Question about the process() in Lession 1-2 method

Lesson 1-2 contains the statement "String r = process (list, (x, y)-> x.length () - y.length ())", that I do not understand and cannot parse, even if I am a little familiar with lambda expressions. "  The method takes a list of String and a comparator, but the result is assigned to a unique string.  What result returned by this method?

Looks like you are looking to slide 4 lesson 1-2.

The example here does not say what the process() method, but one can imagine that she's going through all the items in the list and chooses the one that is the largest according to the provided comparer. This is similar to the Collections.max (Collection, comparator) method. Who is?

Furthermore, there is a small error in the declaration of the process() method which could give a little trouble. The statement must have a parameter of type:

static T process(List l, Comparator c)

If you have problems, the analysis of the code, the line in the example is

String r = process(list, (x, y) -> x.length() - y.length())

In this case, the reference parameter is the lambda expression

(x, y) -> x.length() - y.length()

This has two parameters which, in this context, must be of type String. The Agency calculates the difference between the lengths, which is an int. Thus, the lambda takes two strings and returns an int. This corresponds to the comparator interface compare() method.

Tags: Java

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