Use Comparable if you want to define a default (natural) ordering behaviour of the object in question, a common practice is to use a technical or natural (database?) identifier of the object for this.
Use Comparator if you want to define an external controllable ordering behaviour, this can override the default ordering behaviour.
See also:
- Sorting an ArrayList of objects using a custom sorting order
Quora
quora.com › What-is-a-difference-between-Comparator-and-Comparable-interface-in-Java-simple-words
What is a difference between Comparator and Comparable interface in Java simple words? - Quora
Answer: Comparator and Comparable are two different interfaces used to implement Sorting elements in an array. Difference: 1)Comparator is defined in java.util package, as it indicates that it can be used as utility. Whereas comparable is defined in java.lang package. 2)Comparator compare(obj1...
GeeksforGeeks
geeksforgeeks.org › java › comparable-vs-comparator-in-java
Java Comparable vs Comparator - GeeksforGeeks
August 18, 2025 - Functional Interface were introduced in Java 8. It has exactly one abstract method. In Comparator<T>, the only abstract method is: int compare(T o1, T o2);
java - When to use Comparable and Comparator - Stack Overflow
Interviewer asked, why use Comparator when the same can be done with Comparable, and I was dumb :( 2016-06-10T10:31:24.66Z+00:00 ... when you want comparing behaviour different from the default (which is specified by Comparable) behaviour. ... A comparable object is capable of comparing itself with another object. The class itself must implements the java... More on stackoverflow.com
Comparator vs Comparable
Yeah, I think you understand it. If you're writing a class whose instances have some intrinsic/obvious way of being compared, then you might want to have that class implement Comparable. If you need to sort a list/array of objects that are not Comparable, or if you want to sort them in some custom manner, then you would want to use a Comparator object to specify how the objects should be compared. More on reddit.com
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March 22, 2017Trouble understanding the Comparator Interface and the compare method and compareTo method.
Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today. Start your free trial ... I am working on the java data structures Karaoke project. I am having trouble understanding the difference between the comparable interface and ... More on teamtreehouse.com
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Comparator vs Comparable
I mean they're different things so you can't just always use one or the other. A comparator is a bit of code that knows how to sort a type of object, making an object comparable is teaching the object how to sort sort its own type. If I'm making an object for use elsewhere in an application or for an external library it's way more convenient for everyone who works with it if the object knows how to sort itself reasonably. Creating a comparator that they also need to know about and pass into every attempt to sort your object is clumsy and fragile. Similarly if you're working with an object who you can't change the implementation of, a comparator allows you to sort those objects, or for times when the default comparable behavior won't work correctly you can use the custom comparator. They're different tools for different situations but most of the time when something needs sorted making the item comparable is the right first step. More on reddit.com
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April 26, 2021What is the most crucial difference between Comparable and Comparator in Java?
Comparable defines a single natural object sorting order by implementing compareTo() within the class. The Comparator allows for multiple sorting orders, implemented externally via the compare() method.
theknowledgeacademy.com
theknowledgeacademy.com › blog › comparable-vs-comparator
Comparable vs. Comparator: Key Differences and When to Use
What are the advantages of Comparable over Comparator?
Advantages of Comparable include simpler implementation, automatic use in sorted collections, and defining a class's natural ordering. It's more intuitive when a class has an obvious default sort order. Comparable also requires less code than creating separate Comparator classes.
upgrad.com
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Comparable vs Comparator in Java Guide
What happens if I don't implement Comparable or Comparator for sorting?
If you attempt to sort objects that don't implement Comparable and don't provide a Comparator, Java throws a ClassCastException. Primitive types and String already implement Comparable, but custom classes need explicit implementation for sorting to work.
upgrad.com
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Comparable vs Comparator in Java Guide
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What is the difference between Comparator and Comparable? - Cracking ...
Interview Question | Comparable vs Comparator Detailed ...
Upgrad
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Comparable vs Comparator in Java Guide
May 19, 2025 - The Comparator interface provides a way to define custom sorting criteria. Unlike Comparable, Comparator is external to the class being compared. This separation offers greater flexibility.
Quora
quora.com › What-is-the-difference-between-comparator-and-comparable-in-Java
What is the difference between comparator and comparable in Java? - Quora
Answer (1 of 6): Besides the fact that they're two different types of objects used in different situations. I'm not that up to date on comparators but basically whenever I've used them, they were interfaces that I created anonymous implementations thereof and passed them into a method as an argu...
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Use Comparable if you want to define a default (natural) ordering behaviour of the object in question, a common practice is to use a technical or natural (database?) identifier of the object for this.
Use Comparator if you want to define an external controllable ordering behaviour, this can override the default ordering behaviour.
See also:
- Sorting an ArrayList of objects using a custom sorting order
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I would say that an object should implement Comparable if that is the clear natural way to sort the class, and anyone would need to sort the class would generally want to do it that way.
If, however, the sorting was an unusual use of the class, or the sorting only makes sense for a specific use case, then a Comparator is a better option.
Put another way, given the class name, is it clear how a comparable would sort, or do you have to resort to reading the javadoc? If it is the latter, odds are every future sorting use case would require a comparator, at which point the implementation of comparable may slow down users of the class, not speed them up.
Tech With KP
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Comparable vs Comparator in Java (Differences, Examples & Its Uses) - Tech With KP
January 9, 2026 - If you try to sort a list of Person objects using Collections.sort(), Java throws a compile-time error because it does not know how to compare two Person objects. ... The Comparable interface defines a natural ordering for objects of a class.
