Puppy Linux Discussion Forum

When I understand that static and final combinations can be used together, I learned that static and abstract or final and abstract combinations are not permitted in Java while reading this https://www.scaler.com/topics/abstract-keyword-in-java/. However, I have seen the following code elsewhere.

public class Enclosing {

    private static int x = 1;

    public static abstract class StaticNested {

        public abstract void run();
    }
  }

Could someone kindly explain the principle and practical applications of this scenario?