PublicInnerClass - Intellij Community

Reports public nested classes.

Example:

public class Outer {
    public static class Nested {} // warning
    public class Inner {} // warning
    public enum Mode {} // warning depends on the setting
    public interface I {} // warning depends on the setting
  }

Configure the inspection:

Use the Ignore 'public' inner enums option to ignore public inner enums.
Use the Ignore 'public' inner interfaces option to ignore public inner interfaces.