MIDlet

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A MIDlet is a Java program for embedded devices, more specifically the Java ME virtual machine. Generally, these are games and applications that run on a cell phone.

[edit] Mobile Information Device toolkit

A MIDlet requires a device that implements at least Java ME, CLDC and MIDP to run. Like other Java programs, MIDlets have a "compile once, run anywhere" potential. MIDlet distributions main file is a .jar file, but MIDlet distributions can also consist of a .jad file containing the location of and describing the contents of the .jar file. The implementation of a MIDlet may or may not require the presence of a .jad file.

A MIDlet has to fulfill the following requirements in order to run on a mobile phone:

  • The main class needs to be a subclass of javax.microedition.midlet.MIDlet
  • The MIDlet needs to be packed inside a .jar file (e.g. by using the jar-tool)
  • The .jar file needs to be pre-verified by using a preverifier.
  • In some cases, the .jar file needs to be signed by the mobile phone's carrier.

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