概述
http://download.oracle.com/docs/cd/E17409_01/javase/tutorial/java/nutsandbolts/datatypes.html
boolean: The
总是有人争论。确实一个bit可以表明，但是要看其工作原理，如果其工作是按字节处理数据，显然boolean被定义为一个bit会使得处理比较麻烦，因而不妥。
而我看到的中文论坛中顶多讨论到boolean是可以用1个bit表明，但不是被精确定义的到此为止。
但是作为一个要实现的内容，必须要有明确的定义，而这个定义是在JVM或是其他地方？
据搜，定义是在JVM
http://stackoverflow.com/questions/383551/what-is-the-size-of-a-boolean-variable-in-java
这帖有人给出了测量所占mem的程序例子
That suggests that booleans can basically be packed into a byte each by Sun's JVM.
http://www.velocityreviews.com/forums/t364574-size-of-boolean-type.html#6
It is up to the individual JVM implementation. It is possible that
different amounts of memory will be allocated in different situations.
However, the case that is both most interesting and most measurable is a
large boolean[] array.
I've previously measured it as one byte per element, rounded up to a
multiple of 8 and plus 8 bytes per array overhead. However, your mileage
may vary, and if you really need to know you should measure it on the
system you care about.
Patricia
http://www.daniweb.com/forums/thread33136.html#2
boolean: The
boolean data type has only two possible values:
true and
false. Use this data type for simple flags that track true/false conditions. This data type represents one bit of information, but its "size" isn't something that's precisely defined.
总是有人争论。确实一个bit可以表明，但是要看其工作原理，如果其工作是按字节处理数据，显然boolean被定义为一个bit会使得处理比较麻烦，因而不妥。
而我看到的中文论坛中顶多讨论到boolean是可以用1个bit表明，但不是被精确定义的到此为止。
但是作为一个要实现的内容，必须要有明确的定义，而这个定义是在JVM或是其他地方？
据搜，定义是在JVM
http://stackoverflow.com/questions/383551/what-is-the-size-of-a-boolean-variable-in-java
这帖有人给出了测量所占mem的程序例子
That suggests that booleans can basically be packed into a byte each by Sun's JVM.
http://www.velocityreviews.com/forums/t364574-size-of-boolean-type.html#6
It is up to the individual JVM implementation. It is possible that
different amounts of memory will be allocated in different situations.
However, the case that is both most interesting and most measurable is a
large boolean[] array.
I've previously measured it as one byte per element, rounded up to a
multiple of 8 and plus 8 bytes per array overhead. However, your mileage
may vary, and if you really need to know you should measure it on the
system you care about.
Patricia
http://www.daniweb.com/forums/thread33136.html#2
原文地址：http://hi.baidu.com/redareyou/blog/item/649fb9119cc0dfcba7ef3f1b.html
最后
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