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Class explicitly extends a 'Collection' class

Reports classes that extend concrete subclasses of the java.util.Collection or java.util.Map classes.

Subclassing concrete collection types is a common yet poor practice. It is considerably more brittle than delegating collection calls.

Locating this inspection


Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

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 | Java | Inheritance issues


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Java, 241.18072

Last modified: 18 June 2024