How to run jar in window while in Ubuntu it's working fine?

I am stuck on this error I don't know what type of error is this what should I do:

C:\Users\shehzad\Desktop\Software>java -jar Untitled.jar Exception in thread "main" java.lang.UnsupportedClassVersionError: FrontEnd/MainWindow : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56)

Scenario is : I developed a software that is working fine on Ubuntu 14.04 Lts. It's jar also working but when I tried this jar on Window 7 it shows above error.

On Ubuntu java version: 1.8.0_101

On window java version is: 1.7.0_79