Java Code:
import java.util.*;

enum OperatingSystems {
    windows, unix, linux, macintosh
}

public class EnumExample1 {
    public static void main(String args[])
    {
        OperatingSystems os;

        os = OperatingSystems.windows;
        switch(os) {
            case windows:
                System.out.println("You chose Windows!");
                break;
            case unix:
                System.out.println("You chose Unix!");
                break;
            case linux:
                System.out.println("You chose Linux!");
                break;
            case macintosh:
                System.out.println("You chose Macintosh!");
                break;
            default:
                System.out.println("I don't know your OS.");
                break;
        }
    }
}