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)