What is Lambda Expression in Java 8

Lambda Expression:- A Lambda Expression in Java 8 is a short and clear way to provide the implementation of a functional interface . It reduces boilerplate code and makes programs easier to read. In this example, we use a lambda expression to print a message in Java.

Print Hello World Using Lambda Expression in Java 8 :-

  • PrintHello is a functional interface because it contains only one abstract method .
  • The print() method is used to display a message.
  • First, the interface method is implemented using an anonymous inner class.
  • Then, the same method is implemented using a lambda expression.
  • When the print() method is called, the message is displayed on the console.
				
					interface PrintHello {
	public void print();
}

public class CountChar {
	public static void main(String[] args) {
		
		// anonymous inner class
		PrintHello test = new PrintHello() {
			public void print() {
				System.out.println("printing from anonymous inner class");
			}
		};
		test.print();

		// using a lambda expression
		PrintHello hello = () -> {
			System.out.println("Hello from lambda expression");
		};
		hello.print();
	}
}

Output:-
printing from anonymous inner class
Hello from lambda expression

FAQ :
Can I print Hello World using lambda expression in Java?
Yes, you can print Hello World using a lambda expression by implementing a functional interface method.
What is the difference between anonymous class and lambda expression?
An anonymous class uses more code, while a lambda expression provides a shorter and cleaner syntax.

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