https://source.android.com/ 
public interface android.provider.CalendarContract$EventDaysColumns
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.provider.CalendarContract$EventDaysColumns
  super_class: java.lang.Object
{
  public static final java.lang.String STARTDAY;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "startDay"

  public static final java.lang.String ENDDAY;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "endDay"
}
SourceFile: "CalendarContract.java"
NestHost: android.provider.CalendarContract
InnerClasses:
  protected abstract EventDaysColumns = android.provider.CalendarContract$EventDaysColumns of android.provider.CalendarContract