C#笔记（1）
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class SalesPerson : Employee{ public override sealed void GiveBonus(float amout) { }}sealed Class PTSalesPerson : SalesPerson{ public override void GiveBonus(float amout)//error! { }}?
abstract class Shape{ public virtual void Draw() { ….. }}?
public abstract class Shape{ public abstract void Draw();//不提供实现}?
class Circle{ public void Draw() { …… }}//Errorclass ThreeDCircle : Circle{ public void Draw() { …… }}?
public new void Draw(){ …… }//注意ThreeDCircle o = new ThreeDCircle();o.Draw(); //子类((Circle)o).Draw(); //强制调用基类?
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