boolean占用几个字节

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 instructions baload and bastore.2

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.

csdn上的有人这样说

我的结论是：
1）boolean a=true;//这个a在JVM中占4个字节即：32位。
2)boolean[] b = new boolean[10];//数组时，每一个boolean在JVM中占一个字节。
理由：
1）JAVA规范中没有定义boolean类型的大小。
2）但是：在JVM规范第2版中讲得十分清楚。我上边的结论就是从它当中取出来的。
根据：（JVM规范第2版 3.3.4节）
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.
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. 而：Java virtual machine type int, whose values are 32-bit signed two's-complement integers。
Arrays of type boolean are accessed and modified using the byte array instructions
In Sun's JDK releases 1.0 and 1.1, and the Java 2 SDK, Standard Edition, v1.2, boolean arrays in the Java programming language are encoded as Java virtual machine byte arrays, using 8 bits per boolean element.


我比较赞同这一点

我一开始也认为是用int类型表示的 boolean
但boolean 数组的问题 学习下、、、、、