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'Set' can be replaced with 'EnumSet'

Reports instantiations of java.util.Set objects whose content types are enumerated classes. Such Set objects can be replaced with java.util.EnumSet objects.

EnumSet implementations can be much more efficient compared to other sets, as the underlying data structure is a bit vector. Use the quick-fix to replace the initializer with a call to EnumSet.noneOf(). This quick-fix is not available when the type of the variable is a sub-class of Set.


enum MyEnum { FOO, BAR; } Set<MyEnum> enums = new HashSet<MyEnum>();

After the quick-fix is applied:

enum MyEnum { FOO, BAR; } Set<MyEnum> enums = EnumSet.noneOf(MyEnum.class);

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.16690

Last modified: 29 April 2024