Why jvm doesn't allow me to do calc between a static and a non static variable.

Question

like this
static int i=0;
int a;
a=++i;
error occurs when executed. what is the problem because of which jvm doesn't allow me to do this.

Answer 1

Same reason as here:
https://www.sololearn.com/Discuss/276965/?ref=app
You don't need static in your example. Leave it out.