The CDC is an API built on top of the CLDC and is a more complete subset of the full J2SE API. It also includes an extra package -- the javax.microedition.io package -- containing all the same classes and interfaces defined in CLDC, and more.

Some of the more notable features that CDC includes over and above CLDC include:

• Floating point support (including java.lang.Float, java.lang.Double, and java.lang.StrictMath classes)
  
  
• A classloader class (java.lang.ClassLoader)
  
  
• Support for native processes (java.lang.Process)
  
  
• Advanced multithreaded support (including support for thread groups and more)
  
  
• Serialization classes (java.io.Serialiable and java.io.Externalizable)
  
  
• Reflection API (including java.lang.reflect package)
  
  
• File system support
  
  
• J2SE style network support (java.net)
  
  
• More complete support for the J2SE Collections API
  
  
• The addition of an HttpConnection interface to the javax.microedition.io package. This provides the necessary methods and constants for an HTTP connection.
  
  
• Support for the J2SE java.lang.ref, java.math, java.security, java.security.cert, java.text, java.util.jar, and java.util.zip packages.