Chapters 3&6
In UML diagrams, what symbol indicates that a member is public?
+
A UML diagram uses the ________ symbol to indicate that a member is private.
-
If you do not provide initialization values for a class's numeric fields, they will be automatically initialized with what number?
0
CRC stands for
Class, Responsibilities, and Collaborations
________ is the term for the relationship created by object aggregation.
Has a
Assume the following declaration exists: enum Tree{OAK,MAPLE,PINE} What will the following code display? System.out.println(Tree.OAK);
OAK
If you have defined a class SavingsAccount with a public static method getNumberOfAccounts, and created a SavingsAccount object referenced by the variable account20, which of the following will call the getNumberOfAccounts method?
SavingsAccount.getNumberOfAccounts();
+equals(object2:Stock) : boolean This is a publi method that accepts a _____ object as its argument and returns a ______ value. (separate answers with comma)
Stock, boolean
Look at the following declaration: enum Tree{OAK,MAPLE,PINE} What is the fully-qualified name of the PINE enum constant?
Tree.PINE
When a method's return type is an object, what is actually returned to the calling program?
a reference to an object of that class
A static field is created by placing the key word static before/after the access specifier and before the field's data type
after
When a method in the ________ class returns a reference to a field object, it should return a reference to a copy of the field object to prevent "security holes."
aggregate
A static field is created by placing the key word static after the access specifier and before/after the field's data type.
before
After the header, the body of the method appears inside a set of ________.
braces
You cannot use the fully-qualified name of an enum constant for a ______ expression
case
A constructor has the same name as the _____.
class
One or more objects may be created from a(n)
class
To indicate the data type of a variable in a UML diagram, you specify the variable name followed by a _____ and the data type.
colon
To indicate the data type of a variable in a UML diagram, you specify the variable name followed by a colon and the _____ _____.
data type
When you make a copy of the aggregate object and of the objects it references, you are performing a
deep copy
+setHeight(h : double) : void The above means that a public method with a parameter of data type ________ that does not return a value
double
A declaration for an enumerated type begins with this key word.
enum
You can use the ______ key word to both create your own data type and specify the values that belong to that type
enum
You may use this to compare two enum data values.
equals and compareTo methods
import java.util.Scanner; is an example of an _______ import statement.
explicit
A method that gets a value from a class's field but does not change it is known as a mutator method. (true/false)
false
The java.lang package needs to be manually imported into Java programs. (true/false)
false
The names of the enum constants in an enumerated data type must be enclosed in quotation marks. (true/false)
false
The public access specifier for a field indicates that the field may not be accessed by statements outside the class. (true/false)
false
The term "default constructor" is applied to the first constructor written by the author of the class. (true/false)
false
When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable. (true/false)
false
You can declare an enumerated data type inside of a method. (true/false)
false
The JVM periodically performs this process to remove unreferenced objects from memory.
garbage collection
"________" is the term for the relationship created by object aggregation.
has a
Assume the class BankAccount has been created, and the following statement correctly creates an instance of the class: BankAccount account = new BankAccount(5000.0); What is true about the following? System.out.println(account); The account object's toString method will _______ be called
implicitly
You use this key word to import a class.
import
A class that is defined inside of another class is called a(n)
inner class
Another term for an object of a class is a(n)
instance
Another term for an object of a class is a(n) ________.
instance
When an object is created, the attributes associated with the object are called
instance fields
Methods that operate on an object's fields are called
instance methods
The key word this is the name of a reference variable that an object can use to refer to ______.
itself
If object1 and object2 are objects of the same class, to make object2 a copy of object1, write a _______ for the class that will make a field by field copy of object 1 data members into object 2's data members.
method
A method's signature consists of the
method name and parameter list
Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.
methods
The only limitation that static methods have is they cannot refer to ________ members of the class.
nonstatic
By default, a reference variable that is an instance field is initialized to the value
null
UML diagrams do not contain
object names
In the blueprint/house analogy, think of a class as a blueprint that describes a house and ________ as instances of the house built from the blueprint.
objects
When a field is declared static, how many copies of the field will there be in memory?
one
Enumerated types have this method, which returns the position of an enum constant in the declaration list.
ordinal
________ is having two or more methods with the same name, but different signatures.
overloading
A group of related classes is called a(n)
package
Data hiding, which means that critical data stored inside the object is protected from code outside the object, is accomplished in Java by using the ______ access specifier on the class fields.
private
It is common practice in object-oriented programming to make all of a class's fields _______.
private
You should not define a class field that is dependent upon the values of other class fields in order to avoid having ____ _____.
stale data
What will be returned from the method, if the following is the method header? public Rectangle getRectangle()
the address of an object of the Rectangle class
A class's static methods do not operate on the fields that belong to any instance of the class. (true/false)
true
A constructor is a method that performs initialization or setup operations. (true/false)
true
A constructor is a method that is automatically called when an object is created. (true/false)
true
A method may have zero or more parameter variables. (true/false)
true
A method that stores a value in a class's field or in some other way changed the value of a field is known as a mutator method. (true/false)
true
An access specifier indicates how the class may be accessed. (true/false)
true
An enumerated data type is actually a special type of class. (true/false)
true
An instance of a class does not have to exist in order for values to be stored in a class's static fields. (true/false)
true
If a class has a method named finalize, it is called automatically just before an instance of the class is destroyed by the garbage collector. (true/false)
true
If you write a toString method for a class, Java will automatically call the method any time you concatenate an object of the class with a string. (true/false)
true
Shadowing is the term used to describe where the field name is hidden by the name of a local or parameter variable. (true/false)
true
The key word this is the name of a reference variable that an object can use to refer to itself. (true/false)
true
The scope of a local variable is the method in which they are defined. (true/false)
true
The term "no-arg constructor" is applied to any constructor that does not accept arguments. (true/false)
true
When an object is passed as an argument, it is actually a reference to the object that is passed. (true/false)
true
enum constants have a toString method. (true/false)
true
The "has a" relationship is sometimes called a(n) ________ because one object is part of a greater whole.
whole-part relationship
import java.util.*; The above is a ________ import statement.
wildcard
Which of the following is not involved in finding the classes when developing an object-oriented application?
write the code
