i++ & 和有什么不一样?++i 在 for 循环中? [英] What is the difference between i++ & ++i in a for loop?

问题描述

我刚刚开始学习 Java，现在我开始学习 for 循环语句.我不明白 ++i 和 i++ 如何在 for 循环中工作.

I've just started learning Java and now I'm into for loop statements. I don't understand how ++i and i++ works in a for-loop.

他们在加减法等数学运算中是如何工作的?

How do they work in mathematics operations like addition and subtraction?

推荐答案

它们都增加了数字.++i 等价于 i = i + 1.

They both increment the number. ++i is equivalent to i = i + 1.

i++ 和 ++i 非常相似但不完全相同.两者都增加数字，但 ++i 在计算当前表达式之前增加数字，而 i++ 在计算表达式之后增加数字.

i++ and ++i are very similar but not exactly the same. Both increment the number, but ++i increments the number before the current expression is evaluted, whereas i++ increments the number after the expression is evaluated.

int i = 3;
int a = i++; // a = 3, i = 4
int b = ++a; // b = 4, a = 4

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