Java problem

Diddy Kong

Im havin trouble makin a basic window with java...see code below..any help/suggestions greatly appreciated

main.java

class ShowAFrame 
{
   
    public static void main(String args[])
    {
      new SimpleFrame();
    }
    
}

SimpleFrame.java

import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JButton;


class SimpleFrame extends JFrame 

{
    public SimpleFrame()
    {
        setTitle("Don't click the button!");
        setLayout(new FlowLayout());
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        add(new JButton("Panic"));
        setSize(300,100);
        setVisible(true);
    }
    
}

there all in a package (using netbeans 4)

Darwin

In main add:

SimpleFrame myFrame = new SimpleFrame();
myFrame.show();

I haven't bothered to run your code, but I presume your code compiles and the Frame is not showing.

HaVoC

put:
SimpleFrame f = new SimpleFrame();
f.pack();
f.setVisible(true);

in your main method you have to run pack() and setVisible(true) for the window to actually appear.

Diddy Kong

nah, they dont seem to help very much, i still get the errors
errors:

java.lang.NoClassDefFoundError: ShowAFrame/main
Exception in thread "main" 
Java Result: 1

Sherifu

Shouldn't main.java be called ShowAFrame.java?

RKM.

Darwin

put:
SimpleFrame f = new SimpleFrame();
f.pack();
f.setVisible(true);

in your main method you have to run pack() and setVisible(true) for the window to actually appear

setVisible has been set to true in the constructor already.

Shouldn't main.java be called ShowAFrame.java?

Of course..didn't spot this.

tempest

getContentPane().add(new JButton("Panic"));

Darwin

Tutorial from Sun microsystems:
http://java.sun.com/docs/books/tutorial/uiswing/learn/example1.html

HaVoC

Darwin wrote:

setVisible has been set to true in the constructor already.




Of course. didn’t spot this.

oh right didn’t spot that just .pack() so in the constructor before .setVisible(true);
.show() has been deprecated by .setVisible(true);

Diddy Kong

cheers lads

GreeBo

rmulryan wrote:

Shouldn't main.java be called ShowAFrame.java?

RKM.

yep
:rolleyes:

moonser

does anyone know where i can download the complete java api file so i dont have to use the book please.

GreeBo

moonser wrote:

does anyone know where i can download the complete java api file so i dont have to use the book please.

1.4.2 JavaDoc

moonser

cheers man

GreeBo

np.