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Java Arraylist add() Function
What is an ArrayList?
Arraylist is a part of collection framework in java. It contains some inbuilt function like add() function which can be found in the java.util.ArrayList Package.
It implements the List interface of the collections framework.
Here, in the page we will discuss about the ArrayList’s add() Method in java.
ArrayList add Function:
Arraylist contains several inbuilt functions that are used to perform several operations in of arraylist in Java. add() function is also an inbuilt method of class ArrayList.
add() method is used to add elements in an arraylist with the location.
Syntax:
arraylist_name.add(index,element)
Definition of Parameters:
- arrayList_name : This contains the name of the arraylist in which the functions have to be performed.
- index : it contains the index of the element at which it is inserted.
- element : It contains the element that has to be inserted.
Example Without the Specified Index:
// Importing all the required packages
import java.util.*;
public class Main{
public static void main(String[] args) {
// Initializing the arraylist
ArrayList PrepInsta = new ArrayList<>();
// Adding parameters to Arraylist
PrepInsta.add("Lakshit");
PrepInsta.add("Rishikesh");
PrepInsta.add("Rishik");
System.out.println("ArrayList: " + PrepInsta);
}
}
Output: ArrayList: [Lakshit, Rishikesh, Rishik]
Explanation:
In the above code we haven’t specified the index of the element to be added in the arraylist so by default, It will add the element at the end of the arraylist.
Inserting Element at a Specified Position:
We can also insert an element in the existing arraylist by specifying the location of the element in the add() function.
// Importing all the required packages
import java.util.*;
public class Main{
public static void main(String[] args) {
// Initializing the arraylist
ArrayList PrepInsta = new ArrayList<>();
// Adding elements to the arraylist
PrepInsta.add("Lakshit");
PrepInsta.add("Rishikesh");
PrepInsta.add("Rishik");
System.out.println("Before Adding an Element: " + PrepInsta);
// Adding element at the specified index
PrepInsta.add(1,"Nitin");
System.out.println("After adding an Element: " + PrepInsta);
}
}
Output: Before Adding the Element: [Lakshit, Rishikesh, Rishik] After adding the Element: [Lakshit, Nitin, Rishikesh, Rishik]
Explanation:
In the above Example. we add 3 elements to an arraylist without specifying the index and then we added an element with to the 1st index.
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