i ++&之间有什么区别? ++ 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，现在我进入了for循环语句.我不明白++i和i++在for循环中如何工作.

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.

它们如何在加减运算等数学运算中起作用?

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

推荐答案

它们都增加数字. ++i等同于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.两者都会增加数字，但是++i会增加对当前表达式求值之前的数字，而i++会增加对表达式求值之后的数字.

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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