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  1. 01-06-2011, 08:31 AM #1
    3dprogger
    3dprogger is offline Member
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    Angry Applet doesnt start or it doesnt show

    Hello guys, first of all Im a confirmed C/C++ Programmer. For the school I have to do some homework. This homework should be done in Java Applet:mad:
    I know a bit about Java, but it's illogical and im mystified.

    The homework is to visualize a Black Jack Game
    My problem is that the applet isnt showing a label or button and so on.
    At the start it rests white and that's it.

    My applet code

    Java Code: 
    import java.awt.*;
import java.awt.event.*;
import java.applet.*;

  public class siebzehnvier_applet extends Applet implements ActionListener{
   TextField sname1,sname2,sname3=new TextField("",10);
   Button a,b,c;
   Label label1;
   
   int anzahl = 3;
   String [] spielernamen = new String[anzahl];
   
   Runde r;
  public void init(){
   
   setLayout (null);
   setBackground(new java.awt.Color(231,231,231));
   //setBounds(x,y,Breite, Höhe)
   
   label1 = new Label("Spielernamen eingeben: ");
   label1.setBounds(700,50, 20, 10);
   add(label1);
   
   
   setVisible(true);
   sname1.setEditable(true);
   sname1.addActionListener(this);
   sname1.setBounds(50,50, 30, 12);
   add(sname1);
   sname1.setText("Spielername 1");
   
   
   sname2.setEditable(true);
   sname2.addActionListener(this);
   sname2.setBounds(100,50, 30, 12);
   add(sname2);
   sname2.setText("Spielername 2");
  
   sname3.addActionListener(this);
   sname3.setEditable(true);
   sname3.setBounds(150,50, 30, 12);
   add(sname3);
   sname3.setText("Spielername 3");
   
   
   a = new Button("Annehmen");
   a.addActionListener(this);
   add(a);
   b = new Button("Spielen");
   b.addActionListener(this);
   add(b);
   c = new Button("Beenden");
   c.addActionListener(this);
   add(c);
   validate();
  }

  public void actionPerformed(ActionEvent e){
   Object source= e.getSource();
   if (source==a) {
   spielernamen[0]=sname1.getText();
   spielernamen[1]=sname2.getText();
   spielernamen[2]=sname3.getText();
     
   
   	if ((spielernamen[0]!="Spielername 1")&&(spielernamen[1]!="Spielername 2")&&(spielernamen[2]!="Spielername 3")) {
    r = new Runde(anzahl, spielernamen); 
   }
   
   if (source==b) {   
 	r.Spielstart();	
 	
 	
   }
   
   
   if (source==c) {
    System.exit(0);
   }
   repaint();  
   }
  }
}
    HTML Code
    XML Code: 
    <html>
<head>
<title>Siebzehn und Vier Simulation</title>
</head>
<body text="#000000" bgcolor="#009900" link="#FF0000" alink="#FF0000" vlink="#800000">
<div align="center">
<applet
   code=siebzehnvier_applet.class
   width=800
   height=600>
</applet>
</div>
</body>
</html>
    Hope you know something about my problem
    Last edited by 3dprogger; 01-06-2011 at 08:35 AM.
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  2. 01-06-2011, 10:14 PM #2
    Arthur123
    Arthur123 is offline Member
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    Default

    I've just started applets myself, & I'm curious: are you sure you don't have to put the "" around the myapplet.class in the HTML? Because I do on my site... I'm not sure if that has any effects though, so try it... (if you haven't already).
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  3. 01-07-2011, 07:03 PM #3
    Jodokus's Avatar
    Jodokus
    Jodokus is offline Senior Member
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    @Arthur: the """" are the thing to do, but HTML is very forgiving. It's not the reason.
    @Progger: Java is not forgiving, so forget C. To get you started:
    -use a proper IDE: you need a debugger.
    -classnames start with capitals (convention)
    -mark global fields as private (safer)
    -sname1 and 2 are declared but not initialized ->nullpointer-Exception
    -Stringcomparising in java is done with equals(), not ==.
    -Your comparisonslist is not complete: what if Spieler[0].equals(Spieler[3])?
    -Comparing with String-literals is very demanding on your users.
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