Deck 4: More Object Concepts

Question 1

When you write your own constructors, you cannot write versions that receive parameters.

Answer 1

False

Question 2

You can use the keyword final with methods or classes.

Answer 2

True

Question 3

If you give the same name to a class's instance field and to a local method variable, the instance variable overrides the method's local variable.

Answer 3

False

Question 4

As long as you do not make any ambiguous method calls, a program that contains a potentially ambiguous situation will execute correctly.

Question 5

Object-oriented programmers use the term ____ when a child class contains a field or method that has the same name as one in the parent class.

A) out of scope
B) ambiguous
C) override
D) parent friendly

Question 6

A block can exist entirely within another block or entirely outside and separate from another block, and sometimes blocks can overlap.

Question 7

A locally declared variable always ____ another variable with the same name elsewhere in the class.

A) creates
B) masks
C) deletes
D) uses

Question 8

If an integer is passed to a method with a double parameter, the double is promoted to an integer.

Question 9

It is illegal to declare the same variable name more than once within a block.

Question 10

It is a convenience to be able to use one reasonable name for ____ that are functionally identical except for argument types.

A) arguments
B) classes
C) tasks
D) packages

Question 11

A disadvantage of Java is the large memory requirements to store a separate copy of each variable and method for each instantiation of a class.

Question 12

When you properly ____ a method, you can call it providing different argument lists, and the appropriate version of the method executes.

A) declare
B) overload
C) name
D) delete

Question 13

Within any class or method, the code between a pair of curly braces is called a(n) ____.

A) overload
B) argument
C) scope
D) block

Question 14

____ involves using one term to indicate diverse meanings, or writing multiple methods with the same name but with different parameter lists.

A) Referencing
B) Overloading
C) Nesting
D) Signing

Question 15

When they have the same name, variables within ____ of a class override the class's fields.

A) packages
B) statements
C) fields
D) methods

Question 16

A variable comes into existence, or ____, when you declare it.

A) goes out of scope
B) comes into scope
C) overrides scope
D) is referenced

Question 17

An alternative to importing a class is to import an entire package of classes.

Question 18

When an application contains just one version of a method, you can call the method using a(n) ____ of the correct data type.

A) parameter
B) scope
C) output
D) constructor

Question 19

A method can receive ____ arguments, even if it is defined as needing double arguments.

A) string
B) integer
C) constructor
D) send

Question 20

When you overload a Java method, you write multiple methods with a shared name.

Question 21

It is not necessary to create an instance of the Math class because the constants and methods of the class are ____.

A) void
B) final
C) static
D) public

Question 22

When calling this() from a constructor, it must be the ____ statement within the constructor.

A) first
B) ending
C) second
D) indented

Question 23

When you instantiate an object from a class, ____ is reserved for each instance field in the class.

A) a constructor
B) a signature
C) memory
D) a field name

Question 24

____ variables are variables that are shared by every instantiation of a class.

A) Integer
B) Instance
C) Class
D) Time

Question 25

If a class's only constructor requires an argument, you must provide an argument for every ____ of the class that you create.

A) parameter
B) type
C) object
D) method

Question 26

When you ____________________ methods, you risk creating an ambiguous situation-one in which the compiler cannot determine which method to use.

Question 27

Another name for a nonstatic member class is a(n) ____.

A) static member class
B) inner class
C) local class
D) anonymous class

Question 28

When an object of one class is a data field within another class, they are related by ____.

A) extension
B) scope
C) composition
D) is-a

Question 29

You can use the asterisk (*) as a ____, which indicates that it can be replaced by any set of characters.

A) magic number
B) wildcard symbol
C) character symbol
D) placeholder

Question 30

You can use ____ arguments to initialize field values, but you can also use arguments for any other purpose.

A) object
B) constructor
C) data
D) field

Question 31

The compiler determines which version of a method to call by the method's ____.

A) name
B) signature
C) output
D) constructor

Question 32

In a Java ____________________ statement, you use a wildcard symbol to represent all the classes in a package.

Question 33

The keyword ____ indicates that a field value is unalterable.

A) end
B) final
C) permanent
D) static

Question 34

A(n) ____________________ begins immediately after the method declaration and ends at the end of the method.

Question 35

A(n) ____________________ is simply a folder that provides a convenient grouping for classes.

Question 36

Due to automatic type promotion, when a method with a double parameter is passed an integer, the integer will be promoted to a(n) ____.

A) integer
B) short
C) boolean
D) double

Question 37

The ____ statement notifies the program that you will be using the data and method names that are part of the imported class or package.

A) use
B) package
C) class
D) import

Question 38

The reference to an object that is passed to any object's nonstatic class method is called the ____.

A) magic number
B) this reference
C) literal constant
D) reference

Question 39

The ____ package contains frequently used classes and is implicitly imported into Java programs.

A) javax.swing
B) java.lang
C) JOptionPane
D) System

Question 40

When you pass a(n) ____________________, you pass a memory address.

Question 41

int aMethod(int x)
void aMethod(int x)
In the above statements, explain why these two methods are illegal in the class.

Question 42

Describe the impact that blocks and methods have on variables with the same name.

Question 43

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
Useful when working with dates and times

Question 44

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
Variables associated with individual objects

Question 45

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
An illegal action

Question 46

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
Defines mathematical constants such as PI

Question 47

What are the four types of nested classes?

Question 48

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
No object associated with them

Question 49

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
Created using the keyword final

Question 50

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
A variable comes into existence

Question 51

Describe and provide an example of overloading.

Question 52

Using an example, explain how nested blocks are created.

Question 53

What does a programmer need to know in order to use two variables with the same name in a class?

Question 54

What is a reference and what is the meaning of the keyword this?

Question 55

What is the difference between class variables and instance variables?

Question 56

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
Using one term to indicate diverse meanings

Question 57

Describe how a programmer can make a variable in or out of scope.

Question 58

Match each term with the correct statement below.
a.optional classes
f.Math class
b.instance variables
g.redeclaring a variable
c.comes into scope
h.GregorianCalendar
d.class methods
i.constant
e.overloading
Must be explicitly named in an import statement

Question 59

What are the three methods that enable you to incorporate prewritten classes with your programs?

Question 60

How does an overloaded method become ambiguous, and why might a programmer not be able to see a problem?

Question 61

Describe the purpose of creating and calling constructors that receive parameters. Why would you overload constructors?

Question 62

Explain the java.lang package and why it is important. How does this relate to the java.lang.Math class?

Question 63

Declare a GregorianCalendar object named year. Use the GregorianCalendar class and the get() method to display the current year in a println statement.

Question 64

public class StudentScores
{
private int ScoreOne;
private int ScoreTwo;
private int ScoreThree;
____
____
____
____
____
}
Using the code above, fill in the blank lines provided to create a constructor that will require parameters for the three score data fields. Be sure to include the necessary brackets and semicolons.

Question 65

public class StudentScores
{
private int ScoreOne;
private int ScoreTwo;
private int ScoreThree;
____
____
____
____
____
}
Suppose you want to assign all students a score of 95 on the third test. Using the code above, fill in the blank lines provided to create a two-parameter constructor that will require parameters for the first and second test score data fields, and will assign a value of 95 to the third test score data field. Be sure to include the necessary brackets and semicolons.

Question 66

What does it mean when a variable overrides another variable? Describe the process of declaring variables in methods and memory locations.

Question 67

When working with the GregorianCalendar class, what is the statement that will import the GregorianCalendar class using the full class path? Likewise, what statement will import the GregorianCalendar class and any other java.util classes?