Home Page Science Engineering Electrical Engineering Computer Programming Combo with "CIS 283 Final" and 1 other - Flashcards

Combo with "CIS 283 Final" and 1 other – Flashcards

Q: Which of the following will open a file named MyFile.txt and allow you to append data to its existing contents?

FileWriter fwriter = new FileWriter(\"MyFile.txt\", true); PrintWriter outFile = new PrintWriter(fwriter);

Q: You can use this method to determine whether a file exists.

The File class\'s exists method

Livia Baldwin

20 January 2023

Unlock all answers in this set

Unlock answers

question

This is a control structure that causes a statement or group of statements to repeat.

answer

loop

question

This type of loop will always be executed at least once.

answer

post-test loop

question

________ is the process of inspecting data given to the program by the user and determining if it is valid.

answer

input validation

question

This is a value that signals when the end of a list of values has been reached.

answer

sentinel

question

Which of the following will open a file named MyFile.txt and allow you to append data to its existing contents?

answer

FileWriter fwriter = new FileWriter("MyFile.txt", true); PrintWriter outFile = new PrintWriter(fwriter);

question

In all but rare cases, loops must contain within themselves:

answer

A way to terminate.

question

A for loop normally performs which of these steps?

answer

All of these: -Initializes a control variable to a starting value -Tests the control variable by comparing it to a maximum/minimum value and terminate when the variable reaches that value -Updates the control variable during each iteration

question

This type of loop is ideal in situations where you always want the loop to iterate at least once.

answer

do-while loop

question

You can use this method to determine whether a file exists.

answer

The File class's exists method

question

The while loop has two important parts: (1) a boolean expression that is tested for a true or false value, and (2) a statement or block of statements that is repeated as long as the expression is true.

answer

True

question

In the for loop, the control variable cannot be initialized to a constant value and tested against a constant value.

answer

False

question

You can use the PrintWriter class to open a file for writing and write data to it.

answer

True

question

In a for statement, the control variable can only be incremented.

answer

False

question

A file must always be opened before using it and closed when the program is finished using it.

answer

True

question

When you pass the name of a file to the PrintWriter constructor, and the file already exists, it will be erased and a new empty file with the same name will be created.

answer

True

question

Which of the following are classes from the Java API?

answer

All of these: Scanner Random PrintWriter

question

Java allows you to create objects of this class in the same way you would create primitive variables.

answer

String

question

You should not define a class field that is dependent upon the values of other class fields:

answer

In order to avoid having stale data.

question

A constructor:

answer

Has the same name as the class.

question

A class specifies the ________ and ________ that a particular type of object has.

answer

fields, methods

question

In UML diagrams, this symbol indicates that a member is public:

answer

question

A constructor is a method that:

answer

Performs initialization or setup operations

question

This is a group of related classes.

answer

package

question

The following package is automatically imported into all Java programs.

answer

java.lang

question

A class in not an object, but a description of an object.

answer

True

question

A method that stores a value in a class's field or in some other way changes the value of a field is known as a mutator

answer

True

question

A constructor is a method that is automatically called when an object is created.

answer

True

question

A method that gets a value from a class's field but does not change it is known as a mutator method.

answer

False

question

When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable.

answer

False

question

"Shadowing" is the term used to describe where the field name is hidden by the name of a local or parameter variable.

answer

True

question

The term "no-arg constructor" is applied to any constructor that does not accept arguments.

answer

True

question

The increment operator is:

answer

question

If a loop does not contain within itself a way to terminate, it is called a(n):

answer

Infinite loop

question

This variable controls the number of times that the loop iterates.

answer

local control variable

question

If you are using a block of statements, don't forget to enclose all of the statements in a set of:

answer

braces

question

This type of loop allows the user to decide the number of iterations.

answer

user controlled loop

question

A loop that repeats a specific number of times is known as a(n):

answer

counter-controlled loop

question

Before entering a loop to compute a running total, the program should first do this.

answer

Set the accumulator where the total will be kept to an initial value, usually zero

question

When using the PrintWriter class, which of the following import statements would you write near the top of your program?

answer

import java.io.*;

question

Assume that inputFile references a Scanner object that was used to open a file. Which of the following while loops shows the correct way to read data from the file until the end of the file is reached?

answer

while (inputFile.hasNext()) (...)

question

Which of the following are pre-test loops?

answer

while, for

question

A loop that executes as long as a particular condition exists is called a(n):

answer

conditional loop

question

A sentinel value ________ and signals that there are no more values to be entered.

answer

is a special value that cannot be mistaken as a member of the list

question

This is an item that separates other items.

answer

delimiter

question

Assuming that inputFile references a Scanner object that was used to open a file, which of the following statements will read an int from the file?

