Java ArrayList.removeRange() Method

protected void removeRange(int fromIndex, int toIndex)

The removeRange() method is used to removes all elements within the specified range from a ArrayList object.
It shifts any succeeding elements to the left (reduces their index).
This call shortens the list by (toIndex - fromIndex) elements. (If toIndex==fromIndex, this operation has no effect.)

Package: java.util

Java Platform: Java SE 8

Syntax:

removeRange(int fromIndex, int toIndex)

Parameters:

Return Value:
This method does not return any value.

Exceptions:
IndexOutOfBoundsException: Thrown if fromIndex or toIndex is out of range (fromIndex < 0 || fromIndex >= size() || toIndex > size() || toIndex < fromIndex).

Accessibility:
As of JDK 17, ArrayList.removeRange(int, int) is declared as protected. This means it can only be accessed within the same package or by subclasses of ArrayList.

Example: ArrayList.removeRange Method

The following example creates an ArrayList with a capacity of 50 elements. Four elements are then added to the ArrayList and the ArrayList is trimmed accordingly.

import java.util.*;

 public class Main extends ArrayList<Integer>{

  public static void main(String[] args) {
      
    // create an empty array list
  	
	 Main arrlist = new Main();

    // use add() method to add values in the list
    arrlist.add(10);
    arrlist.add(12);
    arrlist.add(31);
	
    // print the list
    System.out.println("The list:" + arrlist);

    // removing range of 1st 2 elements
    arrlist.removeRange(0,2);
    System.out.println("The list after using removeRange:" + arrlist);
  }
}

Output:

The list:[10, 12, 31]
The list after using removeRange:[31]

Note: Despite being declared as protected, the removeRange() method is accessible within subclasses of ArrayList, allowing for its usage as demonstrated in the provided example.

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