Java.util.ArrayList.size() Method

Description

The java.util.ArrayList.size() method returns the number of elements in this list i.e the size of the list.

Declaration

Following is the declaration for java.util.ArrayList.size() method

public int size()

Parameters

• NA

Return Value

This method returns the number of elements in this list.

Exception

• NA

Example

The following example shows the usage of java.util.Arraylist.size() method.

package com.tutorialspoint;

import java.util.ArrayList;

public class ArrayListDemo {
   public static void main(String[] args) {
      
      // create an empty arraylist with an initial capacity
      ArrayList<Integer> arrlist = new ArrayList<Integer>(5);

      // use add() method to add elements in the list
      arrlist.add(15);
      arrlist.add(20);
      arrlist.add(25);
      arrlist.add(22);

      // let us print all the elements available in list
      for (Integer number : arrlist) {
        System.out.println("Number = " + number);
      }

      // this will print the size of this list
      int retval = arrlist.size();
      System.out.println("Size of list = " + retval); 
   }
}

Let us compile and run the above program, this will produce the following result:

Number = 15
Number = 20
Number = 25
Number = 22
Size of list = 4