answer

int number = inputFile.nextInt();

question

Given the following statement, which statement will write "Calvin" to the file DiskFile.txt? PrinterWriter diskout = new PrintWriter(DiskFile.txt");

answer

diskOut.println("Calvin");

question

What will be printed after the following code is executed? for (int number = 5; number <= 15; number +=3) System.out.print(number + ", ");

answer

5, 8, 11, 14

question

What will be the value of x after the following code is executed? int x = 10; do ( x*=20; ) while (x < 5);

answer

The loop will not be executed, the initial value of x > 5

question

What will be the value of x after the following code is executed? int x = 10, y = 20; while (y < 100) ( x+=y; y += 20; )

answer

210

question

What will be the value of x after the following code is executed? int x. y = 15, z = 3; x = (y--) / (++z);

answer

question

What will be the value of x after the following code is executed? int x = 10; for (int y = 5; y < 20; y =+5) x +=y;

answer

question

What will be the value of x after the following code is executed? int x = 10; do ( x *= 20; ) while (x > 5);

answer

this is an infinite loop

question

What will be the value of x after the following code is executed? int x = 10, y = 20; while (y < 100) ( x += y; )

answer

this is an infinite loop

question

What will be the value of x after the following code is executed? int x, y = 4. z = 6; x = (y++) * (++z);

answer

question

For the following code, which statement is not true? public class Circle { private double radius; public double x; private double y; }

answer

y is available to code that is written outside the Circle class.

question

In the following code, what values could be read into number to terminate the while loop? Scanner keyboard = new Scanner(System.in); System.out.print("Enter a number: "); int number = keyboard.nextInt(); while (number < 100 || number > 500) { System.out.print("Enter another number: "); number = keyboard.nextInt(); }

answer

Numbers in the range 100 - 500

question

How many times will the following do-while loop be executed? int x = 11; do { x += 20; } while (x > 100);

answer

question

make sure you are in the same directory or folder where the MyClass.java file is located.

answer

GOF5eMC_CH01_q06. Suppose you are at an operating system command line, and you are going to use the following command to compile a program: Before entering the command, you must

question

the methods that operate on the data.

answer

GOF5eMC_CH01_q07. An object typically hides it data, but allows outside code to access

question

object

answer

GOF5eMC_CH01_q19. A(n) ________ is a software entity that contains data and procedures.

question

answer

GOF5eMC_CH01_q27. How many bits are in a byte?

question

java ReadIt

answer

GOF5eMC_CH01_q02. Which of the following commands will run the compiled Java program named ReadIt?

question

symbolic names made up by the programmer that represents locations in the computer's RAM.

answer

GOF5eMC_CH01_q09. Variables are

question

data hiding

answer

GOF5eMC_CH01_q12. A characteristic of ________ is that only an object's methods are able to directly access and make the changes to the object's data.

question

are highly portable.

answer

GOF5eMC_CH01_q13. Because Java byte code is the same on all computers, compiled Java programs

question

read and interpreted by the JVM.

answer

GOF5eMC_CH01_q15. Byte code instructions are

question

words that have a special meaning in the programming language.

answer

GOF5eMC_CH01_q17. Key words are

question

Rules that must be followed when writing a program.

answer

GOF5eMC_CH01_q23. What is syntax?

question

attributes.

answer

GOF5eMC_CH01_q30. The data contained in an object is known as

question

'True'.

answer

GOF5eTF_CH01_q02. The Java Virtual Machine is a program that reads Java byte code instructions and executes them as they are read.

question

'True'.

answer

GOF5eTF_CH01_q07. Encapsulation refers to the combining of data and code into a single object.

question

'False'.

answer

GOF5eTF_CH01_q08. Java source files end with the .class extension.

question

.java.

answer

GOF5eMC_CH02_q02. When saving a Java source file, save it with an extension of

question

Identifiers can contain spaces.

answer

GOF5eMC_CH02_q04. Which of the following is not a rule that must be followed when naming identifiers?

question

answer

GOF5eMC_CH02_q06. What is the result of the following expression?

question

answer

GOF5eMC_CH02_q08. What is the result of the following expression?

question

x = (float)y;

answer

GOF5eMC_CH02_q10. Which of the following statements will correctly convert the data type, if x is a float and y is a double?

question

x = 37, y = 5

answer

GOF5eMC_CH02_q12. What output will be displayed as a result of executing the following code?

question

double r = 2.9X106;

answer

GOF5eMC_CH02_q14. Which of the following statements is invalid?

question

evaluating conditions that are either true or false.

answer

GOF5eMC_CH02_q16. Variables of the boolean data type are useful for

question

the memory address where "John Doe" is located

answer

GOF5eMC_CH02_q18. In the following Java statement what value is stored in the variable name?

question

class definition.

answer

GOF5eMC_CH02_q20. A Java program must have at least one

question

Scanner keyboard = new Scanner(System.in);

answer

GOF5eMC_CH02_q22. Which of the following statements correctly creates a Scanner object for keyboard input?

