+ =和= +之间有什么区别？ [英] What is the difference between += and =+?

问题描述

+ =和= +之间有什么区别？
具体来说，在java中，但通常也是。

What is the difference between += and =+? Specifically, in java, but in general also.

推荐答案

i += 4;

表示

i = i + 4;  // increase i by 4.

虽然

i =+ 4;

相当于

i = +4;   // assign 4 to i. the unary plus is effectively no-op.

（参见 http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html# jls-15.15.3 对于一元+做什么。）

(See http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.15.3 for what a unary + does.)

这篇关于+ =和= +之间有什么区别？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！