https://source.android.com/ 
public interface android.provider.ContactsContract$BaseSyncColumns
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.provider.ContactsContract$BaseSyncColumns
  super_class: java.lang.Object
{
  public static final java.lang.String SYNC1;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "sync1"

  public static final java.lang.String SYNC2;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "sync2"

  public static final java.lang.String SYNC3;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "sync3"

  public static final java.lang.String SYNC4;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "sync4"
}
SourceFile: "ContactsContract.java"
NestHost: android.provider.ContactsContract
InnerClasses:
  protected abstract BaseSyncColumns = android.provider.ContactsContract$BaseSyncColumns of android.provider.ContactsContract