Web Reference: Feb 2, 2026 · The Comparator interface in Java is used to define custom sorting logic for objects. It belongs to java.util package allows sorting of objects of user-defined classes without modifying their source code. Unlike Comparable, a comparator may optionally permit comparison of null arguments, while maintaining the requirements for an equivalence relation. This interface is a member of the Java Collections Framework. Mar 26, 2025 · In this article, we explored the Comparable and Comparator interfaces, and discussed the differences between them. To understand more advanced topics of sorting, check out our other articles, such as Java 8 Comparator, and Java 8 Comparison with Lambdas.
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