ArrayList Class In Java

First implementation class of List interface is ArrayList.It is very easy to and useful. ArrayList provides index basis operation. Java ArrayList Class uses a dynamic array to store the elements. Java ArrayList Class acquires AbstractList class and implements List interface.

The important points about Java ArrayList class are:

1. Java ArrayList class can contain/store duplicate elements. In ArrayList store duplicate value.
2. Java ArrayList class maintains insertion order, means which order you store the value return is also same.
3. Java ArrayList class is none synchronized. Multiple threads not working in same time.
4. Java ArrayList allows random access. You can iterate the ArrayList elements index basis because array works at the index basis.ArrayList internally use the dynamic array.
5. In Java ArrayList class, manipulation is slow because a lot of shifting needs to occur if any element is removed from the array list.

Methods of Java ArrayList

Example :-

package CollectionOperaton;

import java.util.ArrayList;
import java.util.List;

public class ArrayListOperation {
    public static void main(String args[]){
        //First create a ArrayList String type
        List<String> arraylist = new ArrayList<String>();
        //Add the elements in arrayList
        arraylist.add("Tom");
        arraylist.add("Jeery");
        arraylist.add("Ducktales");
        
        for(String str:arraylist){
            System.out.println(str);
        }              
        }

}