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ArrayList size() method in Java with Examples
  • Difficulty Level : Basic
  • Last Updated : 26 Nov, 2018

The size() method of java.util.ArrayList class is used to get the number of elements in this list.

Syntax:

public int size()

Returns Value: This method returns the number of elements in this list.

Below are the examples to illustrate the size() method.

Example 1:






// Java program to demonstrate
// size() method
// for Integer value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
        try {
  
            // Creating object of ArrayList<Integer>
            ArrayList<Integer>
                arrlist = new ArrayList<Integer>();
  
            // Populating arrlist1
            arrlist.add(1);
            arrlist.add(2);
            arrlist.add(3);
            arrlist.add(4);
            arrlist.add(5);
  
            // print arrlist
            System.out.println("Before operation: "
                               + arrlist);
  
            // getting total size of arrlist
            // using size() method
            int size = arrlist.size();
  
            // print the size of arrlist
            System.out.println("Size of list = "
                               + size);
        }
  
        catch (IndexOutOfBoundsException e) {
  
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}


Output:

Before operation: [1, 2, 3, 4, 5]
Size of list = 5

Example 2:




// Java program to demonstrate
// size() method
// for String value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
        try {
  
            // Creating object of ArrayList<Integer>
            ArrayList<String>
                arrlist = new ArrayList<String>();
  
            // Populating arrlist1
            arrlist.add("A");
            arrlist.add("B");
            arrlist.add("C");
  
            // print arrlist
            System.out.println("Before operation: "
                               + arrlist);
  
            // getting total size of arrlist
            // using size() method
            int size = arrlist.size();
  
            // print the size of arrlist
            System.out.println("Size of list = "
                               + size);
        }
  
        catch (IndexOutOfBoundsException e) {
  
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}


Output:

Before operation: [A, B, C]
Size of list = 3

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