Type parameter extends 'final' class

Reports type parameters declared to extend a final class.

Suggests replacing the type parameter with the type of the specified final class since final classes cannot be extended.

Example:

  void foo() {
    List<? extends Integer> list; // Warning: the Integer class is a final class
  }

After the quick-fix is applied:

  void foo() {
    List<Integer> list;
  }

Locating this inspection

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.

TypeParameterExtendsFinalClass

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This inspection depends on the Java feature 'Generics' which is available since Java 5.

Last modified: 18 June 2024