@FunctionalInterface
interface MathOperation
{
    int operation(int a, int b);
}

public class LambdaDemo
{

    public static void main(String[] args)
    {

        LambdaDemo lambdaDemo = new LambdaDemo();

        // with type declaration
        MathOperation addition = (int a, int b) -> a + b;

        // with out type declaration
        MathOperation subtraction = (a, b) -> a - b;

        // with return statement along with curly braces
        MathOperation multiplication = (int a, int b) -> {
            return a * b;
        };

        // without return statement and without curly braces
        MathOperation division = (int a, int b) -> a / b;

        System.out.println("10 + 5 = " + lambdaDemo.operate(10, 5, addition));

        System.out.println("10 - 5 = " + lambdaDemo.operate(10, 5, subtraction));
        
        System.out.println("10 x 5 = " + lambdaDemo.operate(10, 5, multiplication));
        
        System.out.println("10 / 5 = " + lambdaDemo.operate(10, 5, division));
    }

    private int operate(int a, int b, MathOperation mathOperation)
    {
        return mathOperation.operation(a, b);
    }

}

10 + 5 = 15
10 - 5 = 5
10 x 5 = 50
10 / 5 = 2