In this tutorial, we will see how to find length/size of Arraylist in java.
You can use ArrayList’size() method to calculate size of ArrayList.
Let’s understand it with the help of Simple example.
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package com.arpit.java2blog; import java.util.ArrayList; import java.util.List; public class ArrayListLengthMain { public static void main(String args[]) { List<String> countryList=new ArrayList<>(); countryList.add("India"); countryList.add("China"); countryList.add("Bhutan"); countryList.add("Nepal"); System.out.println("Size of Country List is: "+countryList.size()); System.out.println(countryList); countryList.remove(1); countryList.remove(2); System.out.println("Size of Country List is: "+countryList.size()); System.out.println(countryList); } } |
When you run above program, you will get below output:
Size of Country List is: 4
[India, China, Bhutan, Nepal] Size of Country List is: 2
[India, Bhutan]
[India, China, Bhutan, Nepal] Size of Country List is: 2
[India, Bhutan]
As you can see here, size of ArrayList was 4, then we removed two elements from it and size of ArrayList became two.
That’s how you can find length/size of ArrayList in java.
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