Compile and run java programs in different directroy

Hi,
I often encounter many problems when I run java programs in the different directories. Like
javac -d dir_name a.java
java -cp dir_name a
Something wired often happens, such as, there is not a.java file in some directory, but javac -d dir_name a.java can still work or "java -cp dir_name a" often doesn't work. Moreover, file_name.jar is also a tough problem and solving compiling problems is often time-consuming.
So I hope to read something about how to compile and run java programs in different directory properly.
Could you pleae give me a detailed description for that or recommend a book or website?
Thanks a lot.

Can you post a small amount of code that does not work, including the directory structure, and the error messages? Some one here can likely explain the problem.

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import java.io.*;
* A class to compile and run java classes.
* @author Mrityunjoy Saha
public class JavaProcessor{
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Compile and run java programs in different directroy

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