Vector isEmpty() Method in Java

The Java.util.Vector.isEmpty() method in Java is used to check and verify if a Vector is empty or not. It returns True if the Vector is empty else it returns False. 

Syntax:

Vector.isEmpty()

Parameters: This method does not take any parameter. 

Return Value: This function returns True if the Vectoris empty else it returns False. 

Below programs illustrate the Java.util.Vector.isEmpty() method: 

Program 1:

Java

// Java code to illustrate isEmpty()
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);

        // Verifying if the Vector is empty or not
        System.out.println("Is the Vector empty? "
                           + vec_tor.isEmpty());

        // Clearing the Vector
        vec_tor.clear();

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

        // Verifying if the Vector is empty or not
        System.out.println("Is the Vector empty? "
                           + vec_tor.isEmpty());
    }
}

Output:

Vector:  [Welcome, To, Geeks, 4, Geeks]
Is the Vector empty? false
Vector after clear(): []
Is the Vector empty? true

Program 2:

Java

// Java code to illustrate isEmpty()
import java.util.*;

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

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

        // Verifying if the Vector is empty or not
        System.out.println("Is the Vector empty? "
                           + vec_tor.isEmpty());
    }
}

Output:

Vector:  []
Is the Vector empty? true

Time complexity: O(1).
Auxiliary Space: O(1).