The Knowledge Academy
theknowledgeacademy.com › blog › comparable-vs-comparator
Comparable vs. Comparator: Key Differences and When to Use
3 weeks ago - In Java, both the Comparable and Comparator interfaces are used to compare objects for sorting, but they operate differently. Comparable provides a natural ordering for objects by implementing the compareTo() method within the class itself.
Medium
medium.com › @salvipriya97 › comparator-vs-comparable-33ef1e39161b
Comparator vs Comparable. In Java, Comparator and Comparable are… | by Priya Salvi | Medium
September 6, 2023 - In this case, it makes sense to use Comparable because the natural ordering of books can be based on their publication years, and you can modify the book class to implement Comparable. We will use a Comparator to specify a custom sorting criterion (sorting by title) while still preserving the natural ordering of Book objects based on the publication year · import java.util.*; public class BookComparatorByTitle implements Comparator<Book> { @Override public int compare(Book book1, Book book2) { return book1.getTitle().compareTo(book2.getTitle()); } }
Medium
ashutoshkrris.medium.com › comparable-vs-comparator-explained-in-java-0aabaedf8d47
Comparable vs Comparator Explained in Java | by Ashutosh Krishna | Medium
July 21, 2024 - The Comparator interface in Java ... objects. Unlike the Comparable interface, which allows only a single natural ordering, Comparator is designed to offer flexibility by allowing multiple sorting strategies....
Benchresources
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Java - Comparable v/s Comparator - BenchResources.Net
June 21, 2022 - In this article, we will compare 2 important interface in collection framework i.e.; Comparable v/s Comparator Comparable interface Comparator interface Both interface is used to sort Read More
Reddit
reddit.com › r/learnprogramming › comparator vs comparable
r/learnprogramming on Reddit: Comparator vs Comparable
March 22, 2017 -
Hi Everyone :) can someone please explain to me what is the difference between Comparator and Comparable ? I mean when should i use one or another? Can i think of it this way : the Comparable's compareTo() defines the standard way of sorting a list (using the 1 arg sort() in Collections) and if i want to compare objects in many different ways i add Comparators to the class and i call the 2 args sort() ? Thanks in advance Melodie
Top answer 1 of 3
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Yeah, I think you understand it. If you're writing a class whose instances have some intrinsic/obvious way of being compared, then you might want to have that class implement Comparable. If you need to sort a list/array of objects that are not Comparable, or if you want to sort them in some custom manner, then you would want to use a Comparator object to specify how the objects should be compared.
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Comparable provides a standard way to sort objects, whereas Comparator is used to sort objects against the normal sorting defined in the compareTo method on that object type.
Team Treehouse
teamtreehouse.com › community › trouble-understanding-the-comparator-interface-and-the-compare-method-and-compareto-method
Trouble understanding the Comparator Interface and the compare method and compareTo method. (Example) | Treehouse Community
August 19, 2016 - Also, the difference between compare and compareTo methods. And why we pass in a Comparator as an argument when calling a sort method.
TutorialsPoint
tutorialspoint.com › difference-between-comparable-and-comparator-in-java
Difference between Comparable and Comparator in Java
April 15, 2025 - Comparable and Comparator both are an interface that can be used to sort the elements of the collection. Comparator interface belongs to java.util package while comparable belongs to java.lang package. Comparator interface sort collection using two o
DiffNow
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W3Schools
w3schools.com › js › js_comparisons.asp
W3Schools.com
You will learn more about the use ... in the if...else chapter of this tutorial. All the comparison operators above can also be used on strings: let text1 = "A"; let text2 = "B"; let result = text1 < text2; Try it Yourself » ... Comparing data of different types may give unexpected results. When comparing a string with a number, JavaScript will convert ...
DEV Community
dev.to › hamzajvm › core-java-comparator-vs-comparable-57el
Core Java: Comparator vs. Comparable - DEV Community
September 12, 2020 - When using a Comparable interface we don’t need to make any code changes at the client-side. For example, Collections#sort method automatically uses the compareTo() method of the class. For Comparator, the client needs to provide the Comparator class to use in compare() method. Both of these interfaces are part of the Java Collection framework.
W3Schools
w3schools.com › java › java_advanced_sorting.asp
Java Advanced Sorting (Comparator and Comparable)
It is easier to use the Comparable interface when possible, but the Comparator interface is more powerful because it allows you to sort any kind of object even if you cannot change its code.
Coderanch
coderanch.com › t › 677942 › java › Comparator-Comparable
Comparator or Comparable (Java API forum at Coderanch)
March 31, 2017 - Note that both Comparable and Comparator are parametrised interfaces, so should be implemented thus:-Comparable is a “mixin interface”, so its functionality should normally be added to an existing class. Comparator is not a mixin, so classes implementing Comparator should do the ...
Minecraft Wiki
minecraft.wiki › w › Redstone_Comparator
Redstone Comparator – Minecraft Wiki
January 2, 2026 - When a comparator measures a large chest or large trapped chest, it measures the entire large chest (54 slots), not just the half directly behind the comparator. in Java Edition, a chest or trapped chest that cannot be opened (either because it has a conductive block or a sitting cat above it) always produces an output of 0 no matter how many items are in the container — shulker boxes can always be measured, even if they cannot open.
Guru99
guru99.com › home › java tutorials › comparable vs comparator in java
Comparable vs Comparator in Java
November 26, 2024 - Comparable in Java is an object to compare itself with another object, whereas Comparator is an object for comparing different objects of different classes.