Re: Unable to use package...why ???
PortisHead wrote:
First I created the file : Getbcard.java
inside the directory : C:\myclasses\exam\test\dok
below is the script :
package exam.test.dok;
"myclasses" is the root of the classpath for this class. Directories that match up with packages descend from such a root.
public class Getbcard
{
public void setname()
{
System.out.println("Hello");
}
}
then , I compiled it using this command line:
javac Getbcard.java
From what directory? Where is your "exam/test/dok/" directory path? ("exam\test\dok" in Windows.)
and got the appropriated .class file:
Getbcard.class
In what directory?
Next , I created a new file , named : Showbcard.java in folder : C:
\examples
That sounds like a class with no package. Do not mix classes in packages with classes in the "no-package" (the default package, which isn't really a package).
<http://download.oracle.com/javase/tutorial/java/concepts/package.html>
Packages have to match with directories, in the normal filesystem approach. If they do not, you are fubared.
below is the script :
Not a script.
import exam.test.dok.*;
public class Showbcard
{
public static void main(String[] args)
{
System.out.println("Showbcard");
Getbcard i = new Getbcard();
i.setname();
}
}
then , I compiled it using this command line:
javac -cp c:\myclasses Showbcard.java
and got the appropriated .class file:
Showbcard.class
In what directory?
Now when I try to execute the file like :
java -cp c:\myclasses Showbcard
I get the error : Could not find or load main class Showbcard
What am I doing wrong here ?
As mentioned upthread, you left out the package in the class for the "java" command.
<http://download.oracle.com/javase/tutorial/java/package/index.html>
<http://download.oracle.com/javase/tutorial/java/package/managingfiles.html>
Note: Do not use the CLASSPATH variable. Stick with the "-jar" or "-cp" options to set classpath.
<http://download.oracle.com/javase/7/docs/technotes/tools/index.html>
<http://download.oracle.com/javase/7/docs/technotes/tools/windows/javac.html>
<http://download.oracle.com/javase/7/docs/technotes/tools/windows/java.html>
--
Lew