question

variable

answer

GOF5eMC_CH02_q24. The primitive data types only allow a(n) ________ to hold a single value.

question

import javax.swing.JOptionPane;

answer

GOF5eMC_CH02_q26. This statement tells the compiler where to find the JOptionPane class and makes it available to your program.

question

input dialog

answer

GOF5eMC_CH02_q28. A(n) ________ is a dialog box that prompts the user for input.

question

answer

GOF5eMC_CH02_q30. If you wish to use the System.out.printf method to print a string argument, use the ________ format specifier.

question

'True'.

answer

GOF5eTF_CH02_q01. Programming style includes techniques for consistently putting spaces and indentation in a program so visual cues are created.

question

'False'.

answer

GOF5eTF_CH02_q02. Both character literals and string literals can be assigned to a char variable.

question

'True'.

answer

GOF5eTF_CH02_q03. A variable's scope is the part of the program that has access to the variable.

question

'True'.

answer

GOF5eTF_CH02_q04. Named constants are initialized with a value, and that value cannot change during the execution of the program.

question

'True'.

answer

GOF5eTF_CH02_q05. When you call one of the Scanner class's methods to read a primitive value, such as nextInt or nextDouble, and then call the nextLine method to read a string, an annoying and hard-to-find problem can occur.

question

'False'.

answer

GOF5eTF_CH02_q06. A message dialog is a quick and simple way to ask the user to enter data.

question

'True'.

answer

GOF5eTF_CH02_q07. The Java API provides a class named Math, which contains numerous methods that are useful for performing complex mathematical operations.

question

'True'.

answer

GOF5eTF_CH02_q08. Unlike a console program, a program that uses JOptionPane does not automatically stop executing when the end of the main method is reached.

question

'True'.

answer

GOF5eTF_CH02_q09. The System.out.printf method allows you to format output in a variety of ways.

question

'True'.

answer

GOF5eTF_CH02_q10. If you use a flag in a format specifier, you must write the flag before the field width and the precision.

question

both the things a class is responsible for knowing and the things a class is responsible for doing

answer

GOF5eMC_CH03_q02. A class's responsibilities include

question

instance methods.

answer

GOF5eMC_CH03_q04. Methods that operate on an object's fields are called

question

methods

answer

GOF5eMC_CH03_q06. Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.

question

objects

answer

GOF5eMC_CH03_q08. 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.

question

a public method with a parameter of data type double that does not return a value

answer

GOF5eMC_CH03_q10. What does the following UML diagram entry mean?

question

the method in which they are defined.

answer

GOF5eMC_CH03_q12. The scope of a local variable is

question

may have zero or more parameter variables.

answer

GOF5eMC_CH03_q14. A method

question

The z field is available to code that is written outside the Sphere class.

answer

GOF5eMC_CH03_q16. For the following code, which statement is not true?

question

object names.

answer

GOF5eMC_CH03_q18. UML diagrams do not contain

question

creates an object in memory.

answer

GOF5eMC_CH03_q20. The key word new

question

braces, {}.

answer

GOF5eMC_CH03_q22. After the header, the body of the method appears inside a set of

question

The y field is available to code that is written outside the Circle class.

answer

GOF5eMC_CH03_q24. For the following code, which statement is not true?

question

the variable name followed by a colon and the data type.

answer

GOF5eMC_CH03_q26. To indicate the data type of a variable in a UML diagram, you specify

question

the parameter variable holds the address of the argument.

answer

GOF5eMC_CH03_q28. When an argument is passed by value,

question

be automatically initialized with 0.

answer

GOF5eMC_CH03_q30. If you do not provide initialization values for a class's numeric fields, they will

question

'True'.

answer

GOF5eTF_CH03_q01. An access specifier indicates how the class may be accessed.

question

'False'.

answer

GOF5eTF_CH03_q02. A method that gets a value from a class's field but does not change it is known as a mutator method.

question

'True'.

answer

GOF5eTF_CH03_q03. The term "no-arg constructor" is applied to any constructor that does not accept arguments.

question

'False'.

answer

GOF5eTF_CH03_q04. When a local variable in an instance method has the same name as an instance field, the instance field hides the local variable.

question

'False'.

answer

GOF5eTF_CH03_q05. The public access specifier for a field indicates that the field may not be accessed by statements outside the class.

question

'False'.

answer

GOF5eTF_CH03_q06. The term "default constructor" is applied to the first constructor written by the author of the class.

question

'True'.

answer

GOF5eTF_CH03_q07. 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.

question

'True'.

answer

GOF5eTF_CH03_q08. A constructor is a method that is automatically called when an object is created.

question

'True'.

answer

GOF5eTF_CH03_q09. The java.lang package is automatically imported into all Java programs.

