为什么即使我要具体导入确切的类，Class.forName也会引发ClassNotFoundException异常？

Question

I have the following code:

Class<?> classType = Class.forName(typeClassName);

It keeps throwing an error everytime I try to run the code:

java.lang.ClassNotFoundException: EmailAddress

But I'm speciaifially importing the EmailAddress class into the class that I'm running the first code:

import ie.folder.EmailAddress;

How can this be?

Answer 1

If you are already importing the class there is no need to use reflection, you can just do

Class<EmailAddress> clazz = EmailAddress.class;

You would only really need to use Class.forName if you do not know the class name at the time you compile your program. If you still want to do that, you need to use the fully qualified class name (the imports do not matter, they are not considered at runtime, only during compilation).

Class<?> clazz = Class.forName("ie.folder.EmailAddress");

And you have to deal with the exception if that class could not be found or loaded.