Go to the How do I test whether Java is working on my computer? page. When the test runs, see what it shows for Architecture . Possible values are:
x86 - 32-bit
amd64 - 64-bit
Boulder Computer Maven
Microsoft Most Valuable Professional
Trying to install 32 bit java
How do I tell if I have Java 32 bit or 64 bit installed in Windows 7 Ultimate 64 bit?
java - JRE 32bit vs 64bit - Stack Overflow
Installing Java Runtime Environment 8 update 144 (32-bit) Available (JRE 8 32-bit version Installed) (x64) via BigFix
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Im trying to use this program that requires 32-bit java, but going to the download page automatically directs me to the 64-bit download page (which I already own, but do not need for this program), can anyone help?
edit: clarifying a couple questions and what happened, it said in the read me document for the program that it requires 32-bit java, I also was able to find a version of it that can use 64-bit java so no worries, thank you for all the help!
Go to the How do I test whether Java is working on my computer? page. When the test runs, see what it shows for Architecture . Possible values are:
x86 - 32-bit
amd64 - 64-bit
Boulder Computer Maven
Microsoft Most Valuable Professional
Thanks for the info. Much appreciated. The results are as follows:
Vendor: Sun Microsystems Inc.
Version: Java 6 Update 20
Operating System: Windows 7 6.1
Architecture: x86
How should I interpret this? Do I need the amd64 - 64 bit version as well? I need the capability of running older 32 bit programs along with ones designed for 64 bit. (please pardon my ignorance on this matter. I've been running XP for years but am a newbe at Windows 7)
Peace!
Download of Java 32-Bit-Version for Linux: https://www.java.com/en/download/linux_manual.jsp
After java 8 there is no more 32 bit Oracle virtual machine. I think the same is for OpenJDK. You can search if you want for another virtual machine which has 32 bit and after that install it.
For example I see that Azul has 32 bit machine. But honestly I never test them. Maybe there are other JVM providers with 32 bit machines: https://www.azul.com/downloads/zulu/zulu-linux/
By the way I also don't know what kind of licences they have.
Apart from that Ubuntu 18.10 by default try to install OpenJDK 11. If you are OK with java 8 you can search how to install java 8 32 bits.
Good luck!
64-bit vs. 32-bit really boils down to the size of object references, not the size of numbers.
In 32-bit mode, references are four bytes, allowing the JVM to uniquely address 2^32 bytes of memory. This is the reason 32-bit JVMs are limited to a maximum heap size of 4GB (in reality, the limit is smaller due to other JVM and OS overhead, and differs depending on the OS).
In 64-bit mode, references are (surprise) eight bytes, allowing the JVM to uniquely address 2^64 bytes of memory, which should be enough for anybody. JVM heap sizes (specified with -Xmx) in 64-bit mode can be huge.
But 64-bit mode comes with a cost: references are double the size, increasing memory consumption. This is why Oracle introduced "Compressed oops". With compressed oops enabled (which I believe is now the default), object references are shrunk to four bytes, with the caveat that the heap is limited to four billion objects (and 32GB Xmx). Compressed oops are not free: there is a small computational cost to achieve this big reduction in memory consumption.
As a personal preference, I always run the 64-bit JVM at home. The CPU is x64 capable, the OS is too, so I like the JVM to run in 64-bit mode as well.
As you note, primitive numeric types in Java are well-defined.
However, the choice between 32-bit and 64-bit JVMs can matter if your Java application is using native-code libraries, which may be built for use in a 32-bit application, a 64-bit application, or both.
If you have native libraries that support only 32-bit applications, you either need to use a 32-bit JVM, or build 64-bit versions of the libraries.