@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
public @interface Phase {
   int index();
   String displayName() default "";
}

public interface Phased {
}

public interface PhasedMask extends Phased {

   @Phase(index=0)
   public void constrUCt();

   @Phase(index=1)
   public void initialize();

   @Phase(index=2,displayName="Activating...")
   public void activate();

}

public class MyMask implements PhasedMask {

   @Phase(index = 0)
   public void construct() {
      // Do the layout 
   }

   @Phase(index = 1)
   public void initialize() {
      // Fill the mask with data
   }

   @Phase(index = 2)
   public void activate() {
      // Activate the listeners and allow the user to interact with the mask
   }
   
   // Business code

}