What is the best way to implement a system to establish program-wide constants? I have a program that spans several files and I want to have a class that stores constants so that they are available for all the other files.
I tried something like this:

in `Constants.java`

```
public final class Constants{
    private Constants(){}
    public static final String EX = "mas";
}

```

and in `test.java`

```
import Constants.*;
public class test{
    public static void main( String[]args){
            System.out.println( EX );
    }
}

```

but I get the following error

```
test.java:1: error: cannot find symbol
import static Constants.*;
              ^
  symbol: class Constants

```

`Constants.java` and `test.java` are in the same dir.