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Program: Basic ArrayList Operations.


Here we can see example for basic ArrayList operations like creating object for ArrayList, adding objects into ArrayList, accessing objects based on index, searching an object in ArrayList whether it is listed under this instance or not, adding elements at specific index, checking whether the ArrayList is empty or not, getting object index, and finally size of the ArrayList.

package com.java2novice.arraylist;

import java.util.ArrayList;

public class MyBasicArrayList {

        public static void main(String[] a){
                ArrayList<String> al = new ArrayList<String>();
                //add elements to the ArrayList
                //get elements by index
                System.out.println("Element at index 1: "+al.get(1));
                System.out.println("Does list contains JAVA? "+al.contains("JAVA"));
                //add elements at a specific index
                System.out.println("Is arraylist empty? "+al.isEmpty());
                System.out.println("Index of PERL is "+al.indexOf("PERL"));
                System.out.println("Size of the arraylist is: "+al.size());

Element at index 1: C++
Does list contains JAVA? true
Is arraylist empty? false
Index of PERL is 3
Size of the arraylist is: 5
Next Program >>

List Of All ArrayList Sample Programs:

  1. Basic ArrayList Operations.
  2. How to read all elements in ArrayList by using iterator?
  3. How to copy or clone a ArrayList?
  4. How to add all elements of a list to ArrayList?
  5. How to delete all elements from my ArrayList?
  6. How to find does ArrayList contains all list elements or not?
  7. How to copy ArrayList to array?
  8. How to get sub list from ArrayList?
  9. How to sort ArrayList using Comparator?
  10. How to reverse ArrayList content?
  11. How to shuffle elements in ArrayList?
  12. How to swap two elements in a ArrayList?
  13. How to convert list to csv string format?
Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{


Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
Famous Quotations
The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge.
-- Daniel J. Boorstin

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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