Gain insights into Java Collections Framework. Delve into lists, sets, and hashmaps. Learn about data modification, sorting, thread-safety, and internal workings for efficient usage.

Collection is one of the most important topics for Java programming. Without the proper knowledge of every collection type in Java, it becomes difficult for you to decide which option to pick in a particular scenario.

This course will give you a great understanding of all collection types available in the Collections Framework like lists, linked lists, sets, and hashmaps. 

After completing this course, you will know how data can be modified within a collection, how to sort a collection, and how it can be made thread-safe. You will also cover the internal working of each Java collection so you can work with them more efficiently.

Collections in Java

# Removing an element from a HashSet
Below are the ways that we can remove an element from the **HashSet**.

## Using the `remove(Object o)` method

We can use the `remove(Object o)` method to remove an element from **HashSet**. This method takes an object that needs to be removed as a parameter. If the element is removed, then this method returns `true`. If the element is not present, then it returns `false`.

## Using the `clear()` method
We can use the `clear()` method to remove all the elements from a **HashSet**.
 
 

Let's discuss some operations that can be done on HashSet.

Let's Begin

Lists in Java

LinkedList in Java

CopyOnWriteArrayList in Java

Sets in Java

TreeSet in Java

HashMap In Java

TreeMap in Java

LinkedHashMap in Java

Additional Map Implementations

Arrays Class

Collections Class

HashSet: Operations

Removing an element from a HashSet