How to Check Java Version

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It is very easy to find out the version of  java in use. It is also handy to understand whether a particular java installation is 32 bit or 64 bit

Step 1

Open a Command Prompt

Simultaneously click the (Windows Logo Key Button + R key) keyboard buttons and in the run box type cmd.

The same can also be done by  – Clicking the Windows Start menu and and in the search type cmd.

Step 2

Issue the Command

java – version 

in the command prompt

Java Version Check

It gives a lot of information about the java virtual machine. It is clear that the version is 1.7.0_21 and it is a HotSpot VM.

32 Bit or 64 bit Java

Method 1

The second part of the problem is to find out whether a particular JVM is 32bit or 64 bit.  When it is a 64 bit version, the java -version command will output something similar to

Java HotSpot(TM) 64-Bit Server VM

If there is no 64-Bit String getting printed, it is a 32 bit Java Installation.

Method 2

If you are programmer you can find the java version by printing

System.getProperty(“sun.arch.data.model”)

sun.arch.data.model=32 // 32 bit JVM
sun.arch.data.model=64 // 64 bit JVM

Method 3

Issue the command  java -d64

java64bit

If it is not a 64 bit Java installation you will get the above error message. This means it is a 32 bit installation.