Exam 10: Object-Oriented Programming: Polymorphism

Consider classes A, B and C, where A is an abstract superclass, B is a concrete class that inherits from A and C is a concrete class that inherits from B. Class A declares abstract method originalMethod, implemented in class B. Which of the following statements is true of class C?

A class that implements an interface but does not declare all of the interface's methods must be declared ________.

Non-abstract classes are called ________.

Which of the following does not complete the sentence correctly? An interface .

Which statement best describes the relationship between superclass and subclass types?

Which of the following statements is false?

Which of the following could be used to declare abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments)?

Which of the following is not possible?

Declaring a method final means:

For which of the following would polymorphism not provide a clean solution?

Polymorphism allows for specifics to be dealt with during:

The UML distinguishes an interface from other classes by placing the word "interface" in above the interface name.

Which of the following statements about abstract superclasses is true?

Consider the abstract superclass below: Public abstract class Foo { Private int a; Public int b; Public Foo(int aVal, int bVal) { A = aVal; B = bVal; } Public abstract int calculate(); } Any concrete subclass that extends class Foo:

Interfaces can have methods.

Which keyword is used to specify that a class will define the methods of an interface?

When a superclass variable refers to a subclass object and a method is called on that object, the proper implementation is determined at execution time. What is the process of determining the correct method to call?

If the superclass contains only abstract method declarations, the superclass is used for ________.

Assigning a subclass reference to a superclass variable is safe ________.

It is a UML convention to denote the name of an abstract class in ________.