Starting Out With Java Tony Gaddis - Chapter 8

Front 1

This type of method cannot access any non-static member variables in its own class.a. instanceb. voidc. staticd. non-static

Back 1

c

Front 2

When an object is passed as an argument to a method, this is actually passed.a. a copy of the objectb. the name of the objectc. a reference to the objectd. none of these; you cannot pass an object

Back 2

c

Front 3

If you write this method for a class, Java will automatically call it any time you concatenate an object of the class with a string. a. toString b. plusString c. stringConvert d. concatString

Back 3

a

Front 4

Making an instance of one class a field in another class is called ___________.a. nestingb. class fieldingc. aggregationd. concatenation

Back 4

c

Front 5

This is the name of a reference variable that is always available to an instance method and refers to the object that is calling the method. a. callingObject b. this c. me d. instance

Back 5

b

Front 6

This enum method returns the position of an enum constant in the declaration.a. positionb. locationc. ordinald. toString

Back 6

c

Front 7

Assuming the following declaration exists:enum Seasons { SPRING, WINTER, SUMMER, FALL } what is the fully qualified name of the FALL constant?a. FALLb. enum.FALLc. FALL.Seasonsd. Seasons.FALL

Back 7

d

Front 8

You cannot use the fully qualified name of an enum constant for this.a. a switch expressionb. a case expressionc. an argument to a methodd. all of these

Back 8

b

Front 9

The Java Virtual Machine periodically performs this process, which automaticallyremoves unreferenced objects from memory.a. memory cleansingb. memory deallocationc. garbage collectiond. object expungement

Back 9

c

Front 10

If a class has this method, it is called automatically just before an instance of the class is destroyed by the Java Virtual Machine. a. finalize b. destroy c. remove d. housekeeper

Back 10

a

Front 11

CRC stands fora. Class, Return value, Compositionb. Class, Responsibilities, Collaborationsc. Class, Responsibilities, Compositiond. Compare, Return, Continue

Back 11

b

Front 12

True or False: A static member method may refer to non-static member variables ofthe same class, but only after an instance of the class has been defined.

Back 12

False

Front 13

True or False: All static member variables are initialized to –1 by default

Back 13

False

Front 14

True or False: When an object is passed as an argument to a method, the method canaccess the argument.

Back 14

True

Front 15

True or False: A method cannot return a reference to an object.

Back 15

False

Front 16

True or False: You can declare an enumerated data type inside a method

Back 16

False

Front 17

True or False: Enumerated data types are actually special types of classes.

Back 17

True

Front 18

True or False: enum constants have a toString method.

Back 18

True

Front 19

The following class definition has an error. What is it?1. public class MyClass{ private int x; private double y; public static void setValues(int a, double b) { x = a; y = b; }}

Back 19

The static method setValues cannot refer to the non-static fields x and y

Front 20

Assume the following declaration exists :enum Coffee { MEDIUM, DARK, DECAF } Find the error(s) in the following switch statement:// This code has errors!Coffee myCup = DARK;switch (myCup){ case Coffee.MEDIUM : System.out.println("Mild flavor."); break; case Coffee.DARK : System.out.println("Strong flavor."); break; case Coffee.DECAF : System.out.println("Won’t keep you awake."); break; default: System.out.println("Never heard of it.");}

Back 20

You cannot use the fully-qualified names of enumconstants in the caseexpressions.

Front 21

Describe one thing you cannot do with a static method.

Back 21

Access a non-static member.

Front 22

Why are static methods useful in creating utility classes?

Back 22

They can be called directly from the class, as needed. They can be used to create utility classes that perform operations on data, but have no need to collect and store data.

Front 23

Describe the difference in the way variables and class objects are passed as argumentsto a method.

Back 23

When a variable is passed as an argument, a copyof the variable's contents is passed. The receiving method does not have accessto the variable itself. When an object is passed as an argument, a reference tothe object (which is the object's address) is passed. This allows the receivingmethod to have access to the object.

Front 24

Even if you do not write an equals method for a class, Java provides one. Describethe behavior of the equals method that Java automatically provides.

Back 24

The default equals method returns true if the memory addresses of the two objects beingcompared are the same.

Front 25

A “has a” relationship can exist between classes. What does this mean?

Back 25

It means that anaggregate relationship exists. When an object of class B is a member of classA, it can be said that class A "has a" class B object.

Front 26

What happens if you attempt to call a method using a reference variable that is setto null?

Back 26

The program will crash.

Front 27

Is it advisable or not advisable to write a method that returns a reference to an objectthat is a private field? What is the exception to this?

Back 27

It is not advisable because it will allow accessto the private fields. The exception to this is when the field is a String object. This is because String objects are immutable, meaning that they cannot bechanged.

Front 28

What is the this key word?

Back 28

The key word this is the name of a referencevariable that an object can use to refer to itself. It is available to allnon-static methods.

Front 29

Look at the following declaration:enum Color { RED, ORANGE, GREEN, BLUE }a. What is the name of the data type declared by this statement?b. What are the enum constants for this type?c. Write a statement that defines a variable of this type and initializes it with a valid value.

Back 29

a) Color b) Color.RED, Color.ORANGE, Color.GREEN,Color.BLUE c) Color myColor = Color.BLUE;

Front 30

Assuming the following enum declaration exists:enum Dog { POODLE, BOXER, TERRIER } what will the following statements display?a. System.out.println(Dog.POODLE + "\n" + Dog.BOXER + "\n" + Dog.TERRIER);b. System.out.println(Dog.POODLE.ordinal() + "\n” + Dog.BOXER.ordinal() + "\n" + Dog.TERRIER.ordinal());c. Dog myDog = Dog.BOXER;if (myDog.compareTo(Dog.TERRIER) > 0) System.out.println(myDog + " is greater than " + Dog.TERRIER);else System.out.println(myDog + " is NOT greater than " + Dog.TERRIER);

Back 30

a) POODLE BOXER TERRIER b) 0 1 2 c) BOXER is NOT greater than TERRIER

Front 31

Under what circumstances does an object become a candidate for garbage collection?

Back 31

When there are no references to it.