Learn about collections in Java such as LinkedLists, HashSet, HashMap and more.

Java for Programmers

Collections 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.

Java Collections

## 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**.
 
 

# 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.

Introduction

ArrayList

LinkedList

CopyOnWriteArrayList

HashSet

TreeSet

HashMap

TreeMap

LinkedHashMap

Additional Map Implmentations

Arrays

Collections class

HashSet: Additional Operations

Removing an element from a HashSet

Using the `remove(Object o)` method