抽象和信息隐藏

Question

抽象意味着隐藏“实现细节” .....所以抽象的目标是实现信息隐藏？ 如果没有实现细节，信息隐藏中隐藏了什么？ 信息隐藏技术是如何抽象的？

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

/* Example of Abstratcion: An application for mobile manufacturing company - Every phone must have to implement caller 
 * and sms feature but it depends on company to company (or model to model) if they want to include other features or not 
 * which are readily available , you just have to use it without knowing its implementation (like facebook in this example).
 */
namespace AbstractTest
{
    public abstract class feature
    {
        public abstract void Caller();
        public abstract void SMS();
        public void facebook()
        {
            Console.WriteLine("You are using facebook");
        }
    }    
    public class Iphone : feature    
    {
        public override void Caller()
        {
            Console.WriteLine("iPhone caller feature");
        }
        public override void SMS()
        {
            Console.WriteLine("iPhone sms feature");
        }
        public void otherFeature()
        {
            facebook();
        }
    }
    public class Nokia : feature
    {
        public override void Caller()
        {
            Console.WriteLine("Nokia caller feature");
        }
        public override void SMS()
        {
            Console.WriteLine("Nokia sms feature");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Iphone c1 = new Iphone();
            c1.Caller();
            c1.SMS();
            c1.otherFeature();
            Nokia n1 = new Nokia();
            n1.Caller();
            n1.SMS();
            Console.ReadLine();
        }
    }
}

Answer 2

抽象的目的不是在变量值的意义上隐藏信息，而是封装。

抽象的唯一目的是允许程序员在不了解算法或概念的情况下使用它。 信息隐藏可能是这种情况的副产品，但这不是其目标。