Re: Please thiHelp

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: George Birbilis [MVP J#] [9880] (birbilis_at_kagi.com)
Date: 06/10/04 

Date: Thu, 10 Jun 2004 15:05:25 +0300

grab the book "Thinking in Java" from www.eckel-objects.com (Bruce Eckel has
it for free there)
see the "Applet" section on how to make Java applets

you don't use a "public static void main" method in an Applet class (unless
you also want it to be runnable from the command line as an application)
just do something like:

import java.applet.Applet;

public class MyClass
 extends Applet
{

 public void init(){

 }

 public void start(){

 }

 public void stop(){

 }

 public void destroy(){

 }

}

and fill-in the (optional) init/start/stop/destroy methods there, init is
called when applet is initialized after class loading, start when visible
area is created for the applet and its ready to interact with user, stop
when you go back/forward in the browser and applet should say stop playing
sounds etc. since it's not visible anymore, destroy is called if
windows/browser closes. Start/Stop may be called many times in between if
user goes back/forward a page (some browsers may even call destroy and then
init in such scenario, instead of keeping the applet alive when user goes
back/forward in page navigation history)

cheers,
George

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
George Birbilis <birbilis@kagi.com> [MVP J#] [9880]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ QuickTime VCL and ActiveX controls (for PowerPoint/VB/Delphi etc.)
+ Plugs VCL and ActiveX controls (InterProcess/Internet communication)
+ TransFormations, VB6 forms to ASP.net WebForms convertion
http://www.kagi.com/birbilis
+ Robotics
http://www.mech.upatras.gr/~robgroup
........................................................................

> I tried your applet for the calculation and it worked in java sun but how
do I make the calculations work
> How would i get this one to work with an applet?
> import java.io.*;
>
> class savingsacct
> public static void main (String[] args) throws IOException {
>
> BufferedReader stdin = new BufferedReader
> (new InputStreamReader(System.in));
> // declares three integers
> double num1, num2, sum, dollars; // declares a number that can
>
> have decimals
>
> System.out.print ("What is the amount of your Withdrawl? $");
> System.out.flush();
>
> // read a line, and then converts it to an integer
> num1=Double.parseDouble(stdin.readLine());
>
> System.out.print ("What is the amount of your Deposit? $");
> System.out.flush();
> num2 = Double.parseDouble(stdin.readLine());
>
> sum = num1 - num2; // Adds the two numbers;
> dollars = 1000.09 - sum;
> System.out.println("Your Balance is : $" + dollars);
> } // method main
> }
>
>
> "Lars-Inge Tonnessen" wrote:
>
> >
> > You can't put windows forms in an applet. Please must use awt and layout
> > managers. Java is not as "friendly" as windows when it comes to GUI
> > design. If you don't use layout managers, your applet will look funny on
other
> > operating systems like Macs and Unix/Linuxes.
> >
> > ( Did serialization (save/load) work for your desktop app? )
> >
> >
> >
> > Call this file "gui.java"
> >
> > import java.applet.*;
> > import java.awt.*;
> > import java.awt.event.*;
> >
> > // ActionListener is for the "caclulate" button.
> > public class gui extends java.applet.Applet implements ActionListener
> > {
> > private Label label_header;
> >
> > private TextField text_deposit;
> > private TextField text_withdrawl;
> > private TextField text_Interest;
> > private TextField text_Balance;
> >
> > private Label label_Deposit;
> > private Label label_Withdrawl;
> > private Label label_Interest;
> > private Label label_Balance;
> >
> > private Button but_calc;
> >
> > public void init( )
> > {
> > text_deposit = new TextField();
> > text_withdrawl = new TextField();
> > text_Interest = new TextField();
> > text_Balance = new TextField();
> >
> > but_calc = new Button("Calculate");
> > but_calc.addActionListener( this );
> >
> > label_header = new Label("Status: Ready");
> > label_Deposit = new Label("Deposit :");
> > label_Withdrawl = new Label("Withdrawl :");
> > label_Interest = new Label("Interest :");
> > label_Balance = new Label("Balance :");
> >
> > setLayout( new GridLayout(7,1) );
> > add( label_header );
> >
> > Panel deposit_Panel = new Panel();
> > deposit_Panel.setLayout( new GridLayout(1,3) );
> > deposit_Panel.add( label_Deposit );
> > deposit_Panel.add( text_deposit );
> > deposit_Panel.add( new Label() );
> > add( deposit_Panel );
> >
> > Panel withdrawl_Panel = new Panel();
> > withdrawl_Panel.setLayout( new GridLayout(1,3) );
> > withdrawl_Panel.add( label_Withdrawl );
> > withdrawl_Panel.add( text_withdrawl );
> > withdrawl_Panel.add( new Label() );
> > add( withdrawl_Panel );
> >
> > Panel button_Panel = new Panel();
> > button_Panel.setLayout( new GridLayout(1,3) );
> > button_Panel.add( new Label("") );
> > button_Panel.add( but_calc );
> > button_Panel.add( new Label("") );
> > add( button_Panel );
> >
> > Panel interest_Panel = new Panel();
> > interest_Panel.setLayout( new GridLayout(1,3) );
> > interest_Panel.add( label_Interest );
> > interest_Panel.add( text_Interest );
> > interest_Panel.add( new Label() );
> > add( interest_Panel );
> >
> > Panel balance_Panel = new Panel();
> > balance_Panel.setLayout( new GridLayout(1,3) );
> > balance_Panel.add( label_Balance );
> > balance_Panel.add( text_Balance );
> > balance_Panel.add( new Label() );
> > add( balance_Panel );
> >
> > }
> >
> >
> > // The calculate button was pushed....
> > public void actionPerformed( java.awt.event.ActionEvent event )
> > {
> > Button source = (Button)event.getSource();
> >
> > if ( source == but_calc )
> > {
> > label_header.setText("Calc button!!!");
> > }
> > }
> >
> >
> > }
> >
> >
> >
> > <HTML>
> > <BODY>
> > <center>Banking</center>
> > <BR>
> > </BR>
> > <CENTER>
> > <APPLET CODE="gui.class" WIDTH="200" HEIGHT="150" VIEWASTEXT>Error!
Please enable
> > Java </APPLET>
> > </CENTER>
> > </BODY>
> > </HTML>
> >
> >
> >
> >
> > Regards,
> > Lars-Inge Tonnessen
> >
> >
> >

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