現(xiàn)在簡書有BUG，制作一張表格顯示兩份
1.double 雙精度浮點數(shù)、64 位、其數(shù)據(jù)結(jié)構(gòu)如下：

double.png

tip:計算機指數(shù)寫法 2e10，表示數(shù)學上的2*10^{(10)，而e在數(shù)學上也是個特定的數(shù)值（這真是計算機這邊腦子有坑），在大學剛自學搞代碼的時候懵了一段時間直到我發(fā)現(xiàn)計算機e表示10};
2.float 單精度浮點數(shù)、32 位、其數(shù)據(jù)結(jié)構(gòu)如下：

float.png

3.long 長整型，64位，其數(shù)據(jù)結(jié)構(gòu)如下：

4.int 整型，32位，其數(shù)據(jù)結(jié)構(gòu)如下：

5.short 短整型，16位，其數(shù)據(jù)結(jié)構(gòu)如下：

6.char 字符型,16 位 ,Unicode 字符；
7.byte 字節(jié)型,8位,其數(shù)據(jù)結(jié)構(gòu)如下：

8.boolean 布爾型表示一位的信息；只有兩個取值：true 和 false；占用內(nèi)存大小不確定(單個boolean b 32bit，boolean [] bs 中的item 站8bit 來自1.7 JVM規(guī)范)
Although the java virtual machine defines a boolean type,it only provides very limited support for it.There are no Java virtual machine instructions solely dedicated to operations on boolean values. Instead, expressions in the java programming language that operate on boolean values are compiled to use values of the java virtual machine int data type.
The java virtual machine does directly support boolean arrays. Its newarray instruction enables creation of boolean arrays. Arrays of type boolean are accessed and modified using the byte array instruction baload and bastore .
In oracle java virtual machine implementation, boolean arrays in the java programming language are encoded as java virtual machine byte arrays, using 8 bits per boolean element .
The java virtual machine encodes boolean array components using 1 to represent true and 0 to represent false . Where java programming language boolean values are mapped by compilers to values of java virtual machine type int , the compilers must use the same encoding