Sublist from ArrayList

In this article, we will understand how to get sublist from the existing ArrayList.

We just need to specify the from_Index and to_Index to specify the range of sublist using a method defined in ArrayList as below

  1. List subList(int fromIndex, int toIndex)
List subList(int fromIndex, int toIndex)
Note : 
fromIndex is inclusive and toIndex is exclusive
The return value of subList method is again another list

Example :

  1. import java.util.*;
  2.  
  3. public class ArrayListSubList {
  4.     public static void main(String[] args) {
  5.     ArrayList<Integer> list = new ArrayList<Integer>();
  6.       list.add(14);
  7.       list.add(7);
  8.       list.add(21);
  9.       list.add(28);
  10. list.add(35);
  11. list.add(42);    
  12. System.out.println("Original ArrayList : "+list);
  13.      List<Integer> subList = list.subList(1, 3);
  14.      System.out.println("SubList from ArrayList: "+subList);
  15.     }
  16. }
import java.util.*;

public class ArrayListSubList {
	public static void main(String[] args) {
	ArrayList<Integer> list = new ArrayList<Integer>();
      list.add(14);
      list.add(7);
      list.add(21);
      list.add(28);
list.add(35);
list.add(42);	 
System.out.println("Original ArrayList : "+list);
     List<Integer> subList = list.subList(1, 3);
     System.out.println("SubList from ArrayList: "+subList);
	}
}
Note :
The subList method throws IndexOutOfBoundsException – If the specified indexes are out of the range of ArrayList 
(fromIndex < 0  or toIndex > size).

IllegalArgumentException – If the starting index is greater than the end index (fromIndex > toIndex)

.

This is useful if we want to get sublist from the mainlist within some range indexes.

About the Author

Raj
Founder of javainsimpleway.com
I love Java and open source technologies and very much passionate about software development.
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