question

'True'.

answer

GOF5eTF_CH03_q10. Shadowing is the term used to describe where the field name is hidden by the name of a local or parameter variable.

question

str1.equals(str2)

answer

GOF5eMC_CH04_q01. If str1 and str2 are both String objects, which of the following expressions will correctly determine whether or not they are equal?

question

the statement or block following the else is executed.

answer

GOF5eMC_CH04_q02. In an if-else statement, if the boolean expression is false

question

ans = 60, x = 0, y = 50

answer

GOF5eMC_CH04_q03. What will be the values of ans, x, and y after the following statements are executed?

question

answer

GOF5eMC_CH04_q05. What will be the value of x after the following code is executed?

question

1000

answer

GOF5eMC_CH04_q06. What will be the value of bonus after the following code is executed?

question

0.0

answer

GOF5eMC_CH04_q07. What would be the value of discountRate after the following statements are executed?

question

Relational

answer

GOF5eMC_CH04_q09. ________ operators are used to determine whether a specific relationship exists between two values.

question

0.04

answer

GOF5eMC_CH04_q10. What would be the value of discountRate after the following statements are executed?

question

str1.equalsIgnoreCase(str2)

answer

GOF5eMC_CH04_q11. Which of the following expressions could be used to perform a case-insensitive comparison of two String objects named str1 and str2?

question

The code contains an error and will not compile.

answer

GOF5eMC_CH04_q14. What is the value of ans after the following code has been executed?

question

braces.

answer

GOF5eMC_CH04_q15. A block of code is enclosed in a set of

question

The code contains an error and will not compile.

answer

GOF5eMC_CH04_q16. What will be displayed after the following code has been executed?

question

answer

GOF5eMC_CH04_q18. What will be displayed when the following code is executed?

question

true or false.

answer

GOF5eMC_CH04_q19. The boolean expression in an if statement must evaluate to

question

true or false.

answer

GOF5eMC_CH04_q20. A flag may have the values

question

chrA != 'A'

answer

GOF5eMC_CH04_q22. Which of the following expressions determines whether the char variable chrA is not equal to the letter 'A'?

question

a block of statements.

answer

GOF5eMC_CH04_q23. Enclosing a group of statements inside a set of braces creates

question

flag

answer

GOF5eMC_CH04_q25. A ________ is a boolean variable that signals when some condition exists in the program.

question

x <= y

answer

GOF5eMC_CH04_q26. Which of the following expressions will determine whether x is less than or equal to y?

question

answer

GOF5eMC_CH04_q27. The ________ statement is used to create a decision structure, which allows a program to have more than one path of execution.

question

Unicode number

answer

GOF5eMC_CH04_q28. When a character is stored in memory, it is actually the ________ that is stored.

question

a set of parentheses.

answer

GOF5eMC_CH04_q29. Java requires that the boolean expression being tested by an if statement be enclosed in

question

if (temp >= 0 && temp <= 100)

answer

GOF5eMC_CH04_q30. Which of the following statements determines whether temp is within the range of 0 through 100?

question

'True'.

answer

GOF5eTF_CH04_q01. An important style rule you should adopt for writing if statements is to write the conditionally executed statement on the line after the if statement.

question

'True'.

answer

GOF5eTF_CH04_q02. The if-else statement will execute one group of statements if its boolean expression is true, or another group if its boolean expression is false.

question

'True'.

answer

GOF5eTF_CH04_q04. A local variable's scope always ends at the closing brace of the block of code in which it is declared.

question

'True'.

answer

GOF5eTF_CH04_q05. Unicode is an international encoding system that is extensive enough to represent all the characters of all the world's alphabets.

question

'True'.

answer

GOF5eTF_CH04_q06. All it takes for an OR expression to be true is for one of the subexpressions to be true.

question

'False'.

answer

GOF5eTF_CH04_q08. When two strings are compared using the String class's compareTo method, the comparison is case-insensitive.

question

'True'.

answer

GOF5eTF_CH04_q10. If the expression on the left side of the ;; operator is false, the expression on the right side will not be checked.

question

Tree.PINE

answer

GOF5eMC_CH06_q29. Look at the following declaration: What is the fully-qualified name of the PINE enum constant?

question

"Has a"

answer

GOF5eMC_CH06_q07. ________ is the term for the relationship created by object aggregation.

question

This is a public method that accepts a Stock object as its argument and returns a boolean value.

answer

GOF5eMC_CH06_q15. If the following is from the method section of a UML diagram, which of the following statements is true?

question

only one copy of the field in memory.

answer

GOF5eMC_CH06_q27. When a field is declared static, there will be

question

SavingsAccount.getNumberOfAccounts();

answer

GOF5eMC_CH06_q03. 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?

question

Class, Responsibilities, Collaborations.

