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Java Stream - 如何與Lambda通過BiFunction

我們想知道如何與Lambda通過BiFunction。 
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);
  }
}