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Course Introduction Introduction to Collections

Lists in Java

ArrayList: Introduction

ArrayList: Inserting and Retrieving Elements

ArrayList: Operations

ArrayList: Iteration

ArrayList: Iteration using ListIterator

ArrayList Sorting

Understanding Comparable Interface

Understanding Comparator Interface

ArrayList: Exercise

ArrayList: Exercise Solution

Quiz: ArrayList

LinkedList in Java

LinkedList: Introduction LinkedList: Fetching and Removing

CopyOnWriteArrayList in Java

CopyOnWriteArrayList: Introduction CopyOnWriteArrayList: Internal Working CopyOnWriteArrayList: Iteration

Sets in Java

HashSet: Creation and Insertion HashSet: Operations HashSet: Iteration and Sorting HashSet: Exercise HashSet: Exercise Solution HashSet: Quiz

TreeSet in Java

TreeSet: Creation and Insertion TreeSet: Fetching and Removal TreeSet: Exercise TreeSet Exercise Solution

HashMap In Java

HashMap: Creation and Insertion HashMap: Updation and Removal HashMap: Operations HashMap: Java 8 Improvements HashMap: Internal Implementation HashMap: How to Design a Good Key HashMap: Iteration HashMap: Exercise HashMap: Exercise Solution HashMap: Quiz

TreeMap in Java

TreeMap: Creation and Insertion TreeMap: Fetching and Removal TreeMap: Sorting a TreeMap by Values TreeMap: HashMap Sorting

LinkedHashMap in Java

LinkedHashMap: Introduction LinkedHashMap: Internal Working

Additional Map Implementations

ConcurrentHashMap IdentityHashMap EnumMap

Arrays Class

Searching an Array Sorting an Array Copying an Array Arrays: Operations Quiz: Arrays

Collections Class

Finding the Min and Max element Searching, Filing, and Copying Collection Making Collections Unmodifiable Making Collections thread-safe Thank You!

Collections in Java/

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Understanding Comparator Interface

Understanding Comparator Interface

Let's discuss the working of Comparator Interface.

We'll cover the following...

One of the major drawbacks of using a Comparable interface is that the comparing logic gets fixed. For instance, if we have a Vehicle class, then it can be sorted either on the basis of the brand or the production year depending on the implementation of the compareTo() method.

If we need some flexibility in sorting, we should use the Comparator interface instead of the Comparable interface. The Comparator interface has a method, compare(T o1, T o2) ...