Constructor assigns value to field defined in superclass

Reports assignment to, or modification of fields that are declared in a superclass from within a subclass constructor.

It is considered preferable to initialize the fields of a superclass in its own constructor and delegate to that constructor in a subclass. This will also allow declaring a field final if it isn't changed after the construction.

Example:

class Super {
  int x;
}
class Sub extends Super {
  Sub(int _x) {
    // Warning: x is declared in a superclass
    x = _x;
  }
}

To avoid the problem, declare a superclass constructor:

class Super {
  final int x;

  Super(int _x) {
    x = _x;
  }
}
class Sub extends Super {
  Sub(int _x) {
    super(_x);
  }
}

Inspection Details
Available in:	IntelliJ IDEA 2023.3, Qodana for JVM 2023.3
Plugin:	Java, 233.SNAPSHOT

Last modified: 13 July 2023