Question

I am trying to call native executables from java program. I have three exe files one for win32, other linux 32-bint and third linux 64-bit, now before I can call the right executable I need to determine which platform program is running on. I can determind Operating system by simply getting “os.name” System property, but not sure how to get determine if it is 32-bit or 64-bit platform?

Answer 1

Here are some relevant System properties with the values on my machine:

os.arch:                 x86
os.name:                 Windows Vista
sun.arch.data.model:     32

From this information, you should be able to guess something like this:

String osName     = System.getProperty("os.name").toLowerString();
String dataModel  = System.getProperty("sun.arch.data.model");

boolean isWindows = osName.startsWith("windows");
boolean isLinux   = osName.startsWith("linux"); // or whatever
boolean is32bit   = "32".equals(dataModel);
boolean is64bit   = "64".equals(dataModel);

if(isWindows && is32bit){
    call32BitWindowsLib();
}

//etc.

For a completer reference, see:

• System.getProperties()
• When writing Java code, how do I distinguish between 32 and 64-bit operation?
• How can I tell if I’m running in 64-bit JVM or 32-bit JVM?