Implicitly declared class can be replaced with ordinary class

Reports implicitly declared classes and suggests replacing them with regular classes.

Example (in file Sample.java):

  public static void main() {
      System.out.println("Hello, world!");
  }

After the quick-fix is applied:

public class Sample {
    public static void main() {
        System.out.println("Hello, world!");
    }
}

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.

ImplicitToExplicitClassBackwardMigration

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.

This inspection can help to downgrade for backward compatibility with earlier Java versions.

This inspection depends on the Java feature 'Implicitly declared classes', which is available since Java 21-preview.

New in 2024.1

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