如何在不进行转换的情况下将double转换为long？ [英] How to convert a double to long without casting?

问题描述

在不投标的情况下将双倍换算为长的最佳方法是什么？

What is the best way to convert a double to a long without casting?

例如：

double d = 394.000;
long l = (new Double(d)).longValue();
System.out.println("double=" + d + ", long=" + l);

推荐答案

假设你很满意截断为零，只是演员：

Assuming you're happy with truncating towards zero, just cast:

double d = 1234.56;
long x = (long) d; // x = 1234

这比通过包装类更快 - 更重要的是，它是更具可读性。现在，如果您需要舍入而不是始终为零，则需要稍微复杂的代码。

This will be faster than going via the wrapper classes - and more importantly, it's more readable. Now, if you need rounding other than "always towards zero" you'll need slightly more complicated code.

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