Java backward compatibility description

I have a Java class file I compiled with JVM 7 I implemented Java 1.7 additions, such as string switchcase and diamond operator Now I want to run this on Java 1.6 JRE Class file Will it work?

A simple program using string switch, I'm uninstalling 6 Please try and give me the answer

import java.util.Scanner;


  public class Classing 
 {

public static void main(String[] args) 
{


    System.out.println("Enter a month to kNow who you are");
    System.out.println("Jan \n Feb \n Mar \n Apr");

    Scanner scan=new Scanner(system.in);

    String name=scan.nextLine();

    System.out.println(fortune(name.toLowerCase()));

}

public static String fortune(String s)
{


    switch(s)
    {

    case "jan":

        return "Good guy";

   case "feb":

        return "Nice guy";

   case "mar":

      return "Brave guy";

      case "apr":

      return "Super guy";


    }

    return " Month out of option"+s;
}

}

Solution

According to http://www.oracle.com/technetwork/java/javase/compatibility-417013.html#binary , even if there is a recognized answer to this question