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JAVA APPLETS - 3

JAVA APPLETS - 3. By: Ms. Humaira Siddiqui. Inter-Applet Communication. Example : The HTML file. <HTML> <TITLE> Currency Conversion Demo </TITLE> <BODY> <APPLET CODE=“ GUI.class ” NAME=“first” WIDTH=300 HEIGHT=200> </APPLET>

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JAVA APPLETS - 3

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  1. JAVA APPLETS - 3 By: Ms. HumairaSiddiqui

  2. Inter-Applet Communication

  3. Example : The HTML file <HTML> <TITLE> Currency Conversion Demo </TITLE> <BODY> <APPLET CODE=“GUI.class” NAME=“first” WIDTH=300 HEIGHT=200> </APPLET> <APPLET CODE=“Compute.class” NAME=“second” WIDTH=10 HEIGHT=10> </APPLET> </BODY> </HTML>

  4. Example : The GUI.java applet import java.awt.*; import java.applet.*; public class GUI extends Applet { public void init() { Panel pan = new Panel(); pan.setLayout (new.FlowLayout()); pan.add (new Label(“Riyals”)); TextField r = new TextField(“”, 8); pan.add(r); pan.add (new Label(“Currency”)); TextFieldnc = new TextField(“”, 10); pan.add(nc);

  5. pan.add (new Label(“Result of conversion”)); TextField result = new TextField(“”, 50); pan.add(result); add(“South”, pan); } public booleanhandleEvent(Event v) { if(v.id==Event.WINDOW_DESTROY) System.exit(0); return super.handleEvent(v); }

  6. public boolean action(Event v, Object arg) { int x = Format.atoi(r.getText()); String y = nc.getText(); Compute p = (Compute) getAppletContext.getApplet(“second”); result.setText(r.getText) + “Riyals =” + p.convert(x, y) + nc.getText(); } private TextField r, nc; }

  7. Example : The Compute.java applet import java.awt.*; import java.applet.*; public class Compute extends Applet { public void init() { Panel outp = new Panel(); pan.setLayout (new.FlowLayout()); outp.add (new Label(“Result of conversion:”)); TextField result = new TextField(“”, 50); outp.add(result); add (“South”, outp); }

  8. public int convert(int riyal, String curr) { if(curr.equals “dollar”) return(riyal/4); if(curr.equals “euro”) return(riyal/5); if(curr.equals “xyz”) return(riyal …);

  9. Accessing Image Files

  10. Introduction • An image file can be retrieved from an applet using the getimage() method, which has two different forms: • image getImage(URL a) • image getImage(URL a, String path) ->First form gets an image file specified from the URL ->Second form uses a string to provide a path relative to the URL in the first argument • Typical example of use: • image logo = getImage(getDocumentBase(), “images/logo.gif”);

  11. An Example • Displays two images alternately in response to some window event: <HTML> <APPLET CODE = “ImageView.class” WIDTH=650 HEIGHT=300> <PARAM NAME=“M1” VALUE=“face1.gif”> <PARAM NAME=“M2” VALUE=“face2.gif”> </APPLET> </HTML>

  12. import java.awt.*; import java.applet.*; public class ImageViewextends Applet { boolean flag=true; image x, y; public void init() { x=getImage(getDocumentBase(), getParameter(“M1”)); y=getImage(getDocumentBase(), getParameter(“M2”)); }

  13. public void paint(Graphics g) { if(flag) { g.drawImage(x, 0, 0, this); flag=false; } else { g.drawImage(y, 0, 0, this); flag=true; } } }

  14. Accessing AudioFiles

  15. Introduction • An audio file can be retrieved using the getAudioClip() method, which has two forms: • AudioClipgetAudioClip(URL a) • AudioClip get(URL a, String path) ->First form gets an audio file specified from the URL ->Second form uses a string to provide a path relative to the URL in the first argument • To play an audio clip, we can use the play() method, which also has two different forms: • void play(URL a) • void play(URL a, String path) ->With the same interpretation.

  16. Typical uses of play(): 1 ->AudioClip anthem=getAudioClip(getDocumentBase(), “anthem.au”); Anthem.play(); 2 ->play(getDocumentBase(), “anthem.au”);

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