Java Program to insert all elements of other Collection to specified Index of ArrayList

Let us first create an ArraList and add some elements to it −

ArrayList < String > arr = new ArrayList < String > ();
arr.add("50");
arr.add("100");
arr.add("150");
arr.add("200");
arr.add("250");
arr.add("300");

Now, create a new collection. We are creating Vector here −

Vector<String>vector = new Vector<String>();
vector.add("500");
vector.add("700");
vector.add("800");
vector.add("1000");

Now, we will append all the elements of the above Vector to our ArrayList beginning from index 3 −

arr.addAll(3, vector);

Example

 Live Demo

import java.util.ArrayList;
import java.util.Vector;
public class Demo {
   public static void main(String[] args) {
      ArrayList<String>arr = new ArrayList<String>();
      arr.add("50");
      arr.add("100");
      arr.add("150");
      arr.add("200");
      arr.add("250");
      arr.add("300");
      Vector<String>vector = new Vector<String>();
      vector.add("500");
      vector.add("700");
      vector.add("800");
      vector.add("1000");
      // gets added at index 3
      arr.addAll(3, vector);
      System.out.println("Result after append...");
      for (String str: arr)
         System.out.println(str);
   }
}

Output

Result after append...
50
100
150
500
700
800
1000
200
250
300