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)
