Java Collections emptyNavigableSet() Method

The emptyNavigableSet() method of Java Collections class is used to get the empty navigable Set which is immutable in nature.

Syntax

Following is the declaration of emptyNavigableSet() method:

Parameter

This method does not accept any parameter.

Returns

The emptyNavigableSet() method returns an immutable navigable Set which has no element.

Exceptions

Compatibility Version

Java 1.8 and above

Example 1

import java.util.*;
public class CollectionsEmptyNavigableSetExample1 {
	public static void main(String[] args) {		
	     //Create an empty Set   
	     NavigableSet<String> EmpNavSet = Collections.<String>emptyNavigableSet();
	     System.out.println("Empty Navigable Set: "+EmpNavSet);
	     }	  
}	

Test it Now

Output:

Empty Navigable Set: []

Example 2

import java.util.*;
public class CollectionsEmptyNavigableSetExample2 {
	public static void main(String[] args) {		
		//Create an empty Navigable Set
	      NavigableSet<String> EmpNavSet = Collections.emptyNavigableSet();
	      System.out.println("Created empty immutable Navigable Set: "+EmpNavSet);
	      //Try to add elements
	      EmpNavSet.add("A");
	      EmpNavSet.add("B");
	      }	  
}

Test it Now

Output:

Created empty immutable Navigable Set: []
Exception in thread "main" java.lang.UnsupportedOperationException
	at java.base/java.util.Collections$UnmodifiableCollection.add(Collections.java:1056)
	at myPackage.CollectionsEmptyNavigableSetExample2.main(CollectionsEmptyNavigableSetExample2.java:9)

Example 3

import java.util.*;
public class CollectionsEmptyNavigableSetExample3 {
	public static void main(String[] args) {		
		//Create an empty Navigable Set   
	      Set<Integer> empNavSet = Collections.emptyNavigableSet();
	      empNavSet.add(1);
	      empNavSet.add(2);    
	      System.out.println("Created empty immutable Navigable Set: "+empNavSet);	     
	      }	  
}

Test it Now

Output:

Exception in thread "main" java.lang.UnsupportedOperationException
	at java.base/java.util.Collections$UnmodifiableCollection.add(Collections.java:1056)
	at myPackage.CollectionsEmptyNavigableSetExample3.main(CollectionsEmptyNavigableSetExample3.java:7)

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