How to compile a java file Dynamically !!!!

Hi all
The problem is
I have a dynamically created java file ,and i want to compile that file dynamically itself. The file name is stored in a string,
I am using ECLIPSE editor..
How do i compile this java file (which is stored in a string) dynamically?
Pls help me, already wasted a lot of time,
Thanks in advance

In every Tutorial regarding Dynamic Compilation,
It is told to import javax.tools.*..
But i cannot find this package
I am using jdk1.4, is this the reason?
Actually the following packages are needed fro this
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
but i cant finad any..!!!
Please help me

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How to compile a java file Dynamically !!!!

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