问题
In java, is an int guaranteed to always be of 32bit size and a long of 64bit size regardless of whether the architecture is 32 or 64 bit?
回答1:
Java is platform independent. So int is 32-bits, and long is 64-bit.
回答2:
The Java Tutorial page on primitive data types specifies the fixed sizes and makes no mention of underlying architecture having any influence
int: The int data type is a 32-bit signed two's complement integer. It has a minimum value of -2,147,483,648 and a maximum value of 2,147,483,647 (inclusive).
long: The long data type is a 64-bit signed two's complement integer. It has a minimum value of -9,223,372,036,854,775,808 and a maximum value of 9,223,372,036,854,775,807 (inclusive). Use this data type when you need a range of values wider than those provided by int.
回答3:
int in Java is always 32-bit. No matter the OS type/architecture/whatever.
来源：https://stackoverflow.com/questions/18017752/will-an-int-be-32bit-and-a-long-64bit-regardless-of-whether-the-system-is-32-or