JAVA ARRAYLIST CLASS – PART 2 PART 3 SORT
CLICK JAVA ARRAYLIST CLASS – PART 2 PART 3 SORT
JAVA PROGRAMMING
ARRAYLIST CLASS
PART 2 PART 3
SORT
Please watch PART 1 of ArrayList.
HOW to use ArrayList with INTEGER, BOOLEAN, CHARACTER ?
How to Sort using Collections Class ?
When to use Collections METHODS ?
Examples of Java programs.
The ArrayList
class in Java is a part of the Java Collections Framework and has several interesting and useful features:
- Dynamic Array Implementation:
ArrayList
in Java is essentially a dynamic array for storing elements. Unlike regular arrays, which have a fixed size,ArrayLists
can dynamically resize themselves when elements are added or removed. - Implements the List Interface:
ArrayList
implements theList
interface, which means it provides methods to manipulate the size of the array that is used internally to store the list. - Object Storage:
ArrayList
can store any type of objects, and since Java 5, it supports Generics, which makes it possible to create anArrayList
of a specific type, such asInteger
,String
, etc. - Automatic Resizing: When adding elements to an
ArrayList
, it automatically resizes itself to accommodate additional elements. This resizing operation does not need to be handled by the programmer. - Random Access: The
ArrayList
class provides random access to its elements because it uses an array internally. This means you can access any element in constant time using its index. - Not Synchronized:
ArrayList
is not synchronized, meaning it is not thread-safe by default. If multiple threads access anArrayList
instance concurrently and at least one of the threads modifies it, it must be synchronized externally. - Supports Iteration:
ArrayList
supports iterators, which can be used to traverse the list in either direction (forward and backward). - Manipulation Methods: It provides various methods to manipulate the data, including
add()
,remove()
,clear()
,indexOf()
, andsize()
, among others. - Performance Aspects: While
ArrayList
offers constant time complexity for basic operations likeget()
andset()
, adding elements to anArrayList
can be slower than a standard array due to the resizing and potential data copying. - Serialization and Cloning:
ArrayList
implements the Serializable interface, so it can be used in serialization and deserialization processes. It also supports cloning to create a shallow copy of the list.
Overall, the ArrayList
class in Java provides a flexible and powerful way to store and manipulate lists of objects, with many features that make it a popular choice for Java developers.