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