Vector size() Method in Java

Last Updated : 11 Jul, 2025
The java.util.vector.size() method in Java is used to get the size of the Vector or the number of elements present in the Vector. Syntax: 
Vector.size()
Parameters: The method does not take any parameter. Return Value: The method returns the size or the number of elements present in the Vector. Below programs illustrate the Java.util.Vector.size() method: Program 1: Vector with string elements. Java 
// Java code to illustrate size()
import java.util.*;

public class VectorDemo {
    public static void main(String args[])
    {
        // Creating an empty Vector
        Vector<String> vec_tor = new Vector<String>();

        // Use add() method to add elements into the Vector
        vec_tor.add("Welcome");
        vec_tor.add("To");
        vec_tor.add("Geeks");
        vec_tor.add("4");
        vec_tor.add("Geeks");

        // Displaying the Vector
        System.out.println("Vector: " + vec_tor);

        // Displaying the size of Vector
        System.out.println("The size is: " + vec_tor.size());
    }
}
Output: 
Vector: [Welcome, To, Geeks, 4, Geeks]
The size is: 5
Program 2: Vector with integer elements. Java 
// Java code to illustrate size()
import java.util.*;

public class VectorDemo {
    public static void main(String args[])
    {
        // Creating an empty Vector
        Vector<Integer> vec_tor = new Vector<Integer>();

        // Use add() method to add elements into the Vector
        vec_tor.add(10);
        vec_tor.add(15);
        vec_tor.add(30);
        vec_tor.add(20);
        vec_tor.add(5);

        // Displaying the Vector
        System.out.println("Vector: " + vec_tor);

        // Displaying the size of Vector
        System.out.println("The size is: " + vec_tor.size());
    }
}
Output: 
Vector: [10, 15, 30, 20, 5]
The size is: 5
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