The Java.util.HashSet.isEmpty() method is used to check if a HashSet is empty or not. It returns True if the HashSet is empty otherwise it returns False.
Syntax:
Hash_Set.isEmpty()
Parameters: This method does not take any parameter
Return Value: The function returns True if the set is empty else returns False.
Below program illustrate the Java.util.HashSet.isEmpty() method:
// Java code to illustrate contains() import java.io.*;
import java.util.HashSet;
public class HashSetDemo {
public static void main(String args[])
{
// Creating an empty HashSet
HashSet<String> set = new HashSet<String>();
// Use add() method to add elements into the Set
set.add( "Welcome" );
set.add( "To" );
set.add( "Geeks" );
set.add( "4" );
set.add( "Geeks" );
// Displaying the HashSet
System.out.println( "HashSet: " + set);
// Check for the empty set
System.out.println( "Is the set empty: " + set.isEmpty());
// Clearing the set using clear() method
set.clear();
// Again Checking for the empty set
System.out.println( "Is the set empty: " + set.isEmpty());
}
} |
Output:
HashSet: [4, Geeks, Welcome, To] Is the set empty: false Is the set empty: true