Package not found

[garet jax]

I have been trying to make packages for common utility classes etc for later use. However with all the packages I try to create, no matter how I do the directory, my import statements always cause an import error saying the package doesn't exist. I've looked at several tutorials, looked at the API and I still don't get it. In case its important, I use TextPad to write, compile and run my current java programs.

I created an example directory and used HelloWorld as the sample program just for simplicity sake.

C:/world/HelloWorld.java is the directory

I included package world; in my HelloWorld program, and it compiled fine.

I opened command prompt and entered the following: set CLASSPATH .;C:\; and it went just fine.

I then successfully compiled my program from command prompt using javac world.HelloWorld

Neither import world.HelloWorld; or import world.*; worked in my other program, which compiles fine before I add that import statement, with the only generated error being that the package doesn't exist. My other import statements for java.swing and javax.awt.event compile fine still.

I then went to my environment variables and added C:\world to both system path (both at the end of the path variable containing the java path and creating a new path for it) and new user path variables.

My import statement still does not compile. The programs compile fine by themselves, but when I try to import any custom made package, I always get "the package does not exist" error.
I've been working through tutorials and forums for days now and I'm hoping someone here can help me out.

[Fubarable]

Please show exactly how you try to compile your code and the exact error message.

[garet jax]

This is the program containing the package code. It compiles fine. It is saved in C:/world
C:/world has been added to system and user variables and set as CLASSPATH using the command prompt.

package world;

public class HelloWorld
{
	public static void main(String[] args)
	{
		System.out.println("Hello World");
	}
}

This is one of my random programs that I try to import it into, and it will not compile with the import world.* statement. Once that import statement has been removed it works fine.

import javax.swing.*;
import java.awt.event.*;
import world.*;

public class Namer extends JFrame
{
	public static void main(String [] args)
	{
		new Namer();
	}
	private JButton buttonOK;
	private JTextField textName;

	public Namer()
	{
		this.setSize(325,100);
		this.setTitle("Character Creation");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		ButtonListener b1 = new ButtonListener();

		JPanel panel1 = new JPanel();

		panel1.add(new JLabel("Enter Your Character's Name: "));

		textName = new JTextField (18);
		panel1.add(textName);

		buttonOK = new JButton("OK");
		buttonOK.addActionListener(b1);
		panel1.add(buttonOK);

		this.add(panel1);
		this.setVisible(true);
	}

	private class ButtonListener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			if (e.getSource() == buttonOK)
			{
				String name = textName.getText();
				if (name.length() == 0)
				{
					JOptionPane.showMessageDialog(
						Namer.this,
					"You need to enter a name for your character.",
					"You need to enter a name for your character.",
					JOptionPane.INFORMATION_MESSAGE);
				}
				else
				{
					JOptionPane.showMessageDialog(
						Namer.this,
					"Welcome" + name,
					"Welcome" + name,
					JOptionPane.INFORMATION_MESSAGE);
				}
				textName.requestFocus();
			}
		}
	}
}

I receive the following error when attempting to compile.

O:\Java\Namer.java:3: error: package world does not exist
import world.*;
^
1 error

Tool completed with exit code 1

[Fubarable]

Please show the whole command line where you try to compile your code.

[garet jax]

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Owner>javac O:\Java\Namer.java
O:\Java\Namer.java:3: error: package world does not exist
import world.*;
^
1 error

C:\Users\Owner>

That is exactly what shows up in the command prompt. I'm not sure if theres a specific BB code for command line prompts or if you wanted a screenshot, but thats the exact error.

[Fubarable]

You don't seem to have the world package in the class path. What if you did something on the lines of

C:\Users\Owner>javac -cp .;C:\ O\Java\Namer.java

[garet jax]

Would that just add the package to the classpath and then compile the program, or will that be adding my namer class to the classpath as well?

Also, it worked when i input that exact code into the command line, however, it didn't actually seem to compile.

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Owner>java O:\Java\Namer
Error: Could not find or load main class O:\Java\Namer

C:\Users\Owner>

It also still fails to compile in the TextPad compiler. Same error, says package world does not exist.

[Fubarable]

Would that just add the package to the classpath and then compile the program, or will that be adding my namer class to the classpath as well?

Try it and see.

Namer doesn't seem to have a package and thus appears to be in the "default" package. I don't advise that you do this since all code should be in a package.

[garet jax]

Once I added Namer to the package, it worked even though namer wasn't in the package directory. Why is that? (Just want to know for curiousity sake)

One last question: Will classes from separate packages be unable to call on each other using import, or is that just a downside of the default package?

[DarrylBurke]

Classes in a named package cannot access classes in the default package.

The reverse isn't true.

db

[garet jax]

Thanks for all the help guys. Glad I joined this community already.