Week 6: Methods of OO Programming/14B. The Last Piece, Part 1: The Color Class

First, let's write a class called Color, 
which has no other members than 2 integer class variables:

    BLACK (value 2)
    WHITE (value 1)

These variables must be marked with the 'final' modifier.


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import java.util.Random;
import java.lang.reflect.Field;

public class Test {
    public static void main(String[] args) {
        final Random r = new Random();
        
        System.out.println("Testing the Color class...");

        try {
            Field white = Color.class.getDeclaredField("WHITE");
            System.out.println("WHITE is final: " + (white.getModifiers() > 10));
            System.out.println("WHITE, value: " + Color.WHITE);

            Field black = Color.class.getDeclaredField("BLACK");
            System.out.println("BLACK is final: " + (black.getModifiers() > 10));
            System.out.println("BLACK, value: " + Color.BLACK);
        } catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}



//ADD
class Color {
    // public - allow access from other class
    // static - class-level constants
    // final - cannot be changed
    public static final int BLACK = 2;
    public static final int WHITE = 1;
}



Testing the Color class...
WHITE is final: true
WHITE, value: 1

BLACK is final: true
BLACK, value: 2