The Generic Connection Framework

The Generic Connection Framework :

Since the CDC is a superset of the CLDC, it includes the Generic Connection Framework (GCF). Unlike the CLDC, however, the CDC also requires GCF support for two specific connection types: files and datagrams. This makes sense because the CDC includes the file classes from the java.io package and the datagram classes from the java.net package.

It is therefore straightforward for the device manufacturer to write GCF implementation classes that simply map GCF requests (using the file or datagram protocol at the start of a URL) into their java.io and java.net equivalents.

Using the CDC : http://java.sun.com/javame/technology/cdc/index.jsp

Like the CLDC, the CDC is by itself a limited programming platform. Again, because it does not define any user interface classes or implement any I/O models, about all you can do for output is write to the System.out stream, which may or may not be captured to a console or file. The extra classes defined by one or more J2ME profiles are really required to write interactive applications.