Java Final

Front 1

Software objects share two characteristics of ________ and ___________.

Back 1

State, behavior

Front 2

Benefits of modeling using objects in software include.

Back 2

All of the above (Code re-use, Information-hiding, Modularity, Pluggability and debugging ease)

Front 3

The purpose of a class in object-oriented programming environment is to model the state and behavior of a real-world object.

Back 3

True

Front 4

In object-oriented terms what is used as a blueprint to model a real-world object?

Back 4

Class

Front 5

Object-oriented programming allows for inheritance so commonly used state and behavior can be reused. The class that is inherited from is the _______ and the new class is the ______.

Back 5

Superclass, Subclass

Front 6

A declaration statement declares a variable. The following code is a correct example of a declaration statement:

double value = 100;

Back 6

True

Front 7

How many superclasses can a subclass extend when using inheritance in object-oriented programming using the Java programming language?

Back 7

One

Front 8

When using inheritance what does the new class inherit when it is derived from another class?

Back 8

State, Behavior

Front 9

When implementing an interface in object-oriented programming all ________ must be included in the source code for the class to compile.

Back 9

Methods

Front 10

What programming best practice should be used when identifying state and behaviors that are derived from another class or defined locally in the new class?

Back 10

Comment the code

Front 11

Local variables are commonly used in methods to store a temporary state. Local variables are visible _________.

Back 11

Between the opening and closing braces of the method where they are declared.

Front 12

Given the signature for the required main method in the Java programming language, public static void main (String[] args), what is args called from a variable perspective?

Back 12

Parameter

Front 13

Compound assignment operators combine an arithmetic operator with the _______ operator.

Back 13

=

Front 14

An expression can comprise

Back 14

A, B, and C (Variables, Operators, Method invocations)

Front 15

An expression statement forms a complete unit of execution with a terminating semicolon. The following code is a correct example of an expression statement:

Bicycle myBike = new Bicycle()

Back 15

False

Front 16

Regarding source code, a block is a group of ()... n statements balanced between _____.

Back 16

{ }

Front 17

When using the switch decision-making statement the break statement is required.

Back 17

False

Front 18

Control flow statements in source code files break up the flow of execution and allow for programs to execute blocks of code _______.

Back 18

Conditionally

Front 19

Which of the following is considered a decision-making statement?

Back 19

All of the above (if, if/else, if/else if/else, switch)

Front 20

Which of the following is considered a looping statement?

Back 20

A, B, and C (for, while, do/while)

Front 21

Which of the following is NOT considered branching statements?

Back 21

goto

Front 22

When using the if/else if decision-making statement the else leg is not required.

Back 22

True

Front 23

When declaring a class which of the following components are REQUIRED?

Back 23

A and B (Class name, Class Body using {})

Front 24

Within a class, a method declaration has up to six components, The REQUIRED elements of a method declaration include _____, _____, _____, _____.

Back 24

Method's return type, name, (), {}

Front 25

What are the components of a method declaration that comprise the method signature?

Back 25

Method name and method parameter list

Front 26

The object-oriented concept of software reuse allows a class to be created once and used ______.

Back 26

As many times as desired to include extending it using inheritance

Front 27

A unique aspect of some object-oriented programming languages is not having to explicitly declare a class constructor. this is true with the Java programming language. When instantiating an instance of a class and a class constructor has not been explicitly declared how is the following source code valid?

Bicycle bike1 = new Bicycle();

Back 27

The compiler automatically provides a no-argument constructor

Front 28

If a class explicitly declares a constructor that takes 0....n parameters when instantiated what happens to the default constructor of the class?

Back 28

It no longer exists

Front 29

The Java Application Programming Interface (API) includes predefined classes grouped into categories of related classes.

Back 29

True

Front 30

Select the statement that is true about Java programming language.

Back 30

All of the above (Java is case sensitive, White space is not ignored, Semicolons must be used at the end of variable)

Front 31

If there are an unknown number of parameters being passed to a method a software developer can use a construct called _______.

Back 31

varargs

Front 32

The ternary operator takes three operands and uses the (?:) notation. What control structure does the ternary operator mimic?

Back 32

If/else

Front 33

Which of the following is NOT valid regarding methods calls in the Java programming language?

