Lab 2
– Simple Class
Post
Test
Knowledge/Memory
1. What
attributes do all real world objects have?
a. Existence
b. State
and behavior
c. Size
and weight
d. Identity,
state, and behavior
Answer: d
2. To
instruct a class or an object to perform a task, you need to:
a. Send
a method to it.
b. Send
a message to it.
c. Send
an instance to it.
d. Send
a state to it.
Answer: b
3. Which
of the following declarations is the general scheme for a class definition?
a. class ClassName{
// Description of the instance variables.
// Description of the constructors.
// Description of the methods.
}
b. class
ClassName{
// Description of the methods.
// Description of the constructors.
// Description of the instance variables.
}
c. ClassName{
// Description of the instance variables.
// Description of the constructors.
// Description of the methods.
}
d. class ClassName{
public static void main ( String[] args )
{ // entire program goes here
}
}
Answer: a
4. When
you run a Java application by typing java someClass, what is the first
method that starts?
a. The run() method of someClass
b. The
main() method of someClass
c. The someClass method
d.
None of the above
Answer: b
5. What
is another name for creating an object?
a. inheritance
b. insubordination
c. initialization
d. instantiation
Answer: d
Comprehension:
6. What
is the relationship between an object and a class?
a. An
object and a class are the same thing.
b. A
class is an instance of an object.
c. An
object is an instance of a class.
d. An
object is a template for a class.
Answer: c
7. Which
of the following statements best describes inheritance?
a. Inheritance
is the process of creating a new object.
b. Inheritance
is used to organize a program for maintainability.
c. Inheritance
is used when you need to create many objects of the same type.
d. Inheritance
is used to design two or more entities that are different but share many common
features.
Answer: d
8. How
many objects of a given class may be constructed in an application?
a. As
many objects as needed by the application
b. One
object per application
c. One
object per constructor
d. One
object per class
Answer: a
9. Which of the following names do not make a good class
name?
I.
Employee
II. Uncle John
III. Eat
IV. Student
a. I & II
b. II & III
c. I & IV
d.
III & IV
Answer: b
Application
10. In the code
listed below, identify the class constructor.
public
class House {
private
double price;
public
House(){
price = 0.0;
}
public
newHouse(){
price = 0.0;
}
public
void setPrice(double newPrice){
price=newprice;
}
public double getPrice(){
return price;
}
}
a.
public
void setPrice(double newPrice)
b.
public
double getPrice()
c.
public
House()
d.
public
newHouse()
Answer:
c