CalculatorImpl.java

package com.javatechie.lambda.demo;

interface Calculator {

	// void switchOn();

	/* void sum(int input); */

	int substract(int i1, int i2);
}

public class CalculatorImpl {

	public static void main(String[] args) {

		/*
		 * Calculator calculator = () -> System.out.println("Switch On");
		 * 
		 * calculator.switchOn();
		 */

		/*
		 * Calculator calculator = (input) -> System.out.println("Sum : " + input);
		 * calculator.sum(394);
		 */

		Calculator calculator = (i1, i2) -> {
			if (i2 < i1) {
				throw new RuntimeException("message");
			} else {
				return i2 - i1;
			}
		};

		System.out.println(calculator.substract(8, 20));
	}

	// () -> {body};
}