Back 33

All methods are automatically public so they can be called whenever throughout a program

Front 34

Regarding object-oriented programming, declaration means that a variable name is associated with an object type and creates an object of that type.

Back 34

False

Front 35

When method parameters have the same name as class fields this is called ___________.

Back 35

Shadowing

Front 36

When having to programmatically differentiate a parameter having the same name as a field of a class what keyword can resolve this issue with the compiler when setting the field value equal to the argument value passed into the method?

Back 36

this

Front 37

Regarding object-oriented programming, when an object is instantiated the keyword new is used, memory is allocated, and a reference to that memory is returned.

Back 37

True

Front 38

How are primitive and reference data arguments pass into a method?

Back 38

By value

Front 39

An interface can and should be instantiated

Back 39

False

Front 40

A method in Java can return primitive data types, __________, or __________.

Back 40

class, interface

Front 41

What is used in the java programming language to organize classes and interfaces in a logical manner?

Back 41

Package

Front 42

When defining an interface in the object-oriented programming language Java it can comprise which of the following?

Back 42

All of the above (Constants, Keyword "interface", Default methods, Modifiers)

Front 43

The keyword this is used to reference _______.

Back 43

The current object

Front 44

An array is a container object to that holds a _______ number of values of a ________ data type.

Back 44

Fixed, single

Front 45

To create a static method in the Java programming language the modifier __________ must be used in the declaration.

Back 45

Static

Front 46

Returning a value from a method that is declared with a return type of void results in a compiler error.

Back 46

True

Front 47

Unary operators _________.

Back 47

Both B and C (Require one operand, Are used for incrementing/decrementing a value by one)

Front 48

The length of an array is established when the array is created.

Back 48

True

Front 49

Which of the following declares an array correctly from a syntax perspective?

Back 49

Both B and C

(String[] stringArray; String stringArray[];)

Front 50

Operators are special symbols that perform specific operations on _________ operands, and return a result.

Back 50

One, two, or three

Front 51

Operators with higher precedence are evaluated _______ operators with relatively _____________ precedence.

Back 51

Before, lower

Front 52

Each item in an array is called an ___________ and to access them programmatically user an ______.

Back 52

Element, index

Front 53

When defining classes in the Java programming language a software developer can extend ________ superclasses and implement ________ interfaces.

Back 53

One, unlimited

Front 54

A class that uses an explicitly constructor invocation uses the keyword this to _______.

Back 54

Call another constructor in the same class

Front 55

When a method has a return type other than void what data type can be returned from that method?

Back 55

The returned data type must match the declared return data type

Front 56

Access level modifiers define how other classes can reference a field or invoke a method

Back 56

True

Front 57

What are the two required components of an array declaration in the Java programming language?

Back 57

Type and name

Front 58

When does a method return to the code that invoked it?

Back 58

A, B or C (Completes all the statements in the method, Reaches a return statement, Throws and exception)

Front 59

Polymorphism refers to a principle in biology in which an organism or species can have many different forms or stages.

Back 59

True

Front 60

Static fields of a class are common to all objects.

Back 60

True

Front 61

The content pan of a top-level container (i.e. JFrame, JDialog, JApplet) is the container where the root pane's visible components are comprised, excluding the ________.

Back 61

JMenuBar

Front 62

When defining an interface in the object-oriented programming language Java it can comprise which of the following?

Back 62

All of the above (Constants, Keyword "interface", Default methods)

Front 63

An ActionListener is equivalent to an event handler.

Back 63

True

Front 64

When writing an ActionListener there are specific steps that should be followed. Select the correct combination of steps.

Back 64

A, B and C (Declare an even handler class that implements the ActionListener interfact, Register an instance of the defined event handler class on one or more components, Ensure the class that implements interface ActionListener includes method public void actionPerformed(ActionEvent e) {} )

Front 65

An interface can and should be instantiated.

Back 65

False

Front 66

Which of the following are valid class member access levels?

Back 66

All of the above (public, package-private, private)

Front 67

The keyword this is used to reference ________.

Back 67

The current object

Front 68

The javax.swing and javax.swing.event, or Swing API, has 18 public packages that group features for developing user interfaces, this is known as part of the ________.

