New to Java

Hey everybody,

Well, I was trying to compile a piece of java code from within java program itself.

But, I am having some trouble with this example code which I am learning from:

Here is the code:

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import javax.tools.JavaCompiler.CompilationTask;

public class JVMComp {

    public static void main (String[] args) {
        String sourceFile = "c:/HelloWorld.Java";
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        DiagnosticCollector<JavaFileObject> diagnostics =
            new DiagnosticCollector<JavaFileObject>();
        StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null, null);

        // prepare the source file(s) to compile
        List<File> sourceFileList = new ArrayList <File> ();
        sourceFileList.add (new File (sourceFile));
        Iterable<? extends JavaFileObject> compilationUnits =fileManager.getJavaFileObjectsFromFiles (sourceFileList);
        CompilationTask task = compiler.getTask (null,fileManager, null, null, null, compilationUnits);
        boolean result = task.call();
        if (result) {
            System.out.println ("Compilation was successful");
        } else {
            System.out.println ("Compilation failed");
        }
        try {
            fileManager.close ();
        } catch (IOException e) {
        }
    }
}

Its from [Original Article: Java2S: Java Compiler tools: how you can compile a Java source from inside a Java program|http://www.java2s.com/Code/Java/JDK-6/JavaCompilertoolshowyoucancompileaJavasourcefrominsideaJavaprogram.htm]

I made a few changes to it to accomodate for some errors. But can someone explain to me what is going on in this piece of code.

Just to make it clear, I do not own this code/ it is not mine and will take it out of this forum if required to do so.

Hopefully you all can help me out with this.