Hashtable isEmpty() Method in Java
The java.util.Hashtable.isEmpty() method of Hashtable class is used to check for the emptiness of the table. The method returns True if no key-value pair or mapping is present in the table else False.
Syntax:
Hash_Table.isEmpty()
Parameters: The method does not take any parameters.
Return Value: The method returns boolean true if the table is empty or does not contain any mapping pairs else boolean false.
Below programs illustrates the working of java.util.Hashtable.isEmpty() method:
Program 1:
// Java code to illustrate the isEmpty() method import java.util.*; public class Hash_Table_Demo { public static void main(String[] args) { // Creating an empty Hashtable Hashtable<String, Integer> hash_table = new Hashtable<String, Integer>(); // Inserting elements into the table hash_table.put("Geeks", 10); hash_table.put("4", 15); hash_table.put("Geeks", 20); hash_table.put("Welcomes", 25); hash_table.put("You", 30); // Displaying the Hashtable System.out.println("The table is: " + hash_table); // Checking for the emptiness of Table System.out.println("Is the table empty? " + hash_table.isEmpty()); } } |
Output:
The table is: {You=30, Welcomes=25, 4=15, Geeks=20}
Is the table empty? false
Program 2:
// Java code to illustrate the isEmpty() method import java.util.*; public class Hash_Table_Demo { public static void main(String[] args) { // Creating an empty Hashtable Hashtable<String, Integer> hash_table = new Hashtable<String, Integer>(); // Displaying the Hashtable System.out.println("The table is: " + hash_table); // Checking for the emptiness of Table System.out.println("Is the table empty? " + hash_table.isEmpty()); } } |
Output:
The table is: {}
Is the table empty? true
Note: The same operation can be performed with any type of variation and combination of different data types.
Whether you're preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, GeeksforGeeks Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we've already empowered, and we're here to do the same for you. Don't miss out - check it out now!
Please Login to comment...