Not directly. You cannot simply rename or use a file converter tool like you would for images (PNG → JPG).
A .jar file contains Java bytecode ; a .vxp file contains native machine code for a specific processor architecture (usually ARM). They are not directly compatible .
Search trusted retro-mobile forums for a Java.vxp or J2ME.vxp emulator specifically compiled for your MediaTek phone model.
One of the most reliable ways to convert Java programs into executable formats like .VXP is through dedicated desktop tools.
For the average user? You are better off buying a used Android Go phone.
VXP File Extension: What Is It & How To Open It? - Solvusoft
: This free software allows you to convert Java programs directly into executable formats like .EXE or .VXP .
If you don't have a Windows XP/Vista machine:
Translate the Java lifecycle methods ( startApp , pauseApp , destroyApp ) into the corresponding MRE C-bindings ( mre_apps_init , mre_event_param ).
Higher battery drain and potential lag, as the phone is essentially running an app within an app. 2. Manual Porting (For Developers Only)