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Java On The Web

Java On The Web. Session 15. 0. Memory Upload. JAVA Applets Colors Fonts Drawing Methods Posting your Applet. Applets. An applet is a program that runs embedded in HTML code They must be viewed either in Web Browser Appletviewer. 0. GUI Elements. Applets can display GUI elements

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Java On The Web

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  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

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