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package com.mycompany.ja13;

public class Main {

    public static void main(String[] args) {
        Calculator с = null;

        Calculator c2 = new CalculatorImpl();
        c2.calc(10, 20);
        // нет необходимости создавать отдельный класс
        Calculator c3 = (a, b) -> {return a + b;};
        int res = c3.calc(20, 20);
        System.out.println("res=" + res);

        Runnable r = () -> {System.out.println("HELLO");};
        r.run();
    }

}