Sams Teach Yourself C in 21 Days

More Java Techniques 757

BD6

7: Frame popup = new PopUpWindow(“I am a popup window”);

8: FlowLayout lm = new FlowLayout(FlowLayout.CENTER);

9:

10: public PopUpWindowDemo (String title) {

11: super(title);

12: setLayout(lm);

13: setSize(400, 250);

14: open = new Button(“Show pop-up window”);

15: add(open);

16: quit = new Button(“Quit program”);

17: add(quit);

18: }

19: public static void main(String args[]) {

20: PopUpWindowDemo app = new PopUpWindowDemo (“Pop-up window demo”);

21: app.show();

22: }

23:

24: public boolean action(Event evt, Object arg) {

25: if (evt.target instanceof Button) {

26: String label = (String)arg;

27: if (label.equals(“Show pop-up window”)) {

28: if (!popup.isShowing())

29: popup.show();

30: }

31: else {

32: System.exit(0);

33: }

34: }

35: return true;

36: }

37: }

(See Figure B6.3.)

LISTINGB6.6 continued

OUTPUT

FIGUREB6.3

The output of the pop-

up window demonstra-

tion program.

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