answer

GOF5eMC_CH06_q23. CRC stands for

question

aggregate

answer

GOF5eMC_CH06_q19. 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."

question

it must be the first statement in the constructor making the call.

answer

GOF5eMC_CH06_q13. When the this variable is used to call a constructor

question

null.

answer

GOF5eMC_CH06_q17. By default, a reference variable that is an instance field is initialized to the value

question

True

answer

GOF5eTF_CH06_q09. When an object is passed as an argument, it is actually a reference to the object that is passed.

question

True

answer

GOF5eTF_CH06_q05. An instance of a class does not have to exist in order for values to be stored in a class's static fields.

question

True

answer

GOF5eTF_CH06_q01. The key word this is the name of a reference variable that an object can use to refer to itself.

question

having two or more methods with the same name, but different signatures.

answer

GOF5eMC_CH06_q09. Overloading is

question

the method name and the parameter list.

answer

GOF5eMC_CH06_q11. A method's signature consists of

question

procedural programming, object-oriented programming

answer

GOF5eMC_CH01_q01. Whereas ________ is centered on creating procedures, ________ is centered on creating objects.

question

Semicolons

answer

GOF5eMC_CH01_q22. ________ are used to indicate the end of a Java statement.

question

'True'.

answer

GOF5eTF_CH01_q02. The Java Virtual Machine is a program that reads Java byte code instructions and executes them as they are read.

question

symbolic names made up by the programmer that represents locations in the computer's RAM.

answer

GOF5eMC_CH01_q09. Variables are

question

are highly portable.

answer

GOF5eMC_CH01_q13. Because Java byte code is the same on all computers, compiled Java programs

question

procedural and object-oriented.

answer

GOF5eMC_CH01_q04. The two primary methods of programming in use today are

question

read and interpreted by the JVM.

answer

GOF5eMC_CH01_q15. Byte code instructions are

question

'True'.

answer

GOF5eTF_CH01_q07. Encapsulation refers to the combining of data and code into a single object.

question

answer

GOF5eMC_CH01_q27. How many bits are in a byte?

question

object

answer

GOF5eMC_CH01_q19. A(n) ________ is a software entity that contains data and procedures.

question

make sure you are in the same directory or folder where the MyClass.java file is located.

answer

GOF5eMC_CH01_q06. Suppose you are at an operating system command line, and you are going to use the following command to compile a program: Before entering the command, you must

question

Pseudocode

answer

GOF5eMC_CH01_q14. ________ is a cross between human language and a programming language.

question

a set of instructions that enable the computer to solve a problem or perform a task.

answer

GOF5eMC_CH01_q25. A computer program is

question

'False'.

answer

GOF5eTF_CH01_q08. Java source files end with the .class extension.

question

data hiding

answer

GOF5eMC_CH01_q12. A characteristic of ________ is that only an object's methods are able to directly access and make the changes to the object's data.

question

'True'.

answer

GOF5eTF_CH01_q01. Logical errors are mistakes that cause the program to produce erroneous results.

question

the methods that operate on the data.

answer

GOF5eMC_CH01_q07. An object typically hides it data, but allows outside code to access

question

java ReadIt

answer

GOF5eMC_CH01_q02. Which of the following commands will run the compiled Java program named ReadIt?

question

'False'.

answer

GOF5eTF_CH01_q03. Colons are used to indicate the end of a Java statement.

question

words that have a special meaning in the programming language.

answer

GOF5eMC_CH01_q17. Key words are

question

Rules that must be followed when writing a program.

answer

GOF5eMC_CH01_q23. What is syntax?

question

attributes.

answer

GOF5eMC_CH01_q30. The data contained in an object is known as

question

true or false.

answer

GOF5eMC_CH02_q11. The boolean data type may contain the following range of values:

question

with only a format string, and no additional arguments.

answer

GOF5eMC_CH02_q29. The simplest way you can use the System.out.printf method is

question

showMessageDialog

answer

GOF5eMC_CH02_q27. The ________ method is used to display a message dialog.

question

'True'.

answer

GOF5eTF_CH02_q07. The Java API provides a class named Math, which contains numerous methods that are useful for performing complex mathematical operations.

question

nextLine

answer

GOF5eMC_CH02_q25. Which Scanner class method reads a String?

question

'True'.

answer

question

data type.

answer

GOF5eMC_CH02_q09. Variables are classified according to their

question

System.out.println("Hello, world");

answer

GOF5eMC_CH02_q15. To print "Hello, world" on the monitor, use the following Java statement:

question

8.0

answer

GOF5eMC_CH02_q07. What will be the value of z after the following statements have been executed?

question

x = 27, y = 3, z = 18

answer

GOF5eMC_CH02_q21. What will be displayed after the following statements have been executed?

question

(asterisk)/ Comment 2 /(asterisk)

answer

GOF5eMC_CH02_q01. Which of the following is not a valid Java comment?

