一加二意外地编译 [英] One plus plus two compiles unexpectedly

问题描述

因此，我希望它不会编译，并且不会:

So, I expect this not to compile, and it doesn't:

// the two is inc'd, so reduces symbolically to println(int int)
// which is a compile error
System.out.println(1 ++ 2);

但是确实如此:

System.out.println(1 + + 2);   // returns three

有什么作用?它也不应该编译吗?

What gives? Shouldn't it also not compile?

此外，由于运算符，很难搜索这个问题.

Also, this question is very hard to search for because of the operators..

推荐答案

Java将有效的1 + + 2解释为1加正2.请参见

Java is interpreting the working 1 + + 2 as 1 plus positive 2. See the Unary operator section.

这篇关于一加二意外地编译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！