Sorting using Comparator | Comparable Vs Comparator | Java interview question | Java collections

Published: 29 November 2019
on channel: Selenium Express

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In this video, we will go through the java comparator interface.

The difference between comparable and comparator in java is always a question to prepare for. It’s one of the very popular java interview questions.

Before you guys move on with this video make sure you have already gone through my java sorting series. Hit the below link to learn the java comparable and the comparator concept from the scratch.

   • How to sort in java? [ Comparable and Comp...

So we use a comparator for the customize sorting. Assume that you get a requirement to sort String class object in some order. You can’t change the String class source code. Hense to provide your own customize sorting logic you will be writing your comparator class by implementing an interface called comparator and overriding the compare() method. So the compare method is where we need to define our sorting logic. It’s similar to compareTo() of java Comparable interface.

You can use this video if you are preparing for a java interview and particularly if you are looking for some java collection interview question.

Ok, here is some final take away.

To sort a collection in a customized way, we need a Comparator interface.
Comparator interface is there inside java.util package.
we can use the Collection.sort(list, newComparartorObject) to sort our list.
The key method we discussed in this video compares() method of Comparator interface.

#ComparableVsComparator #JavaInterview #JavaCollections

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