Question 1. The components of a class are called _____ and _____.
elements; objects
attributes; methods
objects; instantiations
properties; descriptions
Question 2. Which of the following would be the most appropriate choice for a method in a Cup class?
drink()
hot()
break()
color()
Question 3. Which of the following statements is/are true?
A. Objects communicate through message passing.
B. An object must be defined before you can create a class.
C. The state of an object should not be hidden.
D. Implementation details should be visible through the interface of a class.
A and C
All are true
None are true
Question 4. Which of the following would be the most appropriate choice for a data member in a Screen class?
dimensions
turnOff
refresh
activate Screen Saver
Question 5. The property of _____ describes the packaging of state and behavior together in an object.
data hiding
abstraction
encapsulation
All of the above
None of the above
Question 6. Most professional coding standards use _____ for class names.
underscores along with all upper case words
Method Class case
no specific naming convention
Pascal case
Question 7. Examine the ClockType class definition. How many attributes does it contain?
class ClockType
{
public void setTime(int hour, int min, int sec);
public int getTime();
public void printTime();
private int hr;
public int min;
public int sec;
}
2
3
9
6
An average of 5 because (7+3)/2 = 5
Question 8. Assume we have two classes and have instantiated an object from each class. How many copies of each class's attributes and methods exist in the instantiated objects?
Two copies, one copy of the first class and one of the second
Zero, the objects do not have attributes and methods
Only one copy and both objects share it
None of the above
Question 9. Both _____ and _____ allow for code reuse and the building of more complex systems.
inheritance; composition
UML diagrams; serialization
messaging; object behaviors
None of the above
Question 10. Which of the following is a valid statement for a method definition in Java?
public int computeAverage {
return 1;
}
public int computeAverage (
return 1;
)
public int computeAverage () {
return 1;
};
public int computeAverage () {
return 1;
}