Can a class be loaded twice?

[MARTIN Herve \(EXT\)]

Hi,

I've created a compiler integrated within a graphical application.
The user writes a script in the language of the application, compiles and
then execute it.

The compilation creates new Java classes which then are loaded into the
application to be executed.

Up to now, the compiler never generates twice a Java class with the same
name, so the same script can be compiled twice, and the class created can be
loaded with non name conflict.

But can't the same class be loaded twice with the same name, provided that
no object of this class is used??

 

[Skippy]

I've created a compiler integrated within a graphical application.

The user writes a script in the language of the application, compiles and
then execute it.

The compilation creates new Java classes which then are loaded into the
application to be executed.

Up to now, the compiler never generates twice a Java class with the same
name, so the same script can be compiled twice, and the class created can be
loaded with non name conflict.

But can't the same class be loaded twice with the same name, provided that
no object of this class is used??

If you generate a class with the same name, all *new* objects will be using
the new version, the old versions will keep using the old class.

 

[Adam Maass]

Hi,

I've created a compiler integrated within a graphical application.
The user writes a script in the language of the application, compiles and
then execute it.

The compilation creates new Java classes which then are loaded into the
application to be executed.

Up to now, the compiler never generates twice a Java class with the same
name, so the same script can be compiled twice, and the class created can be
loaded with non name conflict.

But can't the same class be loaded twice with the same name, provided that
no object of this class is used??

The same class can be loaded arbitrarily many times -- under different
classloaders.

-- Adam Maass

 

[Larry A Barowski]

...

But can't the same class be loaded twice with the same name, provided that
no object of this class is used??

If you use a new URLClassLoader to load the class, everything
will work fine as long as the location of the classes is NOT on
the classpath. Instances of an old and new class with the same
name can coexist with no problem.

-Larry Barowski