10) Comparator vs Comparable in Java | Sort List, Custom Logic & Lambda Explained
Learn how sorting works in Java — from simple lists to advanced custom sorting logic using Comparator and Comparable.
This tutorial covers everything you need to know about sorting collections in Java, including Collections.sort(), custom comparators, and lambda expressions for clean and modern code.
🚀 In this Java Sorting Tutorial, you’ll learn:
How to use Collections.sort() to sort a List in Java
The internal logic behind sorting (compare and swap explained)
How to create your own Comparator for custom sorting
Sorting numbers by last digit or custom rule
Sorting custom objects (like Student class) by age, name, or any field
Difference between Comparator vs Comparable
How Comparable lets objects compare themselves
How to simplify sorting using Lambda Expressions
Interview tips on Comparator & Comparable (commonly asked in Java interviews)
💡 Real-World Example:
We’ll sort a list of students based on their age using both Comparable and Comparator, then rewrite it using a single-line Lambda!
🧠 You’ll Understand:
✔ When to use Comparator
✔ When to use Comparable
✔ How to sort Lists, Custom Classes, and Strings by Length
✔ How to write concise, readable sorting code in Java 8+
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