HELP- Can't Import My Classes

Question

I've just recently gotten into Java development and have been able to make very basic programs?if you could call them that. To basically introduce myself to Java programming, I thought I'd create a simple tab-based text editor (think Microsoft Notepad with the ability to edit multiple files at once). I've created a basic menu bar class file, a tab-based editor pane/window class file, but am having trouble with the class file I'm using to incorporate the two together. I've had Steven Haines' Java 2 from Scratch at-hand for a week or two now (up to date, no; useful to a degree, yes) and have designed the application with a structure similar to the app in the book.
The structure of the main class file:
import java.lang.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import menuBar;
import jPad;
public class jNotepad extends JFrame implements ActionListener
menuBar menu=new menuBar();
jPad jNote=new jPad();
public jNotepad()
super("JNotepad v1.0");
setJMenuBar(menu);
menu.addActionListener(this);
jNote=new jPad();
getContentPane().add(jNote,BorderLayout.CENTER);
setSize(600,300);
setVisible(true);
addWindowListener
new WindowAdapter()
public void windowClosing(WindowEvent closer)
System.exit(0);
public void actionPerformed(ActionEvent performed)
JMenuItem item=(JMenuItem)performed.getSource();
if(item==menu.fNew)
System.out.println("File->New");
else if(item==menu.fOpen)
System.out.println("File->Open...");
else if(item==menu.fClose)
System.out.println("File->Close");
else if(item==menu.fCloseAll)
System.out.println("File->Close All");
else if(item==menu.fSave)
System.out.println("File->Save");
else if(item==menu.fSaveAs)
System.out.println("File->Save As...");
else if(item==menu.fSaveAll)
System.out.println("File->Save All");
else if(item==menu.fPrint)
System.out.println("File->Print");
else if(item==menu.fExit)
System.out.println("File->Exit");
else if(item==menu.eCut)
System.out.println("Edit->Cut");
else if(item==menu.eCopy)
System.out.println("Edit->Copy");
else if(item==menu.ePaste)
System.out.println("Edit->Paste");
else if(item==menu.eDelete)
System.out.println("Edit->Delete");
else if(item==menu.hContents)
System.out.println("Help->Contents");
else if(item==menu.hAbout)
System.out.println("Help->About");
public static void main(String[] args)
jNotepad jNotepadv10=new jNotepad();
For some reason or another, whenever I try to compile the java file into a class file, it gives me an error stating that I need periods after the "import menuBar" and "import jPad." Then if I add the periods and recompile, it says I need identifiers after the periods, so I add asterisk identifier masks and recompile again just to be told the packages menuBar and jPad do not exist. I can't go any further with my program until I resolve this issue. Any assistance would be appreciated.

Answer 1

use package For example pjb is my initals. I like to have top package of all my programs.
At the top of the java file of NotePad.java, should be
package pjb.apps.NotePad;Make sure that java file and compiled class file is in that directory
\pjb\apps\NotePad.java
\pjb\apps\NotePad.class
\pjb\apps\Calculator.class
Ok Now with your imports do the following. A made up JOS program requires apps to use.
\pjb\os\jos.java
\pjb\os\jos.class
In the jos.java i have
import pjb.apps.*;
...jos coding
public void showAppCalculator() {
  Calculator josCalculator = new Calculator();
  josCalculator.show();
...jos codingAnother example is I just want NotePad imported
import pjb.apps.NotePad;
...jos coding
public void showAppNotePad() {
  NotePadjosNotePad = new NotePad();
  josCalculator.show();
...jos codingor make sure the the classes are all in the same directory as your application program.
See http://java.sun.com/docs/books/tutorial/java/interpack/index.html
for more details about packages.
Hope it helps :)