JApplet Problem
| Author |
Message |
romantic_programmer
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 Posted: Thu Nov 01, 2007 3:55 pm Post subject: JApplet Problem |
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This isn't running.. so i was wondering if their is anything wrong with my code.
| Java: |
package AzureGale;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.border.*;
/**
* @author Jeremy Poisson
*
*/
public class MainFile extends JApplet {
private JButton buttonOK;
private JRadioButton small, medium, large;
private JCheckBox pepperoni, mushrooms, greenPeppers;
public void init (){
this. setSize(3200, 300);
ButtonListener b1 = new ButtonListener ();
JPanel mainPanel = new JPanel();
JPanel SizePanel = new JPanel();
Border b1 = BorderFactory. createTitledBorder("Size");
sizePanel. setBorder(b1 );
ButtonGroup sizeGroup = new ButtonGroup();
small = new JRadioButton("Small");
small. setSelected(true);
sizePanel. add(small );
sizeGroup. add(small );
medium = new JRadioButton("medium");
sizePanel. add(medium );
sizeGroup. add(medium );
large = new JRadioButton("large");
sizePanel. add(large );
sizeGroup. add(large );
mainPanel. add(sizePanel );
JPanel topPanel = new JPanel();
Border b2 =
BorderFactory. createTitledBorder("Toppings");
sizePanel. setBorder(b2 );
pepperoni = new JCheckBox("Pepperoni");
topPanel. add(pepperoni );
mushrooms = new JCheckBox("mushrooms");
topPanel. add(mushrooms );
greenPeppers = new JCheckBox("greenPeppers");
topPanel. add(greenPeppers );
mainPanel. add(topPanel );
buttonOK = new JButton("OK");
buttonOK. addActionListoner(b1 );
mainPanel. add(buttonOK );
this. add(mainPanel );
this. setVisible(true);
}
private class ButtonListener implements ActionListener {
public void actionPerformed (ActionEvent e ) {
if (e. getSource() == buttonOK )
{
String tops = "";
if (pepperoni. isSelected())
tops += "Pepperoni\n";
if (mushrooms. isSelected())
tops += "Mushrooms\n";
if (greenPeppers. isSelected())
tops += "Green Peppers\n";
String msg = "You ordered a ";
if (small. isSelected())
msg += "small pizza with ";
if (medium. isSelected())
msg += "medium pizza with ";
if (large. isSelected())
msg += "large pizza with ";
if (tops. equals(""))
msg += "no toppings.";
else
msg += "the following toppings:\n"
+ tops;
JOptionPane. showMessageDialog(buttonOK,
msg, "Your Order",
JOptionPane. INFORMATION_MESSAGE);
pepperoni. setSelected(false);
mushrooms. setSelected(false);
greenPeppers. setSelected(false);
small. setSelected(true);
}
}
}
}
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here are my errors...
Exception in thread "main" java.lang.NullPointerException
at java.awt.Window.init(Unknown Source)
at java.awt.Window.<init>(Unknown Source)
at java.awt.Frame.<init>(Unknown Source)
at java.awt.Frame.<init>(Unknown Source)
at sun.applet.AppletViewer.<init>(Unknown Source)
at sun.applet.StdAppletViewerFactory.createAppletViewer(Unknown Source)
at sun.applet.AppletViewer.parse(Unknown Source)
at sun.applet.AppletViewer.parse(Unknown Source)
at sun.applet.Main.run(Unknown Source)
at sun.applet.Main.main(Unknown Source)
at sun.applet.AppletViewer.main(Unknown Source)
I am so confused... as well I am using Eclipse Platform
Version: 3.3.0 |
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Sponsor
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Barbarrosa
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| Posted: Thu Nov 01, 2007 9:43 pm Post subject: Re: JApplet Problem |
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I think you have to name ButtonListener or Border b1 something different.
| code: |
public void init(){
this.setSize(3200,300);
ButtonListener b1 = new ButtonListener();
JPanel mainPanel = new JPanel();
JPanel SizePanel = new JPanel();
Border b1 = BorderFactory.createTitledBorder("Size");
sizePanel.setBorder(b1);
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romantic_programmer
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| Posted: Thu Nov 01, 2007 9:53 pm Post subject: RE:JApplet Problem |
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Yes i figured that because it kept telling me that it is a duplicate variable...
but when i change ButtonListener it says the local variable is never read.
i am so confused...
to be honest that is my final issue that needs to be resolved.
here is my corrections so far...