question

5.0

answer

GOF5eMC_CH02_q23. What will be the value of z as a result of executing the following code?

question

There are 5785 (tab)hens in the hen house.

answer

GOF5eMC_CH02_q17. What would be displayed as a result of the following code?

question

Variable

answer

GOF5eMC_CH02_q13. This is a named storage location in the computer's memory.

question

'True'.

answer

GOF5eTF_CH02_q03. A variable's scope is the part of the program that has access to the variable.

question

'True'.

answer

GOF5eTF_CH02_q09. The System.out.printf method allows you to format output in a variety of ways.

question

'True'.

answer

GOF5eTF_CH02_q01. Programming style includes techniques for consistently putting spaces and indentation in a program so visual cues are created.

question

single quotes, double quotes

answer

GOF5eMC_CH02_q05. Character literals are enclosed in ________, and string literals are enclosed in ________.

question

Nothing. There is an error in the code.

answer

GOF5eMC_CH02_q19. What will be the displayed when the following code is executed?

question

Literal

answer

GOF5eMC_CH02_q03. This is a value that is written into the code of a program.

question

instance fields.

answer

GOF5eMC_CH03_q01. When an object is created, the attributes associated with the object are called

question

using the private access specifier on the class fields.

answer

GOF5eMC_CH03_q03. Data hiding, which means that critical data stored inside the object is protected from code outside the object, is accomplished in Java by

question

package.

answer

GOF5eMC_CH03_q05. A group of related classes is called a(n)

question

in order to avoid having stale data.

answer

GOF5eMC_CH03_q07. You should not define a class field that is dependent upon the values of other class fields

question

answer

GOF5eMC_CH03_q09. In UML diagrams, what symbol indicates that a member is public?

question

instance.

answer

GOF5eMC_CH03_q11. Another term for an object of a class is a(n)

question

Write the code.

answer

GOF5eMC_CH03_q13. Which of the following is not involved in finding the classes when developing an object-oriented application?

question

performs initialization or setup operations.

answer

GOF5eMC_CH03_q15. A constructor is a method that

question

fields private.

answer

GOF5eMC_CH03_q17. It is common practice in object-oriented programming to make all of a class's

question

import

answer

GOF5eMC_CH03_q19. You use this key word to import a class.

question

an explicit import statement

answer

GOF5eMC_CH03_q21. What is the following statement an example of?

question

a wildcard import statement

answer

GOF5eMC_CH03_q23. What is the following statement an example of?

question

class.

answer

GOF5eMC_CH03_q25. One or more objects may be created from a(n)

question

has the same name as the class.

answer

GOF5eMC_CH03_q27. A constructor

question

answer

GOF5eMC_CH03_q29. A UML diagram uses the ________ symbol to indicate that a member is private.

question

'True'.

answer

GOF5eTF_CH03_q01. An access specifier indicates how the class may be accessed.

question

'True'.

answer

GOF5eTF_CH03_q03. The term "no-arg constructor" is applied to any constructor that does not accept arguments.

question

'False'.

answer

GOF5eTF_CH03_q05. The public access specifier for a field indicates that the field may not be accessed by statements outside the class.

question

'True'.

answer

GOF5eTF_CH03_q07. 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.

question

'True'.

answer

GOF5eTF_CH03_q09. The java.lang package is automatically imported into all Java programs.

question

both the things a class is responsible for knowing and the things a class is responsible for doing

answer

GOF5eMC_CH03_q02. A class's responsibilities include

question

instance methods.

answer

GOF5eMC_CH03_q04. Methods that operate on an object's fields are called

question

methods

answer

GOF5eMC_CH03_q06. Class objects normally have ________ that perform useful operations on their data, but primitive variables do not.

question

objects

answer

GOF5eMC_CH03_q08. 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.

question

a public method with a parameter of data type double that does not return a value

answer

GOF5eMC_CH03_q10. What does the following UML diagram entry mean?

question

a volatile type of memory, used only for temporary storage.

answer

GOF5eMC_q03. RAM is usually

question

determine if the program solves the original problem.

answer

GOF5eMC_q05. The purpose of validating the results of the program is to

question

Hardware

answer

GOF5eMC_q11. ________ refers to the physical components that a computer is made of.

question

the programs that make the computer useful to the user.

answer

GOF5eMC_q21. Application software refers to

question

Programming language

answer

GOF5eMC_q29. This is a special language used to write computer programs.

question

100

answer

GOF5eMC_CH05_q01. What will be the value of x after the following code is executed?

question

posttest

answer

GOF5eMC_CH05_q03. This type of loop will always be executed at least once.

question

sentinel

answer

GOF5eMC_CH05_q05. A ________ is a value that signals when the end of a list of values has been reached.

question

import java.io.*;

answer

GOF5eMC_CH05_q07. When working with the PrintWriter class, which of the following import statements should you have near the top of your program?

