Solutions to selected exercises - An Introduction to Graphical User Interfaces with Java Swing - page 290

File: its/ResizeJumpDisplay/DirectionListener.java

1. package its.ResizeJumpDisplay;
2.
3. import java.awt.event.ActionListener;
4. import java.awt.event.ActionEvent;
5.
6. public class DirectionListener implements ActionListener{
7.
8.

private PositionModel posModel;

9.

private ResizeJumpFrame parentFrame;

10.
11.

public DirectionListener(PositionModel pm,ResizeJumpFrame rjf) {

12.

posModel = pm;

13.

parentFrame = rjf;

14.

}

15.

public void actionPerformed(ActionEvent evt) {

16.

String actionComm = evt.getActionCommand();

17.

if (actionComm.equals("Up")){

18.

posModel.moveUP();

19. }

20. else if (actionComm.equals("Down")){

21. posModel.moveDown();

22. }

23. else if (actionComm.equals("Left")){

24. posModel.moveLeft();

25. }

26. else if (actionComm.equals("Right")){

27.

posModel.moveRight();

28.

}

29.
30. parentFrame.repaint();

31.

}

32. }

File: its/ResizeJumpDisplay/ResizeJumpDriver.java

1. package its.ResizeJumpDisplay;
2.
3. public class ResizeJumpDriver
4. {
5. public static void main(String[] args){

6. ResizeJumpFrame rf = new ResizeJumpFrame();

7.

rf.showIt("ResizeJumpFrame");

8.

}

9. }