Cannot Compile. Pls. help!

Question

I cannot compile the following program which calls for another 6 class files from its code. Please note the main program (DiveLog.java)+the other 6 class files are stored in the same directory.
And also as this involves "package" I tried to compile it as "javac -classpath DiveLog.jav". But I still get the 'cannot resolve symbol' error messages.
DiveLog.java (Main Program)
package DiveLog;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class DiveLog
private JFrame dlframe; //Not assigned yet.
private JTabbedPane tabbedPane; //Not assigned yet.
//Begins Constructor
public DiveLog()
// Create a frame object to add the application GUI components to.
dlframe = new JFrame("A Java(TM) Technology Dive Log");
// Closes from title bar and from menu
dlframe.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
// Tabbed pane with panels for Jcomponents
// Instantiate JTabbedPane with keyword new
tabbedPane = new JTabbedPane(SwingConstants.LEFT);
// Calls method to set color
tabbedPane.setBackground(Color.blue);
tabbedPane.setForeground(Color.white);
populateTabbedPane();
//Calls the method that builds the menu
buildMenu();
dlframe.getContentPane().add(tabbedPane);
dlframe.pack();
dlframe.setSize(765, 690);
dlframe.setBackground(Color.white);
dlframe.setVisible(true);
}// Ends Constructor
private void populateTabbedPane()
// Create tabs with titles
tabbedPane.addTab("Welcome", null, new Welcome(), "Welcome to the Dive Log");
tabbedPane.addTab("Diver Data", null, new Diver(), "Click here to enter diver data");
tabbedPane.addTab("Log Dives", null, new Dives(),
"Click here to enter dives");
tabbedPane.addTab("Statistics", null, new Statistics(),
"Click here to calculate" + " dive statistics");
tabbedPane.addTab("Favorite Web Site", null, new Website(),
"Click here to see a web site");
tabbedPane.addTab("Resources", null, new Resources(),
"Click here to see a list of resources");
} //Ends populateTabbedPane method
// Method header
private void buildMenu()
// Instantiates JMenuBar, JMenu,
// and JMenuItem.
JMenuBar mb = new JMenuBar();
JMenu menu = new JMenu("File");
JMenuItem item = new JMenuItem("Exit");
//Closes the application from the Exit menu item.
item.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
System.exit(0);
} // Closes actionPerformed method
}); // Closes addActionListener method
//Adds the item to the menu object
menu.add(item);
//Adds the menu object with item onto the menu bar
mb.add(menu);
//Sets the menu bar in the frame
dlframe.setJMenuBar(mb);
} //Ends buildMenu method
public static void main(String[] args)
DiveLog dl = new DiveLog();
} //Ends Class
===========================================
Welcome.class (one of the 6 class files.The other 5 are identical to this.)
package divelog;
* This class creates the content on the
* Welcome tabbed pane in the Dive Log
* application.
* @version 1.0
//import for buttons, labels, and images
import javax.swing.*;
//import for layout manager
import java.awt.*;
public class Welcome extends JPanel
{ //Opens class
}//Closes class
=========================================================

Answer 1

Might be a typo when you posted, but your DiveLog class is in package DiveLog, whereas your Welcome class is in package divelog (note the capitalization differences).
And even though they're in the same package, i'm always a fan of importing all the files you're going to need explicitly, such as
import divelog.Welcome
this applies to using the wildcard character too (as in, you shouldn't) to import files. Explicitly listing all imports allows you, and any other developer, to quickly see a list of all classes used.