Java Collections unmodifiableSortedSet() Method

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

Syntax

Following is the declaration of unmodifiableSortedSet() method:

Parameter

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

Returns

The unmodifiableSortedSet() method returns an unmodifiable view of the specified Sorted Set.

Exceptions

Example 1

import java.util.*;
public class CollectionsUnmodifiableSortedSetExample1 {
	public static void main(String[] args) {
	      SortedSet<String> set = new TreeSet<String>();
	      //Add values in the set
	      set.add("Facebook");
	      set.add("Twitter");
	      set.add("Whatsapp");
	      set.add("Instagram");
	      //Create a Unmodifiable sorted set
	      SortedSet<String> set2 = Collections.unmodifiableSortedSet(set);
	      System.out.println("Unmodifiable Sorted set is :"+set2);
	      set.add("Google");
	      System.out.println("Unmodifiable Sorted set after modify is:"+set2);
	      }
}

Test it Now

Output:

Unmodifiable Sorted set is :[Facebook, Instagram, Twitter, Whatsapp]
Unmodifiable Sorted set after modify is:[Facebook, Google, Instagram, Twitter, Whatsapp]

Example 2

import java.util.*;
public class CollectionsUnmodifiableSortedSetExample2 {
	public static void main(String[] args) {
		SortedSet<Integer> set = new TreeSet<>();
            Collections.addAll(set, 1, 9, 7);
            System.out.println("Original Set: " + set);
            SortedSet<Integer> set2 = Collections.unmodifiableSortedSet(set);
            System.out.println("Unmodifiable Sorted Set: " + set2);
            //Modifying the original Set
            set.add(10);
            System.out.println("Unmodifiable Sorted Set: " + set2);
	      }
}

Test it Now

Output:

Original Set: [1, 7, 9]
Unmodifiable Sorted Set: [1, 7, 9]
Unmodifiable Sorted Set: [1, 7, 9, 10]

Example 3

import java.util.*;
public class CollectionsUnmodifiableSortedSetExample3 {
	public static void main(String[] args) {
		SortedSet<Integer> set = new TreeSet<>();
            Collections.addAll(set, 1, 4, 7);
            System.out.println("Original Set: " + set);
            SortedSet<Integer> set2 = Collections.unmodifiableSortedSet(set);
            set2.add(10);
	      }
}

Test it Now

Output:

Original Set: [1, 4, 7]
Exception in thread "main" java.lang.UnsupportedOperationException
	at java.base/java.util.Collections$UnmodifiableCollection.add(Collections.java:1056)
	at myPackage.CollectionsUnmodifiableSortedSetExample3.main(CollectionsUnmodifiableSortedSetExample3.java:9)

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