i want to run a processing application in my computer.however,i neither have java,nor i have processing.now,to run the app,what should i install,java jre,jdk,processing,or what?please answer,thanks in advance!

i am working on a project in which i have to communicate with arduino,read 4 different sensor values and then do the work with them.i tried using arudino library,but it does not work.guess,i'd have to use serial.please give the code for serial communication.i have tried using the example sketches with processing,but i need a better explanation.thanks in advance!!!!

how do i read the size of computer screen in pixels in processing?please give a functional code.thanks in advance!!

i am making a mouse with arduino,such that it would control the mouse cursor with potentiometers,using processing. i have completed the arduino and mouse control part,but i want the processing app to run in background, so that it is invisible to the user.how do i do it?also, can i make an equivalent with visual basic,or c++?if yes,how do i control the cursor,and what about the input?thanks in advance!!

is it possible to use processing to compile java?i am asking this since the current process of compiling java is very tiring and processin allows for a user friendly interface.if it is not possible,please suggest alternatives.thanks in advance.