we run java program in cmd using java , same way for finding installed java version we use Java -version in cmd, So how does it gives us version details? Is there any Version class defined in java API ?Its seems funny Question though
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4No, it's not in the API. It's just printing values baked into the `java` binary when it was compiled. – Andy Turner Nov 17 '16 at 09:25
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1Related: [Getting version of java in runtime](http://stackoverflow.com/q/2591083/3788176). – Andy Turner Nov 17 '16 at 09:26
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See this answer: http://stackoverflow.com/a/13851817/4491066 – Adam Nov 17 '16 at 09:28
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Use
System.getProperty("java.vendor")
System.getProperty("java.version")
System.getProperty("java.vm.vendor")
System.getProperty("java.vm.name")
System.getProperty("java.vm.version")
System.getProperty("os.name")
System.getProperty("os.version")
System.getProperty("os.arch")
And for getting the default character encoding
new java.io.OutputStreamWriter(new java.io.ByteArrayOutputStream()).getEncoding()
Serg M Ten
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1Even the default character encoding may be got from the standard System Property "file.encoding". – Little Santi Nov 17 '16 at 23:20
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Java stores the version into the java.exe. In case you want to try for yourself just open the java.exe into any text editor or hex editor and you will find version written inside it.
Akshay Chordiya
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