| Java: |
package AzureGale;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.border.*;
/**
* @author Jeremy Poisson
*
*/
public class MainFile extends JApplet {
private static final long serialVersionUID = 1L;
private JButton buttonOK;
private JRadioButton small, medium, large;
private JCheckBox pepperoni, mushrooms, greenPeppers;
public void init ()
{
this. setSize(320, 300);
ButtonListener b1 = new ButtonListener ();
JPanel mainPanel = new JPanel();
JPanel SizePanel = new JPanel();
Border b1 =
BorderFactory. createTitledBorder("Size");
SizePanel. setBorder(b1 );
ButtonGroup sizeGroup = new ButtonGroup();
small = new JRadioButton("Small");
small. setSelected(true);
SizePanel. add(small );
sizeGroup. add(small );
medium = new JRadioButton("medium");
SizePanel. add(medium );
sizeGroup. add(medium );
large = new JRadioButton("large");
SizePanel. add(large );
sizeGroup. add(large );
mainPanel. add(SizePanel );
JPanel topPanel = new JPanel();
Border b2 =
BorderFactory. createTitledBorder("Toppings");
SizePanel. setBorder(b2 );
pepperoni = new JCheckBox("Pepperoni");
topPanel. add(pepperoni );
mushrooms = new JCheckBox("mushrooms");
topPanel. add(mushrooms );
greenPeppers = new JCheckBox("greenPeppers");
topPanel. add(greenPeppers );
mainPanel. add(topPanel );
buttonOK = new JButton("OK");
buttonOK. addActionListener((ActionListener) b1 );
mainPanel. add(buttonOK );
this. add(mainPanel );
this. setVisible(true);
}
private class ButtonListener implements ActionListener {
public void actionPerformed (ActionEvent e ) {
if (e. getSource() == buttonOK )
{
String tops = "";
if (pepperoni. isSelected())
tops += "Pepperoni\n";
if (mushrooms. isSelected())
tops += "Mushrooms\n";
if (greenPeppers. isSelected())
tops += "Green Peppers\n";
String msg = "You ordered a ";
if (small. isSelected())
msg += "small pizza with ";
if (medium. isSelected())
msg += "medium pizza with ";
if (large. isSelected())
msg += "large pizza with ";
if (tops. equals(""))
msg += "no toppings.";
else
msg += "the following toppings:\n"
+ tops;
JOptionPane. showMessageDialog(buttonOK,
msg, "Your Order",
JOptionPane. INFORMATION_MESSAGE);
pepperoni. setSelected(false);
mushrooms. setSelected(false);
greenPeppers. setSelected(false);
small. setSelected(true);
}
}
}
}
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chrisciscoioio
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| Posted: Fri Nov 02, 2007 8:07 am Post subject: Re: JApplet Problem |
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From what I have, you can see it in the question below.
You should user e.getSource() == 'Name of reference to object'
and then ethier set a class instance variable at the top to true or false, and return methods out of the privtae class, which should be doing no more than just flipping a switch and returning. |
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romantic_programmer
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| Posted: Sat Nov 03, 2007 12:59 pm Post subject: RE:JApplet Problem |
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but i do have that dont i?
| Java: |
public void actionPerformed (ActionEvent e ) {
if (e. getSource() == buttonOK )
{
String tops = "";
if (pepperoni. isSelected())
tops += "Pepperoni\n";
if (mushrooms. isSelected())
tops += "Mushrooms\n";
if (greenPeppers. isSelected())
tops += "Green Peppers\n";
String msg = "You ordered a ";
if (small. isSelected())
msg += "small pizza with ";
if (medium. isSelected())
msg += "medium pizza with ";
if (large. isSelected())
msg += "large pizza with ";
if (tops. equals(""))
msg += "no toppings.";
else
msg += "the following toppings:\n"
+ tops;
JOptionPane. showMessageDialog(buttonOK,
msg, "Your Order",
JOptionPane. INFORMATION_MESSAGE);
pepperoni. setSelected(false);
mushrooms. setSelected(false);
greenPeppers. setSelected(false);
small. setSelected(true);
}
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Barbarrosa
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| Posted: Tue Nov 06, 2007 11:58 pm Post subject: Re: JApplet Problem |
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You misspelled something:
buttonOK.addActionListoner(b1);
Should be spelled:
buttonOK.addActionListener(b1);
I actually have your program working. Should I post it? |
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romantic_programmer
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| Posted: Wed Nov 07, 2007 11:38 pm Post subject: RE:JApplet Problem |
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nah... where did i spell it wrong?
as well j applets doesn't work at house... VISTA is being gay and not allowing me to access JApplets or anything involving ActiveX. |
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