Q : What is an abstract class?

什么是一个抽象类?

Shape is an abstract class.

Shape 是一个抽象类。

What is the difference between an Interface and an Abstract class?

接口与抽象类间的区别?

Derived classes of the abstract class must implement all abstract methods.

抽象类的派生类必须实现所有抽象方法.

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。

The basic idea how to solve this task is to have an abstract class

解决这个问题的基本想法是有一个抽象类

The basic idea how to solve this task is to have an abstract class.

解决这个问题的基本想法是有一个抽象类.

Having an abstract method prevents a class from being instantiated, thus making it a de-facto abstract class.

有一个抽象方法防止类实例化，因此阿德事实上的抽象类。

How to define members of a sealed abstract class in a nice way?

如何在一个很好的方式定义一个密封的抽象类的成员？

This abstract class is the superclass of all classes representing an output stream of bytes.

该抽象类是所有表示字节输出流的类的父类.