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).
