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"Users should download 64-bit Java software, if they are running 64-bit IE. For downloading 64-bit Java click 64-bit manual download " The only off-line installer, as far as I can tell, has only installed the 32-bit runtime.
Java SE Development Kit 8u112 on a 64-bit Windows 7 or Windows 8 Set the following user environment variables (== environment variables of type user variables ) JAVA_HOME : C:\Program Files\Java\jdk1.8.0_112
Theoretically 2 64, but there might be limitations (obviously) According to this FAQ it's only limited by memory and swap space on the local system:On 64-bit VMs, you have 64 bits of addressability to work with resulting in a maximum Java heap size limited only by the amount of physical memory and swap space your system provides.
A 32 bit version will return something about a "Client VM" or "Server VM", and a 64 bit version will state so explicitly. E.g., the output of my machine (admittedly, a Fedora 25, but the principle should stand): openjdk version "1.8.0_121" OpenJDK Runtime Environment (build 1.8.0_121-b14) OpenJDK 64-Bit Server VM (build 25.121-b14, mixed mode)
If it is not Oracle's Java, you may not be able to tell. When I install Oracle Java 64-bit, the files go into C:\Program Files\Java, but when I install a 32-bit version, they default to C:\Program Files (x86)\Java instead. Of course, the person who installed Java could have overridden those defaults.
I have removed JAVA_HOME variable, and removed 32-bit and 64-bit paths from path variable, then restarted CMD, but still CMD able to execute java -version command, and shows 64-bit. I doubt java may set registry settings for path, and I dont know how to update that :(–
If your application throws the exception below (On Windows 7 64 bit, with JVM 64) Exception in thread "main" java.lang.UnsatisfiedLinkError: Cannot load 32-bit SW T libraries on 64-bit JVM. Then the solution is as follows: On 64-bit JVM's you need the 64-bit SWT. Current versions can be downloaded as described below - pretty well hidden:
Java JRE 64-bit download for Windows? 1. Install a 32-bit JRE on Windows 64-bit platform. 0. Installing 64 ...
On most CPU architecures 32-bits is faster than 64-bit, all else being equal. 64-bit pointers require twice as much bandwidth to transfer as 32-bits. However, the x64 instruction set architecture adds a bit of sanity over x86, so it ends up being faster. The amount of handling of long types is usually small.
If you want to use 32-bit references, your heap is limited to 32 GB. However, if you are willing to use 64-bit references, the size is likely to be limited by your OS, just as it is with 32-bit JVM. e.g. on Windows 32-bit this is 1.2 to 1.5 GB.