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How to check jre version and 32 or 64 bit in windows?
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Command to Check JRE Version 
java -version

command to test version and 32 bit or 64 bit java is installed.
Example 
D:\>java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)

D:\>
-showversion and -version:<version> options 
java -showversion is the alias option for the -version. Manual version can specify to run the java program. Can use -version:<1.0> to run the java file as version 1.0 java program.
Example to run with specific version 
java:javac Example.java

java:java -version:1.4 Example
Error: Unable to locate JRE meeting specification "1.4"

java:java -version:1.5 Example
Error: Unable to locate JRE meeting specification "1.5"

java:java -version:1.6 Example
Error: Unable to locate JRE meeting specification "1.6"

java:java -version:1.0 Example
Error: Unable to locate JRE meeting specification "1.0"

java:java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)

java:java -version:1.7 Example
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