#92 ArrayList in Java

Check out our courses:

Mastering Agentic AI with Java : https://go.telusko.com/agentic-ai
Coupon: TELUSKO10 (10% Discount)

DevOps Bootcamp: https://go.telusko.com/complete-devops
Coupon: TELUSKO10 (10% Discount)

Master Java Spring Development : https://go.telusko.com/learn-master
Coupon: TELUSKO10 (10% Discount)

For More Queries WhatsApp or Call on : +919008963671

website : https://telusko.com/

Udemy Courses:

Java Spring:- https://go.telusko.com/Udemyjavaspring
Java:- https://go.telusko.com/udemyteluskojava
Spring: https://go.telusko.com/udemyteluskospring
Java For Programmers:- https://go.telusko.com/javaProgrammers
Python : https://go.telusko.com/udemyteluskopython
Git : https://go.telusko.com/udemyteluskogit
Docker : https://go.telusko.com/udemyteluskodocker

Instagram : https://www.instagram.com/navinreddyofficial/
Linkedin : https://in.linkedin.com/in/navinreddy20
WhatsApp : https://go.telusko.com/whatsapp
TELUSKO Android App : https://go.telusko.com/TELUSKOAPP
TELUSKO IOS App : https://apple.co/3SsgmU2
Discord : https://discord.gg/D8hWe9BqfF

In this lecture we will learn:
– Collection in Java
– Use of collection interface and classes
– What is the use of Generics?
– ArrayList and its properties
– How ArrayList is different from Arrays?
– Advantages of Collection framework

#1
The collection interface belongs to java.util.Collection package. All classes and methods of collection interface belong to this java.util package.
– API means a library or some features that we can use directly, we do not need to define an implementation for it.
– Collections List, Queue, Map and Set simply extend the Collection interface and this collection interface must have its own class implementation.
– we can also convert a collection into an array.
– ArrayList is used like:
Collection nums=new ArrayList();
nums.add(6);
– We can add values in a collection by using the add() method.
— We do not have indexing for the collection API.
– In the array, we need to specify its type of it. While Collection API works with objects.
– All the data types classes like integer and float extend an object class and thus collection API directly use an object.

#2
– To define the data types in collection API, we use Generics.
– You can define the type of an object to which data type class it belongs in angular brackets like:
Collection(Integer) nums= new ArrayList Integer ();
– Here, we use Integer as it is a class, while int is a primitive data type.
– If we do not specify the datatype of a collection object, then it will give a run-time error.

#3
– ArrayList is a class that implements a list. The list does not have a method called get because it list works with an index in the values.
– It uses a dynamic array to store the duplicate element of different data types.
– The ArrayList class maintains the insertion order and is non-synchronized.
– The elements stored in the ArrayList class can be randomly accessed.
– The size of an ArrayList is increased automatically if the collection grows or shrinks if the objects are removed from the collection.
– If you want to use and fetch values from an ArrayList, then you can use Collection.
Collection Integer nums= new ArrayList Integer ();
– If you want to work with an index value, you should use List as it supports index values.
List Integer nums= new ArrayList Integer ();

#4 Advantages of Collection Framework:
– Consistent API
– Reduces programming efforts
– Increases program speed and quality

Github repo : https://github.com/navinreddy20/Javacode.git

More Learning :

Java :- https://bit.ly/3x6rr0N
Python :- https://bit.ly/3GRc7JX
Django :- https://bit.ly/3MmoJK6

JavaScript :- https://bit.ly/3tiAlHo
Node JS :- https://bit.ly/3GT4liq

Rest Api :-https://bit.ly/3MjhZwt
Servlet :- https://bit.ly/3Q7eA7k
Spring Framework :- https://bit.ly/3xi7buh
Design Patterns in Java :- https://bit.ly/3MocXiq
Docker :- https://bit.ly/3xjWzLA

Blockchain Tutorial :- https://bit.ly/3NSbOkc
Corda Tutorial:- https://bit.ly/3thbUKa
Hyperledger Fabric :- https://bit.ly/38RZCRB

NoSQL Tutorial :- https://bit.ly/3aJpRuc
Mysql Tutorial :- https://bit.ly/3thpr4L

Data Structures using Java :- https://bit.ly/3MuJa7S
Git Tutorial :- https://bit.ly/3NXyCPu

Donation:
PayPal Id : navinreddy20
https://www.telusko.com