恒定折叠在java中有称为“恒定折叠”的概念吗？

Question

java中有没有所谓的“常量折叠”的概念？如果是，是什么

Answer 1

是的，有

从this JavaWorld article（你可以自己用谷歌搜索一下！）：

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;

Answer 2

Constant folding is the process of simplifying constant expressions at compile time. Terms in constant expressions are typically simple literals, such as the integer 2, but can also be variables whose values are never modified, or variables explicitly marked as constant

是的，它存在于Java:Compiler optimizations