The emptySet() method is used to get the set that has no elements. This method is used in set collection. A set is a data structure that can store unique elements.
Syntax:
public static final <T> Set<T> emptySet()
Parameters: This method will take no parameters.
Return Type: It will return an empty set that is immutable.
Example 1:
Java program to create an empty set
Java
import java.util.*;
public class GFG {
// main method
public static void main(String[] args)
{
// create an empty set
Set<String> data = Collections.<String>emptySet();
// display
System.out.println(data);
}
} |
Output
[]
Example 2:
In this program, we are going to create an empty set and add elements to the set. This method will return an error.
Java
import java.util.*;
public class GFG {
// main method
public static void main(String[] args)
{
// create an empty set
Set<String> data = Collections.<String>emptySet();
// add 3 elements
data.add( "ojaswi" );
data.add( "ramya" );
data.add( "deepu" );
// display
System.out.println(data);
}
} |
Output:
Exception in thread "main" java.lang.UnsupportedOperationException at java.util.AbstractCollection.add(AbstractCollection.java:262) at GFG.main(GFG.java:8)