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How to find the length or size of an ArrayList in Java
  • Last Updated : 11 Dec, 2018

Given an ArrayList in Java, the task is to find the length or size of the ArrayList.

Examples:

Input: ArrayList: [1, 2, 3, 4, 5]
Output: 5

Input: ArrayList: [geeks, for, geeks]
Output: 3

The size of the ArrayList can be determined easily with the help of size() method. This method does not take any parameters and returns an integer value which is the size of the ArrayList.

Syntax:

int size = ArrayList.size();

Below is the implementation of the above approach:




// Java program to find the size
// of an ArrayList
  
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws Exception
    {
  
        // Creating object of ArrayList<Integer>
        ArrayList<Integer>
            arrlist = new ArrayList<Integer>();
  
        // Populating arrlist
        arrlist.add(1);
        arrlist.add(2);
        arrlist.add(3);
        arrlist.add(4);
        arrlist.add(5);
  
        // print arrlist
        System.out.println("ArrayList: "
                           + arrlist);
  
        // getting total size of arrlist
        // using size() method
        int size = arrlist.size();
  
        // print the size of arrlist
        System.out.println("Size of ArrayList = "
                           + size);
    }
}


Output:

ArrayList: [1, 2, 3, 4, 5]
Size of ArrayList = 5

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