Example contract class for a table which contains data about the store's headphones stock

StoreContract.java

public final class StoreContract {

    public static abstract class HeadphoneEntry implements BaseColumns {
      
        public static final String TABLE_NAME = "headphones";
        public static final String COLUMN_NAME = "name";
        public static final String COLUMN_PRICE = "price";
        public static final String COLUMN_STYLE = "style";
        public static final String COLUMN_IN_STOCK = "in_stock";
        public static final String COLUMN_DESCRIPTION = "description";
    
        /**
         * Possible values for the style of the headphone.
         */
        public static final int STYLE_EAR_BUD = 0;
        public static final int STYLE_ON_EAR = 1;
        public static final int STYLE_OVER_EAR = 2;
        public static final int STYLE_BONE_CONDUCTION = 3;

    }
}

BlackJack baby !!

BaseColumns implemented ? What is it : an interface, an abstract class, something else ?

I was wondering about the same thing. I found that it's an interface (see its code below) that has no methods. It just has two public constants: _ID and _COUNT.

==================================

  | * Copyright (C) 2006 The Android Open Source Project
  | *
  | * Licensed under the Apache License, Version 2.0 (the "License");
  | * you may not use this file except in compliance with the License.
  | * You may obtain a copy of the License at
  | *
  | * http://www.apache.org/licenses/LICENSE-2.0
  | *
  | * Unless required by applicable law or agreed to in writing, software
  | * distributed under the License is distributed on an "AS IS" BASIS,
  | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  | * See the License for the specific language governing permissions and
  | * limitations under the License.
  | */
package android.provider;

  public interface BaseColumns {
  /**
  * The unique ID for a row.
  *

Type: INTEGER (long)

  /
  public static final String _ID = "_id";
 
  /*
  * The count of rows in a directory.
  *

Type: INTEGER

  */
  public static final String _COUNT = "_count";
  }

==================================

24th to comment on 24th of May :)) Niceee

25th comment! 👍

26th and I'm going to be 26 this month! Niiice =)

xd...

28th comment

29 💃

30 is a nice number!!

31

well, well, 32... how are you??? ;)

33 yes yes

I don't see any point in posting comment rank,,, I'm 34th btw ;)

35th person

incase if you curious ...i'm 36th person

I am 37.... and I owns a McLaren ! :P

First in 2020
My name is Mr. 38.

wouw 87

i love udacity

me 41 comment

"You are my forty years old son who still lives with me."
"FORTY TWO. I AM FORTY TWO YEARS OLD."

52 c

comment date/2

54th comment 😁😂

55th #first in 2021

56th comment

57 ☜(ﾟヮﾟ☜)

58th comment

59