What is a collection in Java?

A collection is a container that holds a group of objects. The collection provides a way to manage objects easily. Collections manage groups of objects as a single unit.

Read also: What is Vector Java?

Common Collection Types

1. List:
   • ArrayList: Best for general-purpose storage and fast random access.
   • LinkedList: Good for frequent insertions and deletions.
2. Set:
   • HashSet: Use when you need a set with no duplicates and order doesn’t matter.
   • LinkedHashSet: Maintains insertion order.
   • TreeSet: Keeps elements sorted.
3. Map:
   • HashMap: Best for general-purpose key-value storage.
   • LinkedHashMap: Maintains insertion order.
   • TreeMap: Stores keys in sorted order.

Here are a few basic operations we do on collections :
1) Adding objects to the collection.
2) Removing or deleting objects from the collection.
3) Retrieving objects from the collection.
4) Iterating collection