Developing for the Motorola T720
r0.ini writes "Nice step-by-step introduction guide on how to make that cool app for your T720." Worth a read even if you never intend to write a program for your cell phone, for the comparison between BREW and J2ME (and implicitly between Verizon and AT&T).
One friend wanted a tip calculator, which took about 5 minutes after I figured out how everything worked. It is alittle different from standard Java and you're missing some important things such as floating point numbers (float and double are gone). So it does take some getting used to.
Why spend hours researching how to program applications on your cellphone? I stick to simple math, man.
Let's say your bill is $17.48 at a restaurant and you have to leave the tip.
If bad service: Move decimal one place left ($1.748, which you just round to a dollar and three quarters). This is a 10% tip.
If good service: Use the method above, only multiply the amount by two ($1.75 x 2 = $3.50). This is a 20% tip.