Java – sharing constants in multiple classes (Android Minesweeper)

I'm using the extended button to create an instance of a class and directly access integer variables for better performance. I'm using constants to easily identify the current settings of variables

I have constant declarations and instantiate them in the button class and activity class. I found a similar problem, and it's not good to create a class just to keep constants

What is the best way to use the same constant declaration in both classes?

I'm a beginner programmer, so I probably ignored a simple solution

Button class:

public class GridButton extends Button {
  public int displayStatus;

  // constants for mine display status
  private static final int UNTOUCHED = 1;
  private static final int UNCOVERED = 2;
  private static final int FLAGGED = 3;
  private static final int HIT = 4;
  ...
}

Activity class:

public class PlayGameActivity extends Activity {      
  private GridButton[][] gridButtons;      

  // constants for mine display status
  private static final int UNTOUCHED = 1;
  private static final int UNCOVERED = 2;
  private static final int FLAGGED = 3;
  private static final int HIT = 4;
  ...

  // e.g. accessing displayStatus value
  if (gridButtons[currentRow][currentColumn].displayStatus == FLAGGED)
  {
  }
}

resolvent:

To share content, you can create constants in separate classes and access them statically

class Constants {
  public static final int UNTOUCHED = 1;
}

Then in these two courses, you can go to constants. Untouched

In this case, I will avoid using magic numbers and replace them with enum

enum DisplayStatus {
  Untouched, Uncovered, Flagged, Hit
}

And replace all int displaystatus with displaystatus displaystatus. Now you and other readers have a clear understanding of what int represents

Ideally, you always want to use a specific type to limit the range of possible values. In your example, only the numbers 1-4 are valid, but your type is as wide as int, so it can be any value (such as - 1 or 23543)

Good luck!