Introduction to Programming

Method references

Let's look at our last implementation of the call to the supplyDecidePprocessAndConsume() method:

supplyDecideProcessAndConsume(() -> 7, d -> d < 5, i -> i * 5.,                     d -> System.out.println("Result=" + d + " Great!")); 

The functions we have used are pretty trivial. In real-life code, each of them may require a multiple-line implementation. In such a case, to put a code block inline would make the code almost unreadable. In such cases, referring to the methods with the necessary implementation helps. Let's assume we have the following Helper class:

public class Helper {  public double calculateResult(int i){    // Maybe many lines of code here    return i* 5;  }  public static void printResult(double d){    // Maybe many lines of code ...