Java Programming

I am trying to use this example:

http://tutorials.jenkov.com/java-reflection/dynamic-class-loading-reloading.html

to load some class files outside a package.

public class MainClass {

  public static void main(String[] args){

    ClassLoader classLoader = MainClass.class.getClassLoader();

    try {
        Class aClass = classLoader.loadClass("com.jenkov.MyClass");
        System.out.println("aClass.getName() = " + aClass.getName());
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }

}

But that only seem to work for classes in a package. If I do:

...
    ClassLoader classLoader = MainClass.class.getClassLoader();
    String classPath = C://test//IOUtil.class

    try {
        Class aClass = classLoader.loadClass(classPath);
        System.out.println("aClass.getName() = " + aClass.getName());
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
...

I get the exception:

java.lang.ClassNotFoundException: C:/test/IOUtil.class

In the API:

http://java.sun.com/j2se/1.5.0/docs/api/java/lang/ClassLoader.html#name


it says:

Any class name provided as a String parameter to methods in ClassLoader must be a binary name as defined by the Java Language Specification.

Examples of valid class names include:

"java.lang.String"
"javax.swing.JSpinner$DefaultEditor"
"java.security.KeyStore$Builder$FileBuilder$1"
"java.net.URLClassLoader$3$1"

I assume the error occurs because I don't supply a 'binary name'. But how do I specify a binary name for a local .class file on my disk?