CODEWITHSUNDEEP
java64-bitjava-native-interface
Saar
Saar

Reputation: 1803

Java, 64-bit, JNI - compared to .NET CLR

The .NET assembly PE header has a target platform for 32-bit / 64-bit which is used when the assembly use native interop like P/Invoke (otherwise it would be Target=AnyCPU).

Is there any equivalent for Java when the Java application has an interface to some native interface through JNI? The JNI has to be either compiled for 32-bit or 64-bit.

Is there an article explaining Java 64-bit architecture and development? I wasn't able to find one.

Upvotes: 1

Views: 447

Answers (2)

user383320
user383320

Reputation: 11

You can detect 64-bit by using:

public static final boolean is64bit = (System.getProperty("sun.arch.data.model").indexOf("64") != -1)

You can also start Java in 32 or 64-bit by using -d32 or -d64.

If this for a web or desktop application there may be a way of specifying it from the manifest file.

Upvotes: 1

Jesper
Jesper

Reputation: 206786

You can look at the system property os.arch:

String osArch = System.getProperty("os.arch");

Unfortunately the possible values for this property are not documented, but you might try it out on different systems to see what it returns (using Sun JDK 6 update 20 on my 64-bit system it returns amd64).

See the API documentation of java.lang.System.getProperties() for other available system properties.

Upvotes: 0

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