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Java program to remove all elements from an ArrayList

In this Java program, we are going to learn how to remove all elements from an ArrayList? By IncludeHelp Last updated : December 31, 2023

Problem statement

Given an ArrayList, and we have to remove/clear all elements using Java program.

Removing all elements from an ArrayList

To remove all elements from an ArrayList, you can simply use the ArrayList.clear() method which is called with this object and removes all elements of it.

Java program to remove all elements from an ArrayList

In this program, we have 5 elements which have been added in the ArrayList, the elements are 100, 200, 300, 400 and 500. So, total numbers of elements are 5 and after removing all the elements ArrayList, total number of elements will be 0.

import java.util.ArrayList;

public class Main {
  public static void main(String[] args) {
    //ArrayList object
    ArrayList arrList = new ArrayList();

    //Add elements to Arraylist
    arrList.add("100");
    arrList.add("200");
    arrList.add("300");
    arrList.add("400");
    arrList.add("500");

    System.out.println("Total number of elements in ArrayList: " +
      arrList.size());
    //remove all elements using clear() method
    arrList.clear();
    System.out.println("Total number of elements in ArrayList: " +
      arrList.size());
  }
}

Output

The output of the above example is:

Total number of elements in ArrayList: 5
Total number of elements in ArrayList: 0

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