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Java Hashtable isEmpty() Method with Example

Hashtable Class isEmpty() method: Here, we are going to learn about the isEmpty() method of Hashtable Class with its syntax and example.
Submitted by Preeti Jain, on February 17, 2020

Hashtable Class isEmpty() method

• isEmpty() method is available in java.util package.
• isEmpty() method is used to check whether this Hashtable maps no key-value pairs or not.
• isEmpty() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• isEmpty() method does not throw an exception at the time of checking the empty status of this Hashtable.

Syntax:

    public boolean isEmpty();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is boolean, it returns true when this Hashtable has no key-value pairs otherwise it returns false.

Example:

// Java program to demonstrate the example 
// of boolean isEmpty() method of Hashtable 

import java.util.*;

public class IsEmptyOfHashtable {
    public static void main(String[] args) {

        //Instantiate a hashtable object  
        Hashtable ht = new Hashtable();

        // By using put() method is to
        // add the linked values in an
        // Hashtable ht
        ht.put(10, "C");
        ht.put(20, "C++");
        ht.put(30, "JAVA");
        ht.put(40, "PHP");
        ht.put(50, "SFDC");

        // Display Hashtable
        System.out.println("Hashtable: " + ht);

        // By using isEmpty() method is to
        // check whether key-value pairs exists 
        // or not in this Hashtable
        boolean status = ht.isEmpty();

        // Display status
        System.out.println("ht.isEmpty(): " + status);
    }
}

Output

Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}
ht.isEmpty(): false