Java Program to Demonstrate Lambda Expressions

Problem Description

Write a Java program to demonstrate the usage of Lambda Expressions (introduced in Java 8).

Code

interface MyInterface {
    double getPiValue();
}

public class LambdaExample {
    public static void main(String[] args) {
        // declare a reference to MyInterface
        MyInterface ref;

        // lambda expression
        ref = () -> 3.1415;

        System.out.println("Value of Pi = " + ref.getPiValue());
    }
}

Output

Value of Pi = 3.1415

Explanation

1. Lambda Expression: A concise way to represent an anonymous function that can be passed around.
2. Syntax: (parameters) -> expression or (parameters) -> { statements; }.
3. Functional Interface: An interface with only one abstract method.