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[docs improve] 新增基本数据类型的取值范围

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sam 2022-02-16 13:31:55 +08:00
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docs/java/basis/java-basic-questions-01.md
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@ -640,16 +640,16 @@ Java 中有 8 种基本数据类型，分别为：
这 8 种基本数据类型的默认值以及所占空间的大小如下：
| 基本类型 | 位数 | 字节 | 默认值 |
| :-------- | :--- | :--- | :------ |
| `byte` | 8 | 1 | 0 |
| `short` | 16 | 2 | 0 |
| `int` | 32 | 4 | 0 |
| `long` | 64 | 8 | 0L |
| `char` | 16 | 2 | 'u0000' |
| `float` | 32 | 4 | 0f |
| `double` | 64 | 8 | 0d |
| `boolean` | 1 | | false |
| 基本类型 | 位数 | 字节 | 默认值 | 取值范围 |
| :-------- | :--- | :--- | :------ | ------------------------------------------ |
| `byte` | 8 | 1 | 0 | -128 ~ 127 |
| `short` | 16 | 2 | 0 | -32768 ~ 32767 |
| `int` | 32 | 4 | 0 | -2147483648 ~ 2147483647 |
| `long` | 64 | 8 | 0L | -9223372036854775808 ~ 9223372036854775807 |
| `char` | 16 | 2 | 'u0000' | 0 ~ 65535 |
| `float` | 32 | 4 | 0f | 1.4E-45 ~ 3.4028235E38 |
| `double` | 64 | 8 | 0d | 4.9E-324 ~ 1.7976931348623157E308 |
| `boolean` | 1 | | false | true、false |
对于 `boolean`，官方文档未明确定义，它依赖于 JVM 厂商的具体实现。逻辑上理解是占用 1 位，但是实际中会考虑计算机高效存储因素。