Java On The Web

1. Java On The Web Session 15

2. 0 Memory Upload • JAVA Applets • Colors • Fonts • Drawing Methods • Posting your Applet

3. Applets • An applet is a program that runs embedded in HTML code • They must be viewed either in • Web Browser • Appletviewer

4. 0 GUI Elements • Applets can display GUI elements • Graphical User Interface • Colors • Fonts • Text-Fields, Button , Labels, etc. Button

5. 0 Skeleton • import java.awt.*; • import java.applet; • public class MyApplet extends Applet { • public void init( ){ • } • public void paint(Graphics g){ • //instructions go here • } • }

6. 0 Skeleton • import java.awt.*; • import java.applet; • public class MyApplet extends Applet { • public void init( ){ • } • public void paint(Graphics g){ • //instructions go here • } • }

7. Colors • Colors are made out of 3 values • Each value goes from 0 to 255 • RED • GREEN • BLUE

8. 0 Colors

9. Colors • import java.awt.*; • import java.applet; • public class MyApplet extends Applet { • public void init( ){ • } • public void paint(Graphics g){ • //Your Own • Color MyColor = new Color(50, 200,150); • g.setColor(MyColor); • } • }

10. .setColor(Color) • g.setColor(Color.yellow); • g.setColor(Color.red); • g.setColor(MyColor);

11. Fonts • The constructor Font f = new Font(Type, Style, Size); • import java.awt.*; • import java.applet; • public class MyApplet extends Applet { • public void init( ){a • } • public void paint(Graphics g){ • Font f=new Font(“Tahoma”,Font.PLAIN, 10); • g.setFont(f); • } • }

12. Methods

13. The coordinates 0,0 x y

14. 0,0 0 drawLine 10 10 24 18 g.drawLine(10,10,18,24);

15. 0,0 0 drawRect 10 10 8 10 g.setColor(Color.green); g.drawRect(10,10,8,10);

16. 0,0 0 fillRect 10 10 8 10 g.setColor(Color.green); g.fillRect(10,10,8,10);

17. 0,0 0 drawOval 10 10 8 10 g.setColor(Color.red); g.drawOval(10,10,8,10);

18. 0,0 0 fillOval 10 10 8 10 g.setColor(Color.red); g.fillOval(10,10,8,10);

19. 0,0 0 drawArc 10 10 8 10 g.setColor(Color.blue); g.drawArc(10,10,8,10,0,45);

20. 0,0 0 fillArc 10 10 8 10 g.setColor(Color.blue); g.fillArc(10,10,8,10,0,45);

21. 0,0 0 drawString 10 Blanca 10 g.setColor(Color.Magenta); g.setFont(“Arial”,Font.PLAIN, 30); g.drawString(“Blanca”,10,10);

22. Posting Your Applet • Write your  JAVA code • Compile your code • Make it available

23. The Applet Tag • <applet • CODE="YourClass.class" • WIDTH=www HEIGHT=hhh • IGNORE=""></applet> • Substitute www and hhh for your own width and height. • Substitute YourClass.class with the name of your own class. • The Applet tag should be regarded as any other html tag inside your HTML page.

24. Time to Try it Out Applets on the Web

25. Memory Defragmenter • Drawing Applet Skeleton • Drawing Methods • Colors • Fonts • Posting Applets in the Web • E-mail any questions to blanca@hawaii.edu

26. Task Manager • Post the sample applet from webct on the web, in your website. • Read your e-mail • Visit WebCT, webct.hawaii.edu

27. Task Manager • Post the sample applet from webct on the web, in your website. • Read your e-mail • Visit WebCT, webct.hawaii.edu