Regarding Java Version

presently there are many application programs developed using recent versions of java.how an end user in a network having old version of Java can be able to see the output? (perspective: different classes includ开发者_Python百科es in new version of Java)

For applications that have been developed using recent versions of Java, there's no solution other than having users upgrade their Java runtime to the minimum version required to run the applications.

Note that it is not only the classes in the standard Java library, but also the .class file format has changed in ways that are not backwards compatible with old Java runtimes.

If you develop an application that targets a specific JVM version / Java specification, then you will need to ensure that all future application updates remain backwards compatible with this JVM version / Java specification.

If you want are asking how to find out the version of Java you are currently running, you can execute the following on the command line:

$java -version

OK fine.. but is that the user should have java runtime environment in which it should support should all objects that were created with new versions which were not in old version.