Java Virtual machine and compiler version inconsistency issues

Error code:

Exception in thread "main" Java.lang.UnsupportedClassVersionError:VarDemo:Uns
upported Major.minor version 51.0
At Java.lang.ClassLoader.defineClass1 (Native Method)
At Java.lang.ClassLoader.defineClassCond (Unknown Source)
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$000 (Unknown Source)
At Java.net.urlclassloader$1.run (Unknown Source)
At java.security.AccessController.doPrivileged (Native Method)
At Java.net.URLClassLoader.findClass (Unknown Source)
At Java.lang.ClassLoader.loadClass (Unknown Source)
At Sun.misc.launcher$appclassloader.loadclass (Unknown Source)
At Java.lang.ClassLoader.loadClass (Unknown Source)
Could not find the main class:vardemo. Program would exit.

Query statement:

Javac-version

Java-version

There is a problem with path within the system environment variable.

After modifying the

Code executes smoothly

Java Virtual machine and compiler version inconsistency issues