Have a look at this J2ME tutorial which shows you how to handle the user interface:
http://today.java.net/lpt/a/187
JAD file
Netbeans IDE 5.5 creates a JAD automatically alongside the JAR or you can create a JAD manually in an editor, see:
http://en.wikipedia.org/wiki/JAD_(file_format)
here's...
Invalid file is common - often due to:
1) you are trying to install an unsigned application when your phone options dictate only signed - ie with certificate. Change your phone options to allow unsigned applications.
2) Your midlet or any associated images are too big - depends on the phone
3) a...
Yes you have to create a JAR and a JAD file,load up these to your phone and then install the JAD.
When using the wireless toolkit you create these files - see: "The bin directory contains the compiled MIDlet suite (a .jar file) and the MIDlet suite descriptor (a .jad file)" in the link...
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