Get Sub List of Java ArrayList Example

This Java Example shows how to get sub list of java ArrayList using subList   method by providing start and end index.

import java.util.ArrayList;
import java.util.List;

public class GetSubListOfJavaArrayListExample {

 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");
  arrayList.add("4");
  arrayList.add("5");

  /**
   * To get a sub list of Java ArrayList use List subList(int startIndex,
   * int endIndex) method. This method returns an object of type List
   * containing elements from startIndex to endIndex - 1.
   **/

  List lst = arrayList.subList(1, 3);

  // display elements of sub list.
  System.out.println("Sub list contains : ");
  for (int i = 0; i < lst.size(); i++)
   System.out.println(lst.get(i));

  /**
   * Sub List returned by subList method is backed by original Arraylist.
   * So any changes made to sub list will also be REFLECTED in the
   * original Arraylist.
   **/
  // remove one element from sub list
  Object obj = lst.remove(0);
  System.out.println(obj + " is removed from sub list");

  // print original ArrayList
  System.out.println("After removing " + obj
    + " from sub list, original ArrayList contains : ");
  for (int i = 0; i < arrayList.size(); i++)
   System.out.println(arrayList.get(i));

 }

}

The output is:



Sub list contains :
2
3
2 is removed from sub list
After removing 2 from sub list, original ArrayList contains :
1
3
4
5