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It is always long 64-bit on both 32 and 64-bit machines

I am wondering how long is 64 bit in x86 and x64?

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3 answers

Yes. Java long is 64 bits on any JVM without exception. All primitive Java types are fully portable and have fixed sizes in all implementations.

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Yes. A long is known as a 64-bit integer.

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Primitive types are always the same size. Only links can vary in size, but you don’t need to know this at all.

You can get the size of the link with

 int addressSize = Unsafe.addressSize();

Note. Even in a 64-bit JVM (on the latest Java 6+ JVMs), the links are 32-bit, but if you are not using a bunch of 32 GB or more. This is the default value for OpenJDK / Sun / Oracle JDK, however, as @ user988052 notes, the IBM JVM needs the appropriate flag to be set on the command line. Other JVMs may not support this option at all.

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Source: https://habr.com/ru/post/905319/

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