Back 68

Java Foundation Classes (JFC)

Front 69

JDialog is one of the three top-level containers

Back 69

True

Front 70

What are the options for the JDialog setDefaultCloseOperation?

Back 70

All of the above (DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE, DISPOSE_ON_CLOSE)

Front 71

A JOptionPane implementation uses a JDialog behind the scenes

Back 71

True

Front 72

Which of the following is NOT one of the four standard icons supported by JOptionPane?

Back 72

Alert

Front 73

GridBagLayout layout manager uses ____ to specify the size and position characteristics of its components.

Back 73

GribBagConstraints

Front 74

Which java programming language layout manager arranges the components into rows and columns using equal-sized rectangular grid?

Back 74

GridLayout

Front 75

GridBagLayout layout manager allows for components to span multiple rows and columns

Back 75

True

Front 76

When adding components to a JPanel using the FlowLayout layout manager how are the components placed if not specified?

Back 76

Left to right in the order they were added

Front 77

Which layout manager is the default layout for class javax.swing.JPanel?

Back 77

FlowLayout

Front 78

BoxLayout allows the developer to do which of the following?

Back 78

Align components

Front 79

GridBagLayout is the most flexible layout manager as well as one of the most simple.

Back 79

False

Front 80

CardLayout is often controlled by a JComboBox in order to determine which ______ to display.

Back 80

Panel

Front 81

Which of the following is not one of the 5 legacy compass-based areas of the BoarderLayout layout manager class?

Back 81

LEFT

Front 82

By default a JOptionPane creates JDialogs that are modal.

Back 82

True

Front 83

CardLayout allows for implementing an area that contains different components at different times.

Back 83

True

Front 84

Two of the six layout managers provided by the Java API were designed with the intent to use them with GUI builder tools, they are _______ and ___________.

Back 84

SpringLayout, GroupLayout

Front 85

Which of the following statements is true regarding when to use a JTextArea?

Back 85

To display multiple lines of text that optionally allow the user to edit the text

Front 86

JTextArea is customizable, if the developer wanted to allow line wrapping which method would be called?

Back 86

textArea.setLineWrap(true);

Front 87

Which of the legacy locations for the 5 BorderLayout areas is still maintained in the perferred standard to adjust to languages with different orientations instead of points of a compass?

Back 87

CENTER

Front 88

Which layout manager is the default layout for the 3 top-level container classes in the javax.swing package?

Back 88

BorderLayout

Front 89

The JDialog class is a subclass of the java.awt.Dialog class

Back 89

True

Front 90

When a JDialog is set to be modal and is visble it does NOT block input to all other windows in the application

Back 90

False

Front 91

When using FlowLayout, if the width of a container is not wide enough to accommodate all the components in a single row how does the layout manager respond?

Back 91

Starts a new row

Front 92

When using the JDialog constructor defined with two parameters where the second parameter is data type boolean, the second parameter sets if the JDialog is __________.

Back 92

Modal

Front 93

The layout above that places components in 5 specific areas is representative of which layout manager?

Back 93

BorderLayout

Front 94

When declaring a constant in the Java programming language which keyword(s) ensures that the value of the constant cannot be changed?

Back 94

final

Front 95

A popup menu bar is _______ until the user invokes the appropriate commands to make it appear

Back 95

Invisble

Front 96

To add a clickable button to a user interface the javax.swing class JButton is commonly used. Which of the following statements is true about the class JButton?

Back 96

A JButton instance can display its text in a different place relative to its image

Front 97

The purpose of writing ActionListeners is to define what code should be executed when the application fires a specific ActionEvent.

Back 97

True

Front 98

Each of the 3 top level container classes has a content pane that contains the visible components in its container user interface.

Back 98

True

Front 99

Which method would be called on a top-level container if the software developer wanted to explicitly set the content pane?

Back 99

setContentPane(somePane)

Front 100

What is the key purpose of default methods regarding interfaces?

Back 100

Allows for binary compatibility with previously written code while providing the opportunity to add new functionality

Front 101

actionPerformed(ActionEvent) is the only method that is required to be implemented when implementing the ActionListener interface in Java.

