Solutions to selected exercises - An Introduction to Graphical User Interfaces with Java Swing - page 280

File: its/Light/LightModel.java

1. package its.Light;
2.
3. public class LightModel {
4. private int currentColors;

5.
6.
7.

public LightModel() {

8.

currentColors = Constants.LIGHT_RED;

9.

}

10.
11.

public void nextColor(){

12.

switch (currentColors) {

13.

case Constants.LIGHT_RED:

14.

currentColors = Constants.LIGHT_RED_ORANGE;

15. break ;

16. case Constants.LIGHT_RED_ORANGE:

17. currentColors = Constants.LIGHT_GREEN;

18. break ;

19. case Constants.LIGHT_GREEN:

20. currentColors = Constants.LIGHT_ORANGE;

21.

break ;

22.

case Constants.LIGHT_ORANGE:

23.

currentColors = Constants.LIGHT_RED;

24.

break ;

25.

default :

26.

System.out.println("ERROR: ILLEGAL COLOR COMBINATION!");

27.

break ;

28.

}

29. }
30.
31. public int getCurrentColors(){

32. return (currentColors);

33. }

34.
35.
36.

public void printColor(){

37.

switch (currentColors) {

38.

case Constants.LIGHT_RED:

39.

System.out.println("RED");

40.

break ;

41.

case Constants.LIGHT_RED_ORANGE:

42.

System.out.println("RED&ORANGE");

43.

break ;

44.

case Constants.LIGHT_GREEN: