Open In App

Java Collections emptySet() Method with Examples

Improve
Improve
Like Article
Like
Save
Share
Report

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)


Last Updated : 28 Dec, 2021
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads