What is ArrayList in Java

What is arraylist – What is ArrayList in Java?

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What is arraylist: In the previous article, we have seen Java Program to Synchronize an ArrayList

In this article we will know what is ArrayList in Java.

What is ArrayList in Java? 

ArrayList:

ArrayList in Java is like an array with no size limit means type of resizable array. It is a part of collection framework and it is present in java.util package. ArrayList class in Java implements List interface which extends Collection interface.

ArrayList (class) —extends—> AbstractList (class) —implements—> List (interface) —extends—> Collection (interface) —extends—> Iterable (interface)

Creating an ArrayList:

ArrayList<Type> SampleArrayList= new ArrayList<>();

Where,

  • Type represents the type of arraylist.
  • SampleArrayList is name of the arraylist.

Example:

ArrayList<Integer> arrayList = new ArrayList<>(); //ArrayList of Integer type

ArrayList<String> arrayList = new ArrayList<>();  //ArrayList of String type

Let’s see an program to understand it more clearly.

Program:

import java.util.ArrayList;

class Main 
{
  public static void main(String[] args)
  {

    //ArrayList created
    ArrayList<String> city = new ArrayList<>();

    // Adding elements to the ArrayList
    city.add("Chennai");
    city.add("Kolkata");
    city.add("Bhubaneswar");
    city.add("Hyderabad");
    city.add("Banglore");
    city.add("Pune");
    city.add("Gurgaon");
    city.add("Bhopal");
    System.out.println("ArrayList: " + city);
  }
}
Output:

ArrayList: [Chennai, Kolkata, Bhubaneswar, Hyderabad, Banglore, Pune, Gurgaon, Bhopal]

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