Creating a new custom functional interface

Lambdas_03.java

package com.ucguy4u.functional.java;
/**
 * @author chauhanuday
 */
public class Lambdas_03 {

	public static void main(String[] args) {
		// example of passing multiple values to a method using lambda
		// notice that I do NOT have to specify the data type of a and b
		Calculate add = (a, b) -> a + b;
		Calculate difference = (a, b) -> Math.abs(a - b);
		Calculate divide = (a, b) -> (b != 0 ? a / b : 0);
		Calculate multiply = (a, b) -> a * b;

		System.out.println(add.calc(3, 2));
		System.out.println(difference.calc(5, 10));
		System.out.println(divide.calc(5, 0));
		System.out.println(multiply.calc(5, 3));
	}
}

@FunctionalInterface
interface Calculate {
	int calc(int x, int y);
}