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Java Collections unmodifiableSet() Method

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

Syntax

Following is the declaration of unmodifiableSet() method:

Parameter

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

Returns

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

Exceptions

NA

Example 1

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Output:

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

Example 2

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Output:

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

Example 3

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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.CollectionsUnmodifiableSetExample3.main(CollectionsUnmodifiableSetExample3.java:9)





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