Java Collections unmodifiableNavigableSet() Method

The unmodifiableNavigableSet() method of Java Collections class is used to get an unmodifiable view of the specified navigable set.

Syntax

Following is the declaration of unmodifiableNavigableSet() method:

Parameter

Parameter	Description	Required/Optional
s	It is the navigable set for which an unmodifiable view is to be returned.	Required

Returns

The unmodifiableNavigableSet() method returns an unmodifiable view of the specified navigable set.

Exceptions

Compatibility Version

Java 1.8 and above

Example 1

import java.util.*;
public class CollectionsUnmodifiableNavigableSetExample1 {
	public static void main(String[] args) {
		NavigableSet<Integer> set = new TreeSet<>();
            Collections.addAll(set, 1,2,3,4,5);
            System.out.println("Initial Set: " + set);
            NavigableSet<Integer> set2 = Collections.unmodifiableNavigableSet(set);
            System.out.println("Unmodifiable Navigable Set: " + set2);
            //Modifying the original set
            set.add(15);
            System.out.println("Unmodifiable Navigable Set: " + set2);
	      }
}

Test it Now

Output:

Initial Set: [1, 2, 3, 4, 5]
Unmodifiable Navigable Set: [1, 2, 3, 4, 5]
Unmodifiable Navigable Set: [1, 2, 3, 4, 5, 15]

Example 2

import java.util.*;
public class CollectionsUnmodifiableNavigableSetExample2 {
	public static void main(String[] args) {
		NavigableSet<String> set = new TreeSet<>();
            Collections.addAll(set, "Google", "Facebook", "Instagram");
            System.out.println("Initial Set: " + set);
            NavigableSet<String> set2 = Collections.unmodifiableNavigableSet(set);
            System.out.println("Unmodifiable Navigable Set: " + set2);
            //Modifying the original set
            set.add("Twitter");
            System.out.println("Unmodifiable Navigable Set: " + set2);
	      }
}

Test it Now

Output:

Initial Set: [Facebook, Google, Instagram]
Unmodifiable Navigable Set: [Facebook, Google, Instagram]
Unmodifiable Navigable Set: [Facebook, Google, Instagram, Twitter]

Example 3

import java.util.*;
public class CollectionsUnmodifiableNavigableSetExample3 {
	public static void main(String[] args) {
		NavigableSet<Integer> set = new TreeSet<>();
            Collections.addAll(set, 11, 13, 17);
            System.out.println("Original Set: " + set);
            NavigableSet<Integer> set2 = Collections.unmodifiableNavigableSet(set);
            set2.add(19);
	      }
}

Test it Now

Output:

Original Set: [11, 13, 17]
Exception in thread "main" java.lang.UnsupportedOperationException
	at java.base/java.util.Collections$UnmodifiableCollection.add(Collections.java:1056)
	at myPackage.CollectionsUnmodifiableNavigableSetExample3.main(CollectionsUnmodifiableNavigableSetExample3.java:9)

Next TopicJava Collections Class

← prev next →