import java.util.function.BiFunction;
class Calculator {
public String calc(BiFunction<Integer, Integer, String> bi, Integer i1, Integer i2) {
return bi.apply(i1, i2);
}
}
public class Main {
public static void main(String[] args) {
Calculator calculator = new Calculator();
String result = calculator.calc((a, b) -> "Result: " + (a * b), 3, 5);
System.out.println(result);
}
}