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Arraylist Methods In Java

Last Updated : Mar 11, 2024

Arraylist Methods In Java

In this article we will show you the solution of arraylist methods in java, conventional arrays have a defined length, so we must predefine their size in advance.

Nevertheless, there are times when we are unable to predict the size of an array, necessitating the development of a system whose size can initially be initialised but later alter dynamicallyAn ArrayList class was developed to address each of these requirements.

The List Interface is defined by ArrayList since it's a subclass of AbstractList.

Its parent class defined and passed on a number of its methods to this one. Now move to the concept of arraylist methods in java.

Step By Step Guide On Arraylist Methods In Java :-

The Java ArrayList class also has a complete function API that contains of methods for manipulating ArrayList instances.

The ArrayList elements can be added, deleted, searched, and the length and size of the ArrayList elements can be obtained using these methods, among other things.

arraylist add moves this element at that location and any following items to the right in order to add the given element "element" at the designated position "index".

Due to its void return type, it has no output. If the supplied index is outside of the acceptable range, an IndexOutOfBoundsException is thrown.

import java.util.ArrayList;
 public class Main {
    public static void main(String[] args) {
        ArrayList<Integer> noList = new ArrayList<Integer>();
        System.out.println("Initial ArrayList:");
        noList.add(0, 3);
        noList.add(0, 1);
        System.out.println("ArrayList after adding elements at the beginning:");
  1. Using import java.util.Arraylist the package is imported in the first line of code. It's the java.util package contains the ArrayList class, a resizable array.
  2. An array's size cannot be changed, which is how built-in arrays differ from ArrayLists in Java.
  3. After that, we begin with the main function, which is denoted by keyword public static void main. This is how you add a main method to a Java application.
  4. Then, we utilise public static void main (String[] args) This main() technique is a unique Java programming method that acts as a Java program's publicly accessible entry point.
  5. After that, the new arraylist is defined and given an integer initialization.
  6. We then use the system.out.println function to print the arraylist along with some text.
  7. After that, in order to add entries to the list's beginning, we utilise the add method with index.
  8. Using the Add method and the index indicated in the method's parameter, one element of a specific object type is added to the arraylist at that location.
  9. Using system.out.println, we then print this statement ArrayList after adding elements to the beginning of the arraylist. Using the nolist that we constructed, we then output the arraylist.

Conclusion :-

As a result, we have successfully mastered the Java idea of arraylist methods.

We also learned that ArrayList supports the List Interface and serves as a subclass of AbstractList.

This class received several of its methods from its parent class, which also defined them.

These methods include getting the length & size of a ArrayList elements, as well as the ability to add, delete, and search the ArrayList elements.

I hope this article on arraylist methods in java helps you and the steps and method mentioned above are easy to follow and implement.

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Passionate Electronics and Communication Engineering student with expertise in web development (HTML, CSS, JS,PHP, Bootstrap, React.js) and content writing. Eager problem solver and tech enthusiast, adept at creating engaging web experiences.

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