java - How to have a parameter that is one of several enum types in a class -

i have class has several enums representing names of different types of devices.

public class devicenames {     public enum microsoft {         devicename1, devicename2, devicename3     }      public enum apple {         devicename1, devicename2, devicename3     } } 

i have interfaces different concrete devices implement (the interface specifies ways can communicate)

public interface ipdevice{     //factory method     device createnewipdevice(devicenames.enum<e> devicename); }  public interface usbdevice{     //factory method     device createnewusbdevice(devicenames.enum<e> devicename); } 

and have abstract class

public abstract class device {     string devicename;      protected device(string devicename) {         this.devicename = devicename;     } } 

and concrete implementations of abstract class implement 1 or more of interfaces

public class microsoftdevice implements ipdevice{     @override     public device createnewipdevice(devicenames.microsoft devicename) {         return super(devicename.tostring());     } }  public class appledevice implements ipdevice, usbdevice {     @override     public device createnewipdevice(devicenames.apple devicename) {         return super(devicename.tostring());     }      @override     public device createnewusbdevice(devicenames.apple devicename) {         return super(devicename.tostring();     } } 

i want use enum ensure give valid device names (instead of them passing in string)

how can have interface method take parameter can take generic enum type enum in devicenames class?

i asked follow question here. accepted answer solved question.

to quote @andreas (the 1 answered other question)

you make interface take generic parameter

the working code looks (the code not included here stays same):

public interface ipdevice<devicename extends enum> {     //factory method     device createnewipdevice(devicename devicename); }  public interface usbdevice<devicename extends enum> {     //factory method     device createnewusbdevice(devicename devicename); }  public class microsoftdevice implements ipdevice<devicenames.microsoft> {     @override     public device createnewipdevice(devicenames.microsoft devicename) {         return super(devicename.tostring());     } }  public class appledevice implements ipdevice<devicenames.apple>, usbdevice<devicenames.apple> {     @override     public device createnewipdevice(devicenames.apple devicename) {         return super(devicename.tostring());     }      @override     public device createnewusbdevice(devicenames.apple devicename) {         return super(devicename.tostring();     } }