双字段类型声明为零 [英] double field type declaration as zero

问题描述

以下零双重变量声明之间有什么显着的区别：
0.0 VS 0d

What is significant difference between following zero double variable declaration: 0.0 VS 0d

double d1 = 0.0;
double d2 = 0d;

我知道这两个都比只是 0 ，因为对于代码阅读器来说更为明显。

I understand that both these are better than just 0,because are more obvious for code reader.

但是 0.0 VS 0d 差异对我来说不清楚。

However 0.0 VS 0d difference is not clear for me.

推荐答案

没有区别。看看 Java语言规范，第3.10.2节

There is no difference. Have a look at the Java Language Specification, section 3.10.2

DecimalFloatingPointLiteral：

1. 数位。数位 _opt ExponentPart _opt FloatTypeSuffix _opt


2. 。数字ExponentPart _opt FloatTypeSuffix _opt


3. 数字ExponentPart FloatTypeSuffix _opt


4. Digits ExponentPart _opt FloatTypeSuffix

1. Digits . Digits_opt ExponentPart_opt FloatTypeSuffix_opt
2. . Digits ExponentPart_opt FloatTypeSuffix_opt
3. Digits ExponentPart FloatTypeSuffix_opt
4. Digits ExponentPart_opt FloatTypeSuffix

...

FloatTypeSuffix：

f F d D

都是一个 DecimalFloatingPointLiteral ，第一个类型1，第二个类型4

Both are a DecimalFloatingPointLiteral, the first one type 1, the second one type 4

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