How to Insert all the Collection Elements to the Specified Position in Java ArrayList?

Last Updated : 22 Nov, 2022

The element can be inserted at the collection elements to the specified position in ArrayList using Collection.addAll() method which is present in java.util.ArrayList class. If any element present at the index then that element and all its right side elements are shifted to the right side. this method accepts two arguments the first argument is the index where we want to insert the elements and the second argument is the object of another collection. This method returns a boolean value true if elements are successfully inserted else returns false.

addAll(Collection c) : This method appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection’s Iterator. The behavior of this operation is undefined if the specified collection is modified while the operation is in progress(implies that the behavior of this call is undefined if the specified collection is this list, and this list is nonempty).

Syntax:

public boolean addAll(int i, Collection c);

Exception: This method throws NullPointerException if elements contain one or more null values and c does not permit null elements, or if c or elements are null

Exception: Here two types of exceptions are possible.

IndexOutOfBoundsException − If the index is out of range then it will show Index Out of Bounds Exception.
NullPointerException − If the specified collection is null then it will show Null Pointer Exception.

CODE:

Java

// Java Program to insert Collection element at // specified index  // Importing ArrayList class and Vector class  // of java.util package import java.util.ArrayList; import java.util.Vector;  public class GFG {      // Main driver method     public static void main(String[] args)     {          // Create an ArrayList         ArrayList<String> ArrList = new ArrayList<String>();          // Adding elements in above ArrayList created       // Custom inputs         ArrList.add("Computer");         ArrList.add("Science");         ArrList.add("Portal");         ArrList.add("GeeksforGeeks");          // Display message         System.out.print("The ArrayList is : ");          // Display original ArrayList         System.out.println(ArrList);          // Creating a vector for elements         Vector<String> vector = new Vector<String>();          // Insert elements in vector       // Custom inputs         vector.add("x");         vector.add("y");         vector.add("z");          // Note: Chosen index where added may vary as per         // req Add vector element in arrayList at 1 index         ArrList.addAll(1, vector);          // Display arrayList after insert elements         // at specific indexchosen above         System.out.println(             "List after addition of element at specific index : ");          // Display List after adding element at specific         // index         System.out.println(ArrList);     } }

Output

The ArrayList is : [Computer, Science, Portal, GeeksforGeeks] List after addition of element at specific index :  [Computer, x, y, z, Science, Portal, GeeksforGeeks]