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'equals()' method which does not check class of parameter

Reports equals() methods that do not check the type of their parameter.

Failure to check the type of the parameter in the equals() method may result in latent errors if the object is used in an untyped collection.


class MyClass { int x; @Override public boolean equals(Object obj) { // equals method should return false if obj is not MyClass return ((MyClass)obj).x == x; } }

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 | Probable bugs


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