Redundant usage of unmodifiable collection wrappers
Reports redundant calls to unmodifiable collection wrappers from the Collections
class.
If the argument that is passed to an unmodifiable collection wrapper is already immutable, such a wrapping becomes redundant.
Example:
List<String> x = Collections.unmodifiableList(Collections.singletonList("abc"));
After the quick-fix is applied:
List<String> x = Collections.singletonList("abc");
In order to detect the methods that return unmodifiable collections, the inspection uses the org.jetbrains.annotations.Unmodifiable
and org.jetbrains.annotations.UnmodifiableView
annotations. Use them to extend the inspection to your own unmodifiable collection wrappers.
- By ID
Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.
RedundantUnmodifiable
New in 2020.3
Inspection Details | |
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By default bundled with: | |
Can be installed with plugin: | Java, 243.23126 |
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