The size() method of the List interface in Java is used to get the number of elements in this list. That is, the list size() method returns the count of elements present in this list container.
Syntax:
public int size()
Parameters: This method does not take any parameters.
Return Value: This method returns the number of elements in this list.
Illustration: Assume it to be an integer list
Input : {3,2,1,5,7} Output : 5
Example 1:
Java
// Java program to Illustrate size() method // of List class for Integer value // Importing required classes import java.util.*;
// Main class public class GFG {
// Main driver method
public static void main(String[] arg)
{
// Creating object of ArrayList class
List<Integer> list = new ArrayList<Integer>();
// Populating List by adding integer elements
// using add() method
list.add( 1 );
list.add( 2 );
list.add( 3 );
list.add( 4 );
list.add( 5 );
// Printing elements of List
System.out.println( "Before operation: " + list);
// Getting total size of list
// using size() method
int size = list.size();
// Printing the size of List
System.out.println( "Size of list = " + size);
}
} |
Output
Before operation: [1, 2, 3, 4, 5] Size of list = 5
Example 2:
Java
// Java program to Illustrate size() method // of List class for Integer value // Importing required classes import java.util.*;
// Main class public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating an empty string list by
// declaring elements of string type
List<String> list = new ArrayList<String>();
// Populating List by adding string elements
// using add() method
list.add( "Geeks" );
list.add( "for" );
list.add( "Geeks" );
// Printing the List
System.out.println( "Before operation: " + list);
// Getting total size of list
// using size() method
int size = list.size();
// Printing the size of list
System.out.println( "Size of list = " + size);
}
} |
Output
Before operation: [Geeks, for, Geeks] Size of list = 3