Insert all elements of other Collection to Specified Index of Java

/*

  Insert all elements of other Collection to Specified Index of Java

  ArrayList Example

  This Java Example shows how to insert all elements of other Collection object

  at specified index of Java ArrayList object using addAll method.

*/

import java.util.ArrayList;

import java.util.Vector;

public class InsertAllElementsOfOtherCollectionToArrayListExample {

  public static void main(String[] args) {

    //create an ArrayList object

    ArrayList arrayList = new ArrayList();

   

    //Add elements to Arraylist

    arrayList.add("1");

    arrayList.add("2");

    arrayList.add("3");

   

    //create a new Vector object

    Vector v = new Vector();

    v.add("4");

    v.add("5");

   

    /*

      To insert all elements of another Collection to sepcified index of ArrayList

      use

      boolean addAll(int index, Collection c) method.

      It returns true if the ArrayList was changed by the method call.

    */

   

    //insert all elements of Vector to ArrayList at index 1

    arrayList.addAll(1,v);

   

    //display elements of ArrayList

    System.out.println("After inserting all elements of Vector at index 1,

                                                   ArrayList contains..");

    for(int i=0; i<arrayList.size(); i++)

      System.out.println(arrayList.get(i));

  }

}

/*

Output would be

After inserting all elements of Vector at index 1, ArrayList contains..

1

4

5

2

3

*/