Determine whether JDK is 64 bit or 32-bit

Sun has a Java System property to determine the bitness of the JVM: 32 or 64:

You can use


to determine if its 32/64 from the program.


When writing Java code, how do I distinguish between 32 and 64-bit operation?

There’s no public API that allows you to distinguish between 32 and 64-bit operation. Think of 64-bit as just another platform in the write once, run anywhere tradition. However, if you’d like to write code which is platform specific (shame on you), the system property has the value “32”, “64”, or “unknown”.

The only good reason is if your java code is dependent upon native libraries and your code needs to determine which version (32 or 64bit) to load on startup.

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