Back 101

True

Front 102

Menus in the Java programming language are unique as they aren't placed with the other components in the user interface

Back 102

True

Front 103

With the exception of the three top-level containers all Swing components that start with the letter "J" descend from the _________ class.

Back 103

JComponent

Front 104

Java Swing text components only display texts and do not allow for the user to edit the text

Back 104

False

Front 105

By default a JTextArea is editable

Back 105

True

Front 106

The layout above that displays components from left to right in the order they were added to the user interface is representative of which layout manager?

Back 106

FlowLayout

Front 107

The layout above that displays components in a row/column format with each component being of equal size is representative of which layout manager?

Back 107

GridLayout

Front 108

What is the direct superclass for class BattleshipUI?

Back 108

JFrame

Front 109

Which menu component is set on the JFrame instance?

Back 109

JMenuBar

Front 110

When using menus, what is the order that menu components are added to each other?

Back 110

Add a JMenuItem to a JMenu, add a JMenu to a JMenuBar

Front 111

What is the code at line 58 called?

Back 111

Overridden no-argument constructor

Front 112

What is the purpose of the method initComponents() defined starting at line 65?

Back 112

Initializes the components that are part of class BattleshipUI

Front 113

If line 68 were not included and the user closed the UI, what happens to the application processing in the background?

Back 113

It keeps running

Front 114

Line 86, 91, 96, 101, 108, 112, 118, 126, and 130 all call the method addActionListener(). What is the purpose of this method?

Back 114

To register an action listener

Front 115

JLabels display text and they are also editable during run time.

Back 115

False

Front 116

Line 265 defines method getThisParent(), what is this method doing?

Back 116

Returning the reference to the instance of class BattleshipUI using keyword this

Front 117

Line 327 is the definition for private class ShipListener. In the actionPerformed(ActionEvent e) method what is the source code evaluating?

Back 117

Which item in the JComboBox was selected

Front 118

Line 368-370 of the source code are doing what?

Back 118

Disabling the relative JComponents (i.e. JButton and JComboBox)

Front 119

What is the data type of attribute billValid?

Back 119

BillValid

Front 120

What is the name of the class where data type BillValid is defined?

Back 120

Enumerations

Front 121

What value does the instance of class Random have to return from method randomNumber.nextInt(100) to set attribute billValid equal to the enumerated value of BillValid.FALSE?

Back 121

50

Front 122

Where is attribute sensors instantiated?

Back 122

In the custom constructor CentralComputer()

Front 123

When writing an inline comment to either document the source code or insert TODO statements for work that needs to be done the appropriate format is _______.

Back 123

// this is an inline comment

Front 124

What is the data type of the return value in method getProductSelected()?

Back 124

String

Front 125

In method setProductSelected(String aProductSelected), when the substring(1) method is called on attribute productSelected, the 1 indicates _____.

Back 125

1 is the start index.

Front 126

In method

setProductSelected(String aProductSelected), what is the purpose method call Integer.parseInt(productSelected.substring(1))?

Back 126

Converts a String to an int

Front 127

In method

setProductSelected(String aProductSelected),

if the user selected a product that had a count greater than 0 and they entered greater than or equal to the price of the product, what state is the VendingMachine application's CentralComputer set to?

Back 127

VendingState.DISPENSED

Front 128

Method setState is defined with one parameter. What is the data type of the parameter

Back 128

VendingState

Front 129

In method setMoneyEntered() what message is displayed to the user when the conditional

if(billValidator.getBillValid()) equals BillValid.FALSE?

Back 129

Bill not valid, try again!

Front 130

In the method setMoneyEntered() what message is displayed to the user when the conditional if(coinIdentifier.getCoinValid()) equals CoinValid.TRUE?

Back 130

No message

Front 131

In method setProductSelected() what message is displayed to the user when the conditional if(moneyEntered >= productManager.getProductPrice(row, column) evaluates false?

Back 131

Enter more funds

Front 132

In method setProductSelected() what message is displayed to the user when the conditional if(productManager.getProductCount(row, column) evaluates false?

Back 132

Product out of stock, select again

Front 133

What is the data type of attribute coinValid?

Back 133

CoinValid

Front 134

What is the name of the class where data type CoinValid is declared?

