Creating and Using Packages

[dawiz001]

I'm trying to create and use a package. I create the package but when I import it in a differnt file and compile I get an error saying package not found. What could be the problem here?

[MK12]

Could you show us the code please (in CODE tags).
-MK12

[emceenugget]

what does your directory structure look like?

[dawiz001]

directory structure; C:\java\<filename>
I used inside the progam; package polymorphism.gui;
the class file was created inside gui, however when I try to import in a new file; import polymorphism.gui.<publicClassName>; I got a message saying package not found

[dawiz001]

Also I did set the environment variable in Windows: CLASSPATH C:\java\polymorphism\gui;

[MK12]

1. Was the package declaration the first thing in your program? (besides comments)
also, 2. is the class you import also declared properly in the package? and 3. Why are you importing from polymorphism.gui when the class is in the polymorphism.gui package? That's unnecessary (unless I misunderstood)

[dawiz001]

1. Yes the package declaration was the first thing in my program; 2. The class was declared properly in the package...I know this because when I merge the actual class in the next file I'm working with, it worked ok; 3. The class itself is not in polymorphism.gui package...I was referring to the .class file

[MK12]

.. is the class you are importing public?
-MK12

[dawiz001]

Yes MK12 the class I'm trying to import is public...

[emceenugget]

exactly what are the paths of your files? i'm still confused. your actual (relevant) code and actual file locations are more useful than trying to describe the trouble you're having

[angryboy]

and also, why don't you do a simple test to see if your package class path is working correctly.

[dawiz001]

well that's exactly the problem I'm having with the package path...I know my code is working well and I also know that the .class file is located where it is suppose to be...I just can't import it back and get it to work...

[dawiz001]

package polymorphism.music;
import javax.swing.*;

public class SwingConsole{
public static void
run(final JFrame f, final int width, final int height){
SwingUtilities.invokeLater(new Runnable(){
public void run(){
f.setTitle(f.getClass().getSimpleName());
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(width, height);
f.setVisible(true);
}//end run()
});//end SwingUtilities
}//close overloaded run()
}//end public class

[dawiz001]

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import polymorphism.music;

public class Button1 extends JFrame{
private JButton
b1 = new JButton("Button 1"),
b2 = new JButton("Button 2"),
b3 = new JButton("Button 3");
private JTextField txt = new JTextField(10);
private ActionListener bl = new ActionListener(){
public void actionPerformed(ActionEvent e){
String name = ((JButton)e.getSource()).getText();
txt.setText(name);
}
};//end ActionListener
public Button1(){
b1.addActionListener(bl);
b2.addActionListener(bl);
b3.addActionListener(bl);
setLayout(new FlowLayout());
add(b1);
add(b2);
add(b3);
add(txt);
}//end constructor
public static void main(String[] args){
run(new Button1(), 300, 100);
}//end main()
}//end public class

[dawiz001]

that's basically where I reach but i can't seem to get my .class file back from the package...

[angryboy]

the above you said polymorphism.gui, but now you are using polymorphism.music?

well... try this:
1) set your classpath to classpath=.;C:\java
2) make sure you have c:\java\polymorphism\music
3) and put the .class file in the music folder.

[dawiz001]

I think that's where I'm going wrong...the .class file appearing either in the music or gui folder was not the issue...I strongly believe it's with the classpath...I'm using Windows Vista and I set my variable to CLASSPATH and the value to C:\java Is that correct?

[toadaly]

If your package is polymorphism.music, and your code is physically in c:\java\polymorphism\music, and you have your CLASSPATH set to include c:\java, everything will work fine, as long as you compile from the c:\java directory. It won't work right if you are in some other directory at the time you compile.

[dawiz001]

Is that the correct way to set the classpath in Vista?