Life Cycle
Life Cycle a midlet handled by Application Management Software (AMS). AMS is a cycle place environment from a midlet can to created, run, stopped, also caused. AMS often also called with Java Application Manager (JAM).

Midlet has several state, that is pause, active, destroy. When each state called, several standard method match called. This method be load from J2ME. Following life cycle from a MIDP:

Explanation:
” When midlet first time created and initialize, midlet will stay in state” Pause” .
” In the event of error during midlet construction, midlet will move to state” destroy” , and midlet cancel to created by way of call standard function destroyApp().
” Furthermore, when midlet run, midlet will present in state” Active” , in this case standard function that is called startApp().
” But, if intermediate road midlet stopped temporary, midlet will stay in state” Pause” by way of call standard function pauseApp(). In this state need process cleanup towards garbage collector that produced.

User Interface
User Interface from MIDP consist of high level and low level APIs. Low level API based on in class Canvas. High level API based on in screen. Example of high level is alert, form, list, textbox. Class diagram from interfaces user:

Midlet Suite and Application Descriptor
Before uploading to handphone aplication must be package with extention *.jar. Beside that known also file *.jad that is an application descriptor for describe contents file jar.

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