8 replies to this topic

[Chroferus]

I've been studying Java using the tutorial on Sun's website. As I've been going along, I've been adding what I learn to a game prototype. I recently reached the packages chapter and attempted packaging my game. However, after packaging, my files couldn't find each other. I spent a while trying to fix it, and then made a simple package with the following two files:

C:\Users\Kenny\Desktop\testpackage\TestSuperClass.java:

package testpackage;

public class TestSuperClass {


}

C:\Users\Kenny\Desktop\testpackage\TestSubClass.java:

package testpackage;

public class TestSubClass extends TestSuperClass {


}

I can compile TestSuperClass.java, but when I try to compile TestSubClass.java, I get the following error:

TestSubClass.java:2: cannot find symbol

symbol: class TestSuperClass

public class TestSubClass extends TestSuperClass {

                                  ^

My classpath is set with the following line:

set CLASSPATH=C:\Users\Kenny\Desktop\testpackage

Can anyone explain to me what I'm doing wrong?

[Xylyze]

Which IDE are you using?

[Chroferus]

I'm using the 1.6.0_23 version of the JDK.

[wim DC]

With IDE he/she meant your code editor like eclips, netbeans,...

[Chroferus]

I'm not entirely sure I'm even using an IDE. I'm just using Notepad2 to write my Java files and the javac application included in the JDK I installed to compile.

[mnirahd]

Hi,

I would like to suggest you to use IDE like eclipse/Jbuilder.

I think your problem is that you have to create a folder having same name as packet name: and put your source/class files in it.

if you use IDE like Jbuilder: it would make your life easier as it should take care of such things itself.

Munir

[Chroferus]

I'm sure it's in a folder to match the package.

Chroferus said:

C:\Users\Kenny\Desktop\testpackage\TestSuperClass.java:

[B]package testpackage[/B];

public class TestSuperClass {


}

As for the IDE, I might end up trying one, but I really want to understand this error.

[lethalwire]

In some cases it is important that the user learn how to write code with a simple editor like notepad or notepad2.

It allows the new programmer to write their code and learn more about the architecture of programming/compiling/executing/finding errors/classpaths/packages/etc.

To the OP. If you decide NOT to use an IDE I'd recommend doing a google search about how to use packages and set up classpaths.
You are obviously missing a minor detail somewhere in your classpath. You just have to find what that problem is. And that will make you a stronger user.

I came across this with on google:
Java Package Tutorial (English version)

There are many more tutorials out there if this doesn't help you.

[Chroferus]

Thanks. I visited the site and looked how they set the classpath. I copied my file to C:\, changed to the directory, copied the command into my command prompt, and it compiled. The funny part is, I had already looked at that site. But I didn't try setting the classpath the same exact way they did. You were right, there was one small detail I missed.