java 从double转换到float_关于浮点数：在Java中从double转换为float

如果我正在使用double，并将其转换为float，它如何工作？ 值会被截断以适合浮点数吗？ 还是舍入值不同？ 抱歉，这听起来有点补救，但是我正在尝试掌握float和double转换的概念。

stackoverflow.com/a/2781125/986169

根据Java语言规范的第5.1.3节：

A narrowing primitive conversion from double to float is governed by the IEEE 754 rounding rules (§4.2.4). This conversion can lose precision, but also lose range, resulting in a float zero from a nonzero double and a float infinity from a finite double. A double NaN is converted to a float NaN and a double infinity is converted to the same-signed float infinity.

第4.2.4节说：

The Java programming language requires that floating-point arithmetic behave as if every floating-point operator rounded its floating-point result to the result precision. Inexact results must be rounded to the representable value nearest to the infinitely precise result; if the two nearest representable values are equally near,