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The Java Interview Handbook: 300+ Interview Questions

Lambda Expressions Basics

Explore the basics of lambda expressions in Java to understand how to write concise functional interfaces and replace verbose anonymous classes. Learn syntax variations, parameter rules, and how lambdas improve expressiveness for functional programming in modern Java.

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Lambda expressions were introduced to increase the expressiveness of the Java language. They allow us to treat functionality as a method argument or treat code as data.

Let’s explore the fundamentals of writing and using Lambda expressions in modern technical interviews.

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What are Lambda expressions?

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Let’s see how a traditional anonymous class compares to a Lambda expression.

Java
interface Task {
    void execute();
}
class Program {
    public static void main(String[] args) {
        Task oldTask = new Task() {
            @Override
            public void execute() {
                System.out.println("Running via anonymous class");
            }
        };
        Task newTask = () -> System.out.println("Running via lambda expression");
        oldTask.execute();
        newTask.execute();
    }
}
    ...