in the world of software development for years to come.

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