java - Read static field of interface via reflection -

i've got interface:

public interface interface { public static final string field1 = "bar"; public static final string field2 = "foo"; ......... } 

i'm trying read field name via reflection using code:

    field[] fields = interface.class.getfields();     (field f : fields) {           ............     } 

the problem array has length zero. why?

edit: i'm using proguard , think problem related interface obfuscation.

i running same code have provided , able print name of fields interface.

import java.lang.reflect.field;  public class prop {   public static void main(string[] args)   {     field[] fields = interface.class.getfields();     (field f : fields) {       system.out.println(f.getname());     }   } }  interface interface {   public static final string field1 = "bar";   public static final string field2 = "foo"; } 

ouput:

field1   field2