Java Programming Chapter 13 Abstract Classes and Interfaces Questions and Answers Graded A+

Java Programming Chapter 13 Abstract
Classes and Interfaces Questions and
Answers Graded A+
An abstract class in Java can have both abstract and concrete methods.


✔✔True




An interface in Java can have default and static methods.


✔✔True




An abstract class can be instantiated directly.


✔✔False




A class that implements an interface must provide implementations for all its methods unless

declared abstract.


✔✔True




A Java interface can extend multiple interfaces.


✔✔True


1

,A class can extend multiple abstract classes in Java.


✔✔False




A method in an interface is public by default.


✔✔True




A method in an abstract class can be private.


✔✔True




A static method can be declared inside an interface.


✔✔True




A final method can be overridden in an abstract class.


✔✔False




An interface in Java can have instance variables.


✔✔False

2

, A class implementing multiple interfaces must override methods from all interfaces.


✔✔True




A constructor can be defined inside an interface.


✔✔False




An abstract class can have instance variables.


✔✔True




Interfaces support multiple inheritance in Java.


✔✔True




A default method in an interface must be overridden by an implementing class.


✔✔False




An interface can extend an abstract class.


✔✔False

3