Java ArrayList removerange() Function

December 13, 2022

What is an ArrayList?

Arraylist is a part of collection framework in java. It contains some inbuilt function like removeRange() function which can be found in the java.util.ArrayList Package.
It implements the List interface of the collections framework.

Here, in the page we will discuss about the ArrayList’s removeRange() Method in java. To know more about ArrayList in java, you can click on the button given below.

ArrayList removeRange Function:

Arraylist contains several inbuilt functions that are used to perform several operations on arraylist in Java. removeRange function is also an inbuilt method of class ArrayList.
The removeRange function is used to remove all the elements of an ArrayList which lies between the given range.

Syntax:

arraylist_name.removeRange(int FirstIndex, int LastIndex)

Definition of Parameters:

arrayList_name : This is the final list obtained after removing the required elements.

FirstIndex : The parameter 'FirstIndex' contains the starting range of the element from where elements are removed.

LastIndex : The parameter 'LastIndex' contains the ending range of the element from where elements are removed.

Return Type :

No Return Type The function removeRange doesn't have any return type rather it removes the required elements of the given range from the ArrayList.

Exceptions:

IndexOutOfBoundsException : This error occurs if the FirstIndex and LastIndex is out of range for the given ArrayList or FirstIndex > LastIndex

clear() Function in ArrayList

clone() Function in ArrayList

add() Function in ArrayList

addall() Function in ArrayList

Example for Removing Elements From ArrayList of Integers:

Run

import java.util.*;

public class Main{
    public static void main(String[] args){
        ArrayList<Integer> Prep = new ArrayList<>();
        Prep.add(1);
        Prep.add(2);
        Prep.add(3);
        Prep.add(4);
        Prep.add(5);
        
        System.out.println("Arraylist arr : " + Prep);
        Prep.removeRange(2,3);
        System.out.println("After removing Elements : " + Prep);
    }
}

Output:

/tmp/pKjTdJpUHU/Main.java:13: error: removeRange(int,int) has protected access in ArrayList
Prep.removeRange(2,3);
^

You will be getting the above error if you try to directly access or remove the elements of ArrayList class. The removeRange() method is protected. This means that it can only be accessed within the class, package and subclass.
To access the removeRange Function we can extend the Main class as the ArrayList class.

For Example:

Run

import java.util.*;

public class Main extends ArrayList<Integer>{
    public static void main(String[] args){
        Main Prep = new Main();
        Prep.add(1);
        Prep.add(2);
        Prep.add(3);
        Prep.add(4);
        Prep.add(5);
        
        System.out.println("Arraylist arr : " + Prep);
        Prep.removeRange(1,4);
        System.out.println("After removing Elements : " + Prep);
    }
}

Output:

Arraylist arr : [1, 2, 3, 4, 5]
After removing Elements : [1, 5]

In the above Example. we have created an arraylist by extending the Main class, as the Main class inherits all the properties of ArrayList class we can use it an ArrayList.

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