Java Basics - OO

Question 1

Multiple inheritance of type:

Multiple inheritance of state:

Answer 1

• Multiple inheritance of type includes the ability to implement multiple interfaces and/or ability to extend from multiple classes.
• Multiple inheritance of state includes the ability to inherit instance fields from multiple classes

Interfaces, classes, and enums are all "types". Java allows a class to implement multiple interfaces. In this way, Java supports multiple inheritance of types. 
"State", on the other hand, is represented by instance fields. Only a class can have instance fields and therefore, only a class can have a state. (Fields defined in an interface are always implicitly static, even if you don't specify the keyword static explicitly. Therefore, an interface does not have any state.) Since a class is allowed to extend only from one class at the most, it can inherit only one state. Thus, Java does not support multiple inheritance of state.