Java Utility Library

Java Hashtable - isEmpty() Method

The java.util.Hashtable.isEmpty() method is used to check whether the hashtable maps no keys to values. It returns true if the hashtable maps no key, else returns false.

Syntax

public boolean isEmpty()

Parameters

No parameter is required.

Return Value

Returns true if the hashtable maps no keys to values, else returns false.

Exception

Example:

In the example below, the java.util.Hashtable.isEmpty() method is used to check whether the hashtable is empty or not.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a hashtable
    Hashtable<Integer, String> Htable = new Hashtable<Integer, String>();

    //checking for empty
    System.out.println("Is Htable empty?: "+ Htable.isEmpty());

    //populating hashtable
    Htable.put(101, "John");
    Htable.put(102, "Marry");
    Htable.put(103, "Kim");
    Htable.put(104, "Jo");

    //checking for empty
    System.out.println("Is Htable empty?: "+ Htable.isEmpty());
  }
}

The output of the above code will be:

Is Htable empty?: true
Is Htable empty?: false

❮ Java.util - Hashtable