.subList()

In Java, the .subList() method is a powerful feature of the List interface that obtains a portion of the list based on specified indices. This method provides a convenient way to create a sublist containing elements from the original list.

Syntax

List<E> subList (int fromIndex, int toIndex)

• fromIndex: The starting index of the sublist.
• toIndex: The ending index of the sublist. The element at this index is excluded from the sublist.

Example

Below is an example demonstrating the usage of the .subList() method:

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

public class SubListExample {
  public static void main(String[] args) {
    // Create an ArrayList
    ArrayList<String> exampleList = new ArrayList<>();

    // Add elements to the ArrayList
    exampleList.add("Item A");
    exampleList.add("Item B");
    exampleList.add("Item C");
    exampleList.add("Item D");
    exampleList.add("Item E");

    // Use .subList() to obtain a portion of the list
    List<String> subList = exampleList.subList(1, 4);

    // Display the original and sublist
    System.out.println("Original List: " + exampleList);
    System.out.println("SubList (inclusive index 1, exclusive index 4): " + subList);
  }
}

This is the output of the above code:

Original List: [Item A, Item B, Item C, Item D, Item E]
SubList(inclusive index 1, exclusive index 4): [Item B, Item C, Item D]

In this example, the original ArrayList is created with five elements. The .subList(1, 4) call creates a sublist containing elements from index 1 (inclusive) to index 4 (exclusive). The result is then printed to the console.