//抽象類別
abstract class AbsClass
{
    public void pubMethod() { }
    public virtual void virMethod() { }     //virtual： 虛擬方法
    public abstract void abcMethod();       //abstract： 抽象方法 -> 只能定義,不能有內容
}
 
//一般類別
class GenClass
{
    public void pubMethod() { }
    public virtual void virMethod() { }
    //public abstract void abcMethod();     //抽象方法只能在抽象類別中定義
}
 
//繼承一般類別
class MyClass1 : GenClass
{
    //1. 在繼承一般類別時，一般的方法不可以被覆寫
    //public override void pubMethod()｛ ｝
 
    //2. 但是，可以用 new 修飾詞來隱藏父類別中的這個方法，
    public new void pubMethod()｛ ｝
 
    //3. 父類別中的虛擬方法才可以被覆寫
    public override void virMethod()｛ ｝
}
 
//繼承抽象類別
class MyClass2 : AbsClass
{
    //4. 繼承抽象類別, 就一定要實作它的抽象方法, 同樣是以覆寫的方式來做.
    public override void abcMethod() { }
}

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