question

answer

GOF5eMC_CH05_q09. How many times will the following do-while loop be executed?

question

FileWriter fwriter = new FileWriter("MyFile.txt", true); PrintWriter outFile = new PrintWriter(fwriter);

answer

GOF5eMC_CH05_q11. Which of the following statements opens a file named MyFile.txt and allows you to append data to its existing contents?

question

answer

GOF5eMC_CH05_q13. What will be the value of x after the following code is executed?

question

the File class's exists method

answer

You can use this method to determine whether a file exists.

question

Nothing. The code contains a syntax error.

answer

GOF5eMC_CH05_q19. What does the following code do?

question

File file = new File("MyFile.txt"); Scanner inputFile = new Scanner(file);

answer

GOF5eMC_CH05_q23. Which of the following statements opens a file named MyFile.txt and allows you to read data from it?

question

an infinite loop.

answer

GOF5eMC_CH05_q25. If a loop does not contain within itself a way to terminate, it is called

question

sentinel

answer

GOF5eMC_CH05_q27. A(n) ________ is a special value that cannot be mistaken as a member of a list of data items and signals that there are no more data items from the list to be processed.

question

accumulator.

answer

GOF5eMC_CH05_q29. The variable used to keep the running total is called a(n)

question

posttest

answer

GOF5eMC_q03. This type of loop will always be executed at least once.

question

sentinel

answer

GOF5eMC_q05. A ________ is a value that signals when the end of a list of values has been reached.

question

the File class's exists method

answer

GOF5eMC_q15. You can use this method to determine whether a file exists.

question

The code contains a syntax error.

answer

GOF5eMC_q19. What does the following code do?

question

accumulator

answer

GOF5eMC_q29. The variable used to keep the running total is called a(n)

question

sentinel

answer

GOF5eMC_q27. A(n) ________ is a special value that cannot be mistaken as a member of a list of data items and signals that there are no more data items from the list to be processed.

question

str1.equals(str2)

answer

GOF5eMC_CH04_q01. If str1 and str2 are both String objects, which of the following expressions will correctly determine whether or not they are equal?

question

braces

answer

GOF5eMC_CH04_q15. A block of code is enclosed in a set of

question

"000.0"

answer

GOF5eMC_CH04_q17. Which of the following strings could be passed to the DecimalFormat constructor to display 12.78 as 012.8?

question

true or false.

answer

GOF5eMC_CH04_q19. The boolean expression in an if statement must evaluate to

question

300.0

answer

GOF5eMC_CH04_q21. What will be displayed after the following statements are executed?

question

a block of statements.

answer

GOF5eMC_CH04_q23. Enclosing a group of statements inside a set of braces creates

question

flag

answer

GOF5eMC_CH04_q25. A ________ is a boolean variable that signals when some condition exists in the program.

question

answer

GOF5eMC_CH04_q27. The ________ statement is used to create a decision structure, which allows a program to have more than one path of execution.

question

a set of parentheses.

answer

GOF5eMC_CH04_q29. Java requires that the boolean expression being tested by an if statement be enclosed in

question

'True'.

answer

GOF5eTF_CH04_q01. An important style rule you should adopt for writing if statements is to write the conditionally executed statement on the line after the if statement.

question

'False'.

answer

GOF5eTF_CH04_q03. In a switch statement, if two different values for the CaseExpression would result in the same code being executed, you must have two copies of the code, one after each CaseExpression.

question

'True'.

answer

GOF5eTF_CH04_q05. Unicode is an international encoding system that is extensive enough to represent all the characters of all the world's alphabets.

question

'True'.

answer

GOF5eTF_CH04_q07. The DecimalFormat class is part of the Java API, but it is not automatically available to your programs.

question

'False'.

answer

GOF5eTF_CH04_q09. When testing for character values, the switch statement does not test for the case of the character.

question

1+1

answer

666 CH4

question

true

answer

In a for loop, the control variable can only be incremented.

question

Set the accumulator where the total will be kept to an initial value, usually zero

answer

Before entering a loop to compute a running total, the program should first

question

x = 17, y = 4

answer

What will be the values of x and y as a result of the following code? nt x = 12, y = 5; x += y- -;

question

false

answer

When the break statement is encountered in a loop, all the statements in the body of the loop that appear after it are ignored, and the loop prepares for the next iteration.

question

false

answer

In the for loop, the control variable cannot be initialized to a constant value and tested against a constant value.

question

Counter-controlled loop

answer

A loop that repeats a specific number of times is known as a(n) ________.

question

Running total

answer

This is a sum of numbers that accumulates with each iteration of a loop

question

Delimiter

answer

This is an item that separates other items.

question

true

answer

When you open a file with the PrintWriter class, the class can potentially throw an IOException.

