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In Java, the Comparator interface is used to define custom sorting logic for objects in a list. It allows you to sort objects based on specific attributes without modifying their class.
Example: Sorting by Custom Attribute
Below is an example of sorting a list of objects using a Comparator.
import java.util.*;class Product {int id;String name;double price;Product(int id, String name, double price) {this.id = id;this.name = name;this.price = price;}@Overridepublic String toString() {return id + " " + name + " $" + price;}}class PriceComparator implements Comparator<Product> {@Overridepublic int compare(Product p1, Product p2) {return Double.compare(p1.price, p2.price); // Ascending order by price}}public class Main {public static void main(String[] args) {List<Product> products = new ArrayList<>();products.add(new Product(1, "Laptop", 800.00));products.add(new Product(2, "Phone", 500.00));products.add(new Product(3, "Tablet", 300.00));System.out.println("Before Sorting:");products.forEach(System.out::println);Collections.sort(products, new PriceComparator());System.out.println("\nAfter Sorting by Price:");products.forEach(System.out::println);}}Copied!✕Copy Sort an Array in Java using Comparator - GeeksforGeeks
Jul 23, 2025 · A Comparator is an object that can be used to compare two objects and determine their order. We can use a Comparator to sort a list of objects in any order we can choose, not just in …
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A Comparator is an object that can be …
How to Sort ArrayList using …
Using Comparator we can sort ArrayList …
Java Advanced Sorting (Comparator and Comparable)
The Comparator and Comparable interfaces allow you to specify what rule is used to sort objects. Being able to specify a sorting rule also allows you to change how strings and numbers are sorted.
Mastering Java Sorting with Comparators — javaspring.net
Nov 12, 2025 · The Comparator interface in Java is a powerful tool for customizing the sorting behavior of objects. It allows you to define complex sorting criteria, sort in reverse order, and sort by multiple …
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The tutorial demonstrates how to write custom comparison logic, chain multiple comparators, and apply sorting techniques across various data structures, ultimately enhancing code flexibility and …
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Nov 12, 2025 · In this blog, we will explore the fundamental concepts of using a `Comparator` to sort arrays in Java, along with usage methods, common practices, and best practices.
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Nov 11, 2025 · This post will discuss how to sort a list of objects using Comparator in Java. A Comparator is a comparison function, which provides an ordering for collections of objects that don’t …
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