In addition to the standard CLDC packages, MIDP also includes three additional packages:

• javax.microedition.lcdui -- Defines classes that provide for control over the UI. This package includes both the high-level UI classes (such as Form, Command, DateField, TextField and more), as well as the low-level UI classes (allowing low-level control over the UI).
  
  
• javax.microedition.midlet -- Contains one of the main MIDP classes, the MIDlet class, which provides MIDP applications access to information about the environment in which they are running.
  
  
• javax.microedition.rms -- Defines a set of classes that provide a mechanism for MIDlets to persistently store, and later retrieve, data.