Abstract methods used when one method can implement in more than one sub class with different implementation.
抽象方法时使用一个方法可以实现在多个接头与不同的实现类。
Any class with an abstract method is automatically abstract itself, and must be declared as such. A class may be declared abstract even if it has no abstract methods.
任一类以一个抽象方法自动地是抽象的本身，且必须被声明，一个类可以被声明是抽象的既使它没有抽象方法。
If you have an abstract class (any class with an abstract method becomes an abstract class), you can not create an object of that class.
如果你有一个抽象类(任何类的抽象方法成为一个抽象类)，您不能创建该类的一个对象。
When an abstract class inherits a virtual method from a base class, the abstract class can override the virtual method with an abstract method.
当抽象类从基类继承虚方法时，抽象类可以使用抽象方法重写该虚方法。
Not really dealt with abstract methods that much but am looking at an abstract method inside an abstract class.
不涉及抽象方法，但我看在一个抽象类抽象方法。
Not really dealt with abstract methods that much but am looking at an abstract method inside an abstract class.
不涉及抽象方法，但我看在一个抽象类抽象方法。
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