How to remove a SubList from a List in Java

Input list = [1, 2, 3, 4, 5, 6, 7, 8], fromIndex = 2, endIndex = 4 Output [1, 2, 5, 6, 7, 8] Input list = ['G', 'E', 'E', 'G', 'G', 'K', 'S'], fromIndex = 3, endIndex = 5 Output ['G', 'E', 'E', 'K', 'S']

• Method 1: Using subList() and clear() method

  Syntax:

  List.subList(int fromIndex, int toIndex).clear()
  

  Example: Java

  // Java code to remove a subList using
  // subList(a, b).clear() method
  
  import java.util.*;
  
  public class AbstractListDemo {
      public static void main(String args[])
      {
  
          // Creating an empty AbstractList
          AbstractList<String>
              list = new LinkedList<String>();
  
          // Using add() method
          // to add elements in the list
          list.add("GFG");
          list.add("for");
          list.add("Geeks");
          list.add("computer");
          list.add("portal");
  
          // Output the list
          System.out.println("Original List: "
                             + list);
  
          // subList and clear method
          // to remove elements
          // specified in the range
          list.subList(1, 3).clear();
  
          // Print the final list
          System.out.println("Final List: "
                             + list);
      }
  }
  

  Output:

  Original List: [GFG, for, Geeks, computer, portal]
  Final List: [GFG, computer, portal]
  

  Note: Classes which can inherit AbstractList:
  • ArrayList
  • Vector
  • LinkedList
  • Stack

• Method 2: Using removeRange() method

  Syntax:

  List.removeRange(int fromIndex, int toIndex)
  

  Example: Java

  // Java code to remove a subList
  // using removeRange() method
  
  import java.util.*;
  
  // since removeRange() is a protected method
  // ArrayList has to be extend the class
  public class GFG extends ArrayList<Integer> {
  
      public static void main(String[] args)
      {
  
          // create an empty array list
  
          GFG arr = new GFG();
  
          // use add() method
          // to add values in the list
          arr.add(1);
          arr.add(2);
          arr.add(3);
          arr.add(4);
          arr.add(5);
          arr.add(6);
          arr.add(7);
          arr.add(8);
  
          // prints the list before removing
          System.out.println("Original List: "
                             + arr);
  
          // removing elements in the list
          // from index 2 to 4
          arr.removeRange(2, 4);
          System.out.println("Final List: "
                             + arr);
      }
  }
  

  Output:

  Original List: [1, 2, 3, 4, 5, 6, 7, 8]
  Final List: [1, 2, 5, 6, 7, 8]