- String charAt()
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- String concat()
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- String format()
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- start()
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- Java Thread class
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- Socket Class
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- Java Integer Class
- Integer bitCount()
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- Difference between Array and ArrayList
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Java Collections unmodifiableMap() Method21 Mar 2025 | 2 min read The unmodifiableMap() method of Java Collections class is used to get an unmodifiable view of the specified map. SyntaxFollowing is the declaration of unmodifiableMap() method: Parameter
ReturnsThe unmodifiableMap() method returns an unmodifiable view of the specified map. ExceptionsNA Example 1Output:
Initial collection: {key1=Java, key2=Android, key3=JavaScript}
Unmodifiable Map: {key1=Java, key2=Android, key3=JavaScript}
Unmodifiable Map after adding: {key1=Java, key2=Android, key3=JavaScript, key4=TpointTech}
Example 2Output:
Initial Unmodifiable Map: {1=one, 2=two}
Exception in thread "main" java.lang.UnsupportedOperationException
at java.base/java.util.Collections$UnmodifiableMap.put(Collections.java:1453)
at myPackage.CollectionsUnmodifiableMapExample2.main(CollectionsUnmodifiableMapExample2.java:10)
Example 3Output:
Unmodifiable map: {1=1001, 2=1002, 3=1003, 4=1004, 5=1005}
Unmodifiable map after remove(4, 1004): {1=1001, 2=1002, 3=1003, 5=1005}
Next TopicJava Collections Class |
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