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 the List 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 an ArrayList of a specific type, such as Integer, 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 an ArrayList 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(), and size(), among others.
  • Performance Aspects: While ArrayList offers constant time complexity for basic operations like get() and set(), adding elements to an ArrayList 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.