Lambda Expressions In Java

Akshay Dev — Tue, 26 Dec 2023 12:49:19 +0000

In Java, a Lambda expression is like a shortcut for creating a small piece of code that does something specific. It's especially useful when you only need a quick function and don't want to write a whole method.

Imagine you have something called a "functional interface," which is just a special kind of interface in Java that has only one job to do. We call it "functional" because it's designed to perform a specific function.

Now, instead of writing a regular method and going through the whole process, Java 8 introduced Lambda expressions to make things quicker. It's a way to write a brief piece of code that takes some input, does something with it, and gives you a result.

(String name) -> { return "Hi"+name } Lambda Expression
This function takes one input parameter does some operations with it and returns the result.

A Sample Code With Explanation

It is an interface which has an abstract method to find the area of a rectangle.

public interface Rectangle {
void areaOfARectangle(int length, int width);
}

Main Function
public class LambdaExpressionExamples {

public static void main(String arg[]) {
//Without Using Lambda

Rectangle rectangle = new Rectangle() {
    @Override
    public void areaOfARectangle(int length, int width) {
        System.out.print("Area Of A Rectangle: "+length * 
                         width);
    }
};

rectangle.areaOfARectangle(5, 10);

//With Lambda

Rectangle rectangle1 = (int length, int width) -> {
    System.out.print("Area Of An Rectangle: "+length * 
                     width);
};

rectangle1.areaOfARectangle(10, 4);

}
}

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Lambda Expressions In Java