is there any concept called "Constant Folding" in java?

Question

is there any concept called "Constant Folding" in java? if yes what is it?

Answer 1

Yes, there is.

From this JavaWorld article:

static final int length = 25;
static final int width = 10;
int res = length * width;

Execution time is not used to multiply those values; instead, multiplication is done at compile time. The code for the following variable assignment is modified to produce bytecode that represents the product of width and length:

int res  = 250;