What is the "new anonymous class" said at 4min 27seconds of the video?

Question

Instructor said "Making a brand new anonymous class from this interface & overriding the 1 abstract method that needed be completed (the compare method)". What exactly is this anonymous class, and which line is it at? Thank you

Answer 1 · 2020-10-19T20:38:16Z

October 19, 2020 8:38pm

From the code in Main.java, the anonymous class is the one created with "new Comparator<Book>()". It's anonymous because you never store the class in a local property, it's just passed into the sort method. See example below that makes an non anonymous class The Comparator interface has an abstract method compare which this code is overriding.

// anonymous example
Collections.sort(books, new Comparator<Book>() {
            @Override
            public int compare(Book b1, Book b2) {
                return b1.getTitle().compareTo(b2.getTitle());
            }
        });

// not anonymous example
Comparator myComparator = new Comparator<Book>() {
            @Override
            public int compare(Book b1, Book b2) {
                return b1.getTitle().compareTo(b2.getTitle());
            }
        }

Java docs: https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html

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Ronnie N

Ronnie N

What is the "new anonymous class" said at 4min 27seconds of the video?

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Michael Kobela

Michael Kobela