Java Collections emptyNavigableSet() Method with Examples

Last Updated : 03 Jan, 2022

The emptyNavigableSet() method of Java Collections 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> emptyNavigableSet()

Parameters: This will take no parameters.

Return: It will return an empty navigable set that is immutable.

Example 1:

Java

// Java program to create an empty navigable set
import java.util.*;

public class GFG {
    // main method
    public static void main(String[] args)
    {
        // create an empty navigable set
        Set<String> data
            = Collections.<String>emptyNavigableSet();
      
        // display
        System.out.println(data);
    }
}

Output

[]

Example 2: In this program, we are going to create an empty navigable set and add elements to the set. This will return an error.

Java

// Java program to show the exception while
// using Collections emptyNavigableSet() 
// Method
import java.util.*;

public class GFG {
    // main method
    public static void main(String[] args)
    {
        // create an emptyNavigableSet
        Set<String> data
            = Collections.<String>emptyNavigableSet();
      
        // 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.Collections$UnmodifiableCollection.add(Collections.java:1057)
    at GFG.main(GFG.java:10)