C#中new关键字的用法及理解
new public void Show()中的new是隐藏基类Show作用。在子类Show中写一个和基类Show一样名字的非虚方法,会让基类中的函数被隐藏,编译后会提示要求使用New关键字来显示的隐藏基类的方法。C#中new关键字的用法1.new 运算符 用于创建对象和调用构造函数。 2.new 修饰符 用于隐藏基类成员的继承成员。 3.new 约束 用于在泛型声明中约束可能用作类型参数的参数的类型。扩展资料1.方法的重载重载：指的是同一个类中有两个或多个名字相同但是参数不同的方法，(注:返回值不能区别函数是否重载)，重载没有关键字。作用：允许你以相同的名称不同的参数来调用多个方法2.方法的重写重写：是指子类对父类中虚函数或抽象函数的“覆盖”。特点：(1)重写的父类中的方法必须用 virtual、abstract 或 override 修饰，且不能重写非虚方法或静态方法。 (2)override的方法和virtual的方法必须具有相同的访问级别修饰符。3.方法的隐藏(New)隐藏：在子类中写一个和基类一样名字(参数不同也算)的非虚方法,会让基类中的函数被隐藏,编译后会提示要求使用New关键字来显示的隐藏基类的方法。参考资料https://baike.baidu.com/item/重载网页链接
外语学习 英语考试
1. They came to China in 1990.(变一般疑问句)
Did they come to China in 1990?
2. I was ill for two days last week? (同上)
were you ill for two days last week?
3. The twins go to school on foot every day. (同上)
DO the twins go to school on foot every day?
4. She washed the clothes last Sunday. ( 变否定句)
She didn't wash the clothes last Sunday.
5. She is going to shopping tomorrow. (变否定句)
She isn't going to shopping tomorrow.
6. My mother likes her students. (变一般疑问句)
Does My mother like her students?_________________________________
7. Do you watch TV on Sunday? (用last Sunday 改写成过去时态的句子)
Did you watch TV on Sunday?
8. Wei Hua bought a new pen yesterday. (变否定句)
She diidn't buy a new pen yesterday.
9. We had a meeting the day before yesterday. (变一般疑问句)
Did you have a meeting the day before yesterday?
10. They had a good time last Sunday.
Did the twins have a good time?
