[FIXED] How do I compare values of an Object with the StreamAPI and Lambda expressions?

Issue

I got a problem with streams. I'm trying to compare everything in my LinkedList to get the latest Medium with the StreamAPI. The problem I run into is that my methode sucheNeuesMedium() throws NoSuchElementExeption, because get() finds no value. The stream is filled with elements (befor anyone says "be sure that you got objects in your list"). I want to compare them by the value of "Jahr" (it has to be with the StreamAPI and Lambda expressions). Any ideas how I can make this run? If you need further information I will supply you.

    //In class Medienverwaltung
    LinkedList<Medium> liste = new LinkedList<Medium>();
    Iterator<Medium> it = liste.iterator(); //irrelevant for this task
    Stream<Medium> stream = liste.stream();

    public Medium sucheNeuesMedium() {
        return stream.max(Comparator.comparing(Medium::getJahr)).get();
    }

    //In abstract class Medium
    public int getJahr() {
        return jahr;
    }

Solution

I found my error: I have to operate with liste.stream() and then my comparison. I always tried it on Imported objects (serialized), meaning the stream stayed empty (the stream got initialized with the empty list). But if I use liste.stream().max(Comparator.comparing(Medium::getJahr)).get(); it works flawless and multiple times not once. I didn't think about the stream being used aswell. It works, but still thanks for the fast answers.

Answered By - Hristian

Answer Checked By - Senaida (PHPFixing Volunteer)