Sharing Annotation Example

UsingMarkerInterface.java

interface Deletable {
}

class Entity implements Deletable {
    // implementation details
}

class ShapeDao extends Entity  {
    // other dao methods
    public boolean delete(Object object) {
        if (!(object instanceof Deletable)) {
            return false;
        }
        // delete implementation details
        return true;
    }
}

public class UsingMarkerInterface {
    public static void main(String[] args) {
        ShapeDao sd = new ShapeDao();
        System.out.println(sd.delete(sd));
    }
}