本文详细阐述了Java中抽象类与接口之间的主要区别，包括抽象类可以包含部分实现而接口不能，抽象类可以定义构造器及变量，而接口中的变量默认为final等。此外还介绍了Java类可以继承一个抽象类但只能实现多个接口的特点。
1. An abstract class is a class that is only partially implemented. It may contain none
or multiple abstract methods. An abstract method is simply a function definition that must be implemented in a child class.
2. An interface is a fully abstract class; none of its methods are implemented.
3. Variables declared in a Java interface is by default final. An abstract class may contain non-final variables.
4. An abstract class can have a constructor.
5. Members of a Java interface are public by default. A Java abstract class can have the usual flavors of class members like
private, protected, etc..
6. A Java class can implement multiple interfaces but it can extend only one abstract class.
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