C# 封装与继承的概念与区别

public class BankAccount
{
    private decimal _balance; // 私有字段，外部无法直接访问
    // 公开方法提供受控访问
    public void Deposit(decimal amount)
    {
        if (amount > 0)
            _balance += amount;
    }
    public decimal GetBalance() => _balance;
}

public class Animal // 基类
{
    public void Eat() => Console.WriteLine("Eating...");
}
public class Dog : Animal // 派生类
{
    public void Bark() => Console.WriteLine("Woof!");
}

public class Vehicle // 父类
{
    protected int _speed; // 受保护字段（封装）
    public virtual void Move() => Console.WriteLine("Moving");
}
public class Car : Vehicle // 子类（继承）
{
    private string _model; // 私有字段（封装）
    public Car(string model) => _model = model;
    public override void Move() 
    {
        _speed = 60; // 访问继承的受保护字段
        Console.WriteLine($"{_model} driving at {_speed}km/h");
    }
}