Java 8 lambda expression hello world

Lambda expression is used to provide the implementation of functional interface.

Java Lambda Expression Syntax

(argument-list) -> {function-body}

Where:
Argument-list: It can be empty or non-empty as well.
Arrow notation/lambda notation: It is used to link arguments-list and body of expression.
Function-body: It contains expressions and statements for lambda expression.

Example

package com.w3spoint;
 
@FunctionalInterface  
interface HelloWorld {
	String sayHello(String name);
}  
 
public class LambdaExpressionExample {
	public static void main(String args[]){
		HelloWorld helloWorld = (String name) -> { return "Hello " + name; };
		 System.out.println(helloWorld.sayHello("Jai"));
	}
}

Output

Hello Jai

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