This code wont run ,but no error.

[Ric Luper]

Hi, thankyou for reading my post.

How do I find out what is wrong with my code? Im using JEdit on a Mac , this code compiles but wont run. Ive made a mistake but cant see it for looking. Im not a java programmer and dont understand what i have done wrong. It doing my head in so I hope you can help.

I typed javac cardGUI1.java at the prompt
I then typed java cardGUI1

The java thing (what is it called) opened up and displayed the class name, it then shut down about a second later.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
 
public class cardGUI1 extends JFrame {
 
//declare components and container
private Container container;
private GridBagLayout gbLayout;
private GridBagConstraints gbConstraints;
 
//create the components
 
 
 
public cardGUI1(){
 
super("card GUI dev");
 
// declare the components
JButton buttonTry, buttonNext;
JLabel question;
JTextField answer;
JComboBox choose;
 
// add gbConstaints to the heap
gbConstraints =new GridBagConstraints();
 
 
// what does getContentPane do?
container = getContentPane();

// add gbLayout to the heap
gbLayout  = new GridBagLayout();

// set the layout format to gbLayout
container.setLayout(gbLayout);
 
// add the components to the heap
buttonTry = new JButton("try");
buttonNext = new JButton("next");
//answer = new JTextField(20);
question = new JLabel("add the question");
 
// remember the size of an array must be known at construction time
String choices[] =  {"Question","Answer"};
 
choose = new JComboBox(choices);
 
// add components to container

 addComponent(choose,0,0,2,1);
 addComponent(question,1,0,2,1);
 //addComponent(answer,2,0,2,1);
 addComponent(buttonTry, 3, 0,1,1);
 addComponent(buttonNext, 3,1,1,1);
 
 
 
} // close cardGUI1
 
// addCompoment method is programmer deifned
 
private void addComponent (Component c, int row, int column, int width, int
                           height)
{
// set gridx and gridy
gbConstraints.gridx = column;
gbConstraints.gridy = row;
 
// set gridwidth
gbConstraints.gridwidth = width;
gbConstraints.gridheight = height;
 
// set constraints what does this do?
gbLayout.setConstraints(c, gbConstraints);
container.add(c);//add component
 
}
 
 
 
 
public static void main(String args []){
 
 
 
// adds a I of cardGUI1 to the heap at run time
cardGUI1 app = new cardGUI1();
 
 
app.addWindowListener(
 
        new WindowAdapter()
        {
        public void windowClosing(WindowEvent e)
        {
        System.exit(0);
        }
 
        }
 
); 
 
};// close main
 
 
 
}

//JAM -- Edited [CODE] and [/CODE] tags.
[ May 16, 2005: Message edited by: Joel McNary ]

[Michael Dunn]

change
java cardGUI1

to
javaw cardGUI1

[Ric Luper]

Hi
Thank you for trying to help but that command was not found.

[miguel lisboa]

you�v to add this:

 public static void main(String args []){
 

 
// adds a I of cardGUI1 to the heap at run time
cardGUI1 app = new cardGUI1();
app.setSize(200, 200);// set a size
app.setVisible(true); // make it visible

[Ric Luper]

Thank you Miguel, it works great now