AbstractList add(int index, E element) method in Java with Examples

The add(int index, E element) method of AbstractList is used to insert an element at the specified position in this list. The new element is inserted at the specified index in this list.

Syntax:

public void add(int index, E element)

Parameters: This method takes 2 parameters :-

index: index at which the specified element is to be inserted
element: element to be inserted

Returns: The function returns a boolean value True if the element is successfully inserted in the List otherwise it returns False.

Exceptions:The exceptions present are :-

ClassCastException: if the class of an element of this set is incompatible with the specified collection
NullPointerException: if this set contains a null element and the specified collection does not permit null elements, or if the specified collection is null.
UnsupportedOperationException: if the add operation is not supported by this list.
IllegalArgumentException: if some property of the specified element prevents it from being added to this list.
IndexOutOfBoundsException: if the index is out of range (index size()).

Below program illustrates the add(int index, int position) function of AbstractList class :

Program 1:

// Java code to illustrate AbstractList 
// add(int index, int position) method 
  
import java.io.*; 
import java.util.*; 
  
public class ArrayListDemo { 
    public static void main(String[] args) 
    { 
  
        // Create an empty list 
        // with an initial capacity 
        AbstractList<Integer> list 
            = new ArrayList<Integer>(5); 
  
        // Use add() method 
        // to add elements in the list 
        list.add(3); 
        list.add(6); 
        list.add(9); 
        list.add(12); 
  
        // Prints all the elements 
        // available in list 
        System.out.println("Before: "
                           + list); 
  
        // Add(int index, int element) method 
        list.add(1, 4); 
  
        // Prints all the elements 
        // after the above method 
        System.out.println("After: "
                           + list); 
    } 
} 

Output:

Before: [3, 6, 9, 12]
After: [3, 4, 6, 9, 12]

Program 2:

// Java code to illustrate AbstractList 
// add(int index, int position) method 
  
import java.io.*; 
import java.util.*; 
  
public class ArrayListDemo { 
    public static void main(String[] args) 
    { 
  
        // Create an empty list 
        // with an initial capacity 
        AbstractList<String> list 
            = new ArrayList<String>(5); 
  
        // Use add() method 
        // to add elements in the list 
        list.add("Geeks"); 
        list.add("for"); 
        list.add("Computer"); 
        list.add("Portal"); 
  
        // Prints all the elements 
        // available in the list 
        System.out.println("Before: " + list); 
  
        // Add(int index, int element) method 
        list.add(2, "Geeks"); 
  
        // Prints all the elements 
        // after the above method 
        System.out.println("After: " + list); 
    } 
} 

Output:

Before: [Geeks, for, Computer, Portal]
After: [Geeks, for, Geeks, Computer, Portal]

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/AbstractList.html#add(int, %20E)

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