Back 134

Enumerations

Front 135

Method getCoinValid() casts parameter value to an instance of which class?

Back 135

BigDecimal

Front 136

What is the conditional if statement if(cents.inValue() % 5 == 0) evaluating?

Back 136

If the integer value of cents divided by 5 results in a remainder of 0

Front 137

What key word is used when declaring an enumeration?

Back 137

enum

Front 138

Unless otherwise defined what is the int value of the first member of the enumeration?

Back 138

0

Front 139

What are the data types of the two parameters defined in the custom constructor?

Back 139

int, double

Front 140

What is the return type of method setCount(int count)?

Back 140

void

Front 141

When declaring a two-dimensional array and you are not initializing the data during declaration, you must explicity set the size of the ________.

Back 141

rows

Front 142

When using indexes to reference an element in array productData[0][2]. value 0 is the _______ and value 2 is the________.

Back 142

row, column

Front 143

Given the class definition of ProductManager, how does the two-dimensional array productData get initialized with instances of class Product?

Back 143

The custom constructor ProductManager() is called when instantiating an instance of the class which calls method initializeData().

Front 144

What is the data type of the array productData?

Back 144

Product

Front 145

What method from class Product is called in method getProductCount()?

Back 145

getCount()

Front 146

What method from class Product is called in method dispenseProduct()?

Back 146

setCount() and getCount()

Front 147

What method from class Product is called in method repriceProduct()?

Back 147

setPrice()

Front 148

Information hiding is accomplished in class Sensors by creating _____________ and _________ to access the class attributes.

Back 148

Getters, setters

Front 149

What is the data type of attribute dispensed?

Back 149

Dispensed

Front 150

What layout manager is used to display the objects on the JPanel?

Back 150

GridBagLayout

Front 151

When defining custom constructor Keypad() what happens to the default constructor of the class?

Back 151

It no longer exists

Front 152

Object moneyEntered calls method .setBorder() to set its border using which class?

Back 152

BorderFactory

Front 153

What is the term to describe what is happening when calling method .addActionListener(new KeyPressAction()) for each of the letter, number, and dot JButtons?

Back 153

Registering the event handler

Front 154

What is the name of the inner class declared to handle events fired when JButton money is clicked?

Back 154

MoneyAction

Front 155

Method setProductBin() calls method setProductBin() defined in class _____________.

Back 155

CentralComputer

Front 156

Inner class KeyPressAction implements which interface?

Back 156

ActionListener

Front 157

What executable statement is performed if e.getActionCommand() equals a period (or dot)?

Back 157

JButton dot is disabled

Front 158

When the VendingMachine application's CentralComputer is in state VendingState.PRODUCT, to accept the e.getActionCommand() input as part of attribute product when the user clicks the A, B, C, or D JButton, what other condition must be true?

Back 158

Attribute product is equal to an empty String

Front 159

When evaluating the length of attribute product being greater than 0 and less than 2 the correct syntax for the and condition is

Back 159

&&

Front 160

Inner class MoneyAction implements interface ActionListener, as a result it must override method _________.

Back 160

actionPerformed(ActionEvent e)

Front 161

Inner class MoneyAction is registered to a single JButton. When the text on the JButton equals "Finished" what is it updated to?

Back 161

Enter Money

Front 162

Method imageResize() is defined to receive one parameter, it also returns a value, what is the data type for the parameter and return type?

Back 162

ImageIcon

Front 163

Method imageResize() calls what method from class Image to resize the image based on specified pixel size?

Back 163

getScaledInstance()

Front 164

Constructor ProductBin() is the default constructor created by the compiler

Back 164

false

Front 165

What class is used to set the preferred size of object bin?

Back 165

Dimension

Front 166

What would be the runtime result if method keypad.setProductBin(productBin) was called before the instance of ProductBin() was instantiated?

Back 166

The application would throw a NullPointerException

Front 167

What is the significance of class VendingMachine.java in the overall VendingMachine application

Back 167

All of the above (VendingMachine instantiates an instance of VendingMachineUI which invokes the user interface of the application, VendingMachine contains the public static void main(String[] args) method that must be defined in order for the Java Virtual Machine to start the application, VendingMachine is the emply point into the VendingMachine application during runtime)