Public constructor in abstract class

Reports public constructors of abstract classes.

Constructors of abstract classes can only be called from the constructors of their subclasses, declaring them public may be confusing.

The quick-fix makes such constructors protected.

Example:

  public abstract class Foo {
    public Foo () { // warning: has 'public' modifier
        /* ... */
    }
  }

After the quick-fix is applied:

  public abstract class Foo {
    protected Foo () {
        /* ... */
    }
  }

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.

ConstructorNotProtectedInAbstractClass

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

Configure the inspection:

Use the Ignore for non-public classes option below to ignore public constructors in non-public classes.

Inspection options

Here you can find the description of settings available for the Public constructor in abstract class inspection, and the reference of their default values.

Ignore for non-public classes: Not selected

Inspection Details
By default bundled with:	IntelliJ IDEA 2024.2, Qodana for JVM 2024.2,
Can be installed with plugin:	Java, 242.22892

Last modified: 11 September 2024