So I made a folder called util and placed four classes along with program named unit10Assignment in it. I created a package util and typed " package util; " at the top of each one of the classes code like this:
package util;
public class Employee
Then i wrote:
import util.*;
import javax.swing.JOptionPane;
public class unit10Assignment
On top of the program. However when I compile it, it tells me. Anyone know why? I tried playing around with it and it disappeared when I typed in import java.util*; instead but I'm not sure that what my teacher wanted as her example did not have the java in front.
It also says " bad source file" "package does not contain class Employee " However, everything compiled and ran perfectly before I typed in the package statement and I have not made any change to the code since then. If I removed the package statement from the employee class tho, the same message would appear but it would say another class does not exist.
Thanks for any help
Note: whether or not i put java.util or just util, this problem with the bad source still appears.
thanks for any help
I'm going to make the assumption that you have your project set up like this:
util/
Employee.java
unit10Assignment.java
bin/
(If it isn't, that's fine - so long as they're in some folder. bin/ should exist, though.)
The way that packages work is that they're folders on the hard drive - the package you want to import requires that the folder and class you wish to import both exist in that specific folder. This is why packages are handy - you can have two classes named Employee and have them live in completely different locations.*
Here's how you compile these into a package-like structure without the use of an IDE. Substitute $HOME for the full path of your Java class folder.
javac -sourcepath $HOME/util -d $HOME/bin *.java
And here's how you run your main class:
java -cp $HOME/bin util.$MAIN_CLASS
A breakdown of what these flags mean:
-sourcepath instructs javac to look in this specific directory for your source files.-d specifies an output directory for your .class files.-cp instructs java to add this folder to its classpath.
*: Really, really large projects can often use the same name as other classes; if you wanted to use a specific one, you'd have to use the fully-qualified class name for it.
Make sure that:
- the filename matches the class name (e.g.
Employee.java for class Employee)
- the files are inside the corresponding folder according to their package (i.e.
util)
Are you using any IDE? If not, using one realy helps a lot with this kind of things.
