Deck 4: More Object Concepts

Question 1

You can overload methods correctly by providing different parameter lists for methods with the same name.

Answer 1

True

Question 2

____ 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

Answer 2

B

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

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

Question 5

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

Question 6

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 7

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

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

Question 8

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 9

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 10

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 11

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

Question 12

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

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

Question 13

Fields declared to be static are not always final .

Question 14

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

Question 15

When you multiply an int and a double , the result is the int .

Question 16

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 17

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 18

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 19

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 20

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

Question 21

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 22

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

A) import
B) enumeration
C) package
D) default constructor

Question 23

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

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

Question 24

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 25

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 26

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

A) use static variables in
B) use class variables in
C) finalize
D) overload

Question 27

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 28

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

A) reference
B) class variable
C) value
D) static variable

Question 29

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 30

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

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

Question 31

The ____ package contains is implicitly imported into Java programs and is the only automatically imported, named package.

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

Question 32

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 33

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 34

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

A) constructor
B) block
C) composition
D) package

Question 35

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

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

Question 36

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 37

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 38

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

A) inner
B) outer
C) nested
D) overlapped

Question 39

If you want all objects to share a single nonchanging value, then the field is static and ______.

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

Question 40

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

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

Question 41

Because the square root of a negative number is not defined, what is the result of this statement: System.out.println (Math.sqrt(-16));

A) Runtime error message
B) Syntax error
C) NaN
D) -4

Question 42

The java.lang package is implicitly imported into every program you write. The classes it contains are ____ that provide the basis of the Java programming language.

A) optional classes
B) static classes
C) fundamental classes
D) anonymous classes

Question 48

____ are local classes that have no identifier.

A) Anonymous classes
B)  Nonstatic member classes
C) Local classes
D) static member classes

Question 57

A Java variable's scope level is its ____.

A) constructor
B) class method
C) block
D) fundamental class

Question 59

The methods of LocalDate include getMonth() and getDayOfWeek() . Each of these methods returns a(n) ____, which is a data type that consists of a list of values.

A) array
B) constant
C) shadow array
D) enumeration

Question 61

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

Question 62

In the above code, if the simpleMethod() method received a double or integer value, the resulting output is "Method receives double parameter". Explain how Java can promote one data type to another when a parameter is passed to a method.

Question 63

Describe how a Java variable comes into and out of scope.

Question 64

What does it mean when a variable overrides another variable? 

Question 65

The Student class above will allow Student information to be constructed in various ways, but is repetitive. How could you use the this reference to reduce the amount of repetitious code and make it less error-prone?

Question 66

What is automatic type promotion in method calls? Give an example of how this works.

Question 67

Describe a block and define an outer block and an inner block.

Question 68

What is the difference between class variables and instance variables?

Question 69

What is overloading a method? What conditions must be satisfied in the parameter lists of an overloaded method?

Question 70

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 71

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

Question 72

In the above code, what happens to the value of aNumber when the main() method is executed? What happens to the value of aNumber when the firstMethod and secondMethod methods are executed?

Question 73

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

Question 74

In the above code, what would happen if calculateInterest was passed the values of 100 for the bal and .10 for the interest rate? What would happen if calculateInterest was passed the values of 100 for the bal and 10 for the interest rate? Why is it a problem when these values are passed to the calculateInterest method, and what would be a possible solution to fix the problem?

Question 75

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

Question 76

What is the phenomenon called shadowing?

Question 77

Explain why the highlighted statements will result in an illegal action.

Question 78

List and describe the four types of nested classes.

Question 79

List the three things you can do that allow you to use prewritten classes.

Question 80

Explain the java.lang package and why it is important.