Sealed subclass without state and overridden equals

Reports direct inheritors of sealed classes that have no state and overridden equals() method.

It's highly recommended to override equals() to provide comparison stability, or convert the class to an object to reach the same effect.

Example:

  sealed class Receiver {
      class Everyone : Receiver()
      class User(val id: Int) : Receiver()
  }

The quick-fix converts a class into an object:

  sealed class Receiver {
      object Everyone : Receiver()
      class User(val id: Int) : Receiver()
  }

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.

CanSealedSubClassBeObject

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Kotlin | Probable bugs

Inspection Details
By default bundled with:	IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,
Can be installed with plugin:	Kotlin, 243.23126-IJ

Last modified: 03 December 2024