发现随机加号，没有语法错误

问题描述

所以，我一直在寻找了一些早期的code和发现，应该是一个语法错误，这种随机加号，但code工作得很好，我不知道为什么。

So, i was looking over some earlier code and found this random plus sign that should have been a syntax error, but the code worked fine and i don't get why

tv_distance.setText("Distance: " + 
        ( dist >= 1000 ? (String.format("%.1f", dist/1000f)) : +dist )
        + " " + metric );

额外加号是三元运算符的第三个操作数：

The extra plus sign is at the third operand of the ternary operator:

() ? () : +dist

所以我失去了什么？

So what am i missing?

推荐答案

DIST 是一个数字。在 + 只是指定的标志。例如， +5 总是相同的 5 ，但它是合法的。很显然，你更熟悉它的反面，如 -5 。

dist is a number. The + is just specifying the sign. For example, +5 is always the same as 5 but it is legal. Obviously, you're much more familiar with its opposite, as in -5.

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