如何在Java中双向int转换工作

问题描述

我是Java的新手，想知道double to int如何工作？我理解，它很简单的长整型通过采取低32位，但双（64位）到int（32位）呢？那么从二进制的double中的那些64位是双精度浮点格式（Mantissa），那么如何在内部转换为int？

解决方案

这些都记录在中

（ T 是 int 时，第二步是不相关的） p>

在大多数情况下，我希望这是使用硬件支持实现 - 将浮点数转换为整数通常由CPU处理。

I am new to Java, and wondering how does double to int cast work ? I understand that it's simple for long to int by taking the low 32 bits, but what about double (64 bits) to int (32 bits) ? those 64 bits from double in binary is in Double-precision floating-point format (Mantissa), so how does it convert to int internally ?

解决方案

It's all documented in section 5.1.3 of the JLS.

(The second step here is irrelevant, when T is int.)

In most cases I'd expect this to be implemented using hardware support - converting floating point numbers to integers is something which is usually handled by CPUs.

这篇关于如何在Java中双向int转换工作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！