question

An infinite loop

answer

If a loop does not contain within itself a way to terminate, it is called

question

int number = inputFile.nextInt();*****

answer

Assuming that inputFile references a Scanner object that was used to open a file, which of the following statements will read an int from the file?

question

Conditional loop

answer

A loop that executes as long as a particular condition exists is called a(n) ________.

question

All of the above**

answer

A for loop normally performs which of these steps?

question

answer

What will be the value of x after the following code is executed? int x = 10; for (int y = 5; y < 20; y +=5) x += y;

question

false

answer

The do-while loop is a pre-test loop.

question

true

answer

The do-while loop must be terminated with a semicolon.

question

It is a sentinel

answer

Look at the following code: Scanner keyboard = new Scanner(System.in); int studentGrade = 0; int totalOfStudentGrades = 0; while(studentGrade != -1) { System.out.println("Enter student grade: :"); studentGrade = keyboard.nextInt(); totalOfStudentGrades += studentGrade; } In the loop header: while(studentGrade != -1), what is the purpose of "-1"

question

Sentinel

answer

This is a value that signals when the end of a list of values has been reached.

question

false

answer

When the break statement is encountered in a loop, all the statements in the body of the loop that appear after it are ignored, and the loop prepares for the next iteration.

question

answer

How many times will the following do-while loop be executed? int x = 11; do { x += 20; } while (x <= 100);

question

x = 33, y = 9

answer

What will be the values of x and y as a result of the following code? int x = 25, y = 8; x += y++;

question

This is an infinite loop

answer

What will be the value of x after the following code is executed? int x = 10, y = 20; while (y < 100) { x += y; }

question

answer

How many times will the following do-while loop be executed? int x = 11; do { x += 20; } while (x > 100);

question

for loop

answer

This type of loop is ideal in situations where the exact number of iterations is known.

question

File file = new File("MyFile.txt"); Scanner inputFile = new Scanner(file);

answer

Which of the following will open a file named MyFile.txt and allow you to read data from it?

question

2+2

answer

666 CH4

question

true

answer

The expression in a return statement can be any expression that has a value.

question

true

answer

No statement outside the method in which a parameter variable is declared can access the parameter by its name.

question

All of the above are benefits

answer

Which of the following is not a benefit derived from using methods in programming?

question

void

answer

This type of method performs a task and then terminates.

question

true

answer

Constants, variables, and the values of expressions may be passed as arguments to a method.

question

Declared in the method header inside the parentheses

answer

When an argument value is passed to a method, the receiving parameter variable is

question

true

answer

A value-returning method can return a reference to a non-primitive type.

question

The @return tag

answer

To document the return value of a method, use this in a documentation comment.

question

displayValue(a,b); // where a is a short and b is a long

answer

Given the following method header, which of the method calls would be an error? public void displayValues(double x, int y)

question

Appear after the general description of the method

answer

All @param tags in a method's documentation comment must

question

true

answer

Any method that calls a method with a throws clause in its header must either handle the potential exception or have the same throws clause.

question

All of the above are benefits

answer

Which of the following is not a benefit derived from using methods in programming?

question

Actually a reference to the object that is passed

answer

When an object, such as a String, is passed as an argument, it is

question

true

answer

A parameter variable's scope is the method in which the parameter is declared.

question

semicolon

answer

Which of the following is not a part of the method header?

question

true

answer

No statement outside the method in which a parameter variable is declared can access the parameter by its name.

question

A void method

answer

In the following code, System.out.println(num), is an example of ________. double num = 5.4; System.out.println(num); num = 0.0;

question

Method body

answer

This part of a method is a collection of statements that are performed when the method is executed.

question

The data type of the return value

answer

The header of a value-returning method must specify this.

question

all of the above

answer

Breaking a program down into small manageable methods

question

true

answer

You must have a return statement in a value-returning method.

question

The data type of the argument x should not be included in the method call

answer

What is wrong with the following method call? displayValue (double x);

question

The last line of code will cause an error

answer

What will be the result of the following code? int num; string str = "555"; num = Integer.parseInt(string str) + 5;

question

showProduct(10, 4.5);

answer

Which of the following would be a valid method call for the following method? public static void showProduct (int num1, double num2) { int product; product = num1 * (int)num2; System.out.println("The product is " + product); }

question

showProduct(3.3, 55);

answer

Which of the following would be a valid method call for the following method? public static void showProduct(double num1, int num2) { double product; product = num1 * num2; System.out.println("The product is " + product); }

question

@param tag

answer

When writing the documentation comments for a method, you can provide a description of each parameter by using a

question

3+3

answer

666 CH6

question

true

answer

Instance methods do not have the key word static in their headers.

question

(1) String str = new String("Hello, world"); (2) String str = "Hello, world"; ==Both 1 and 2

answer

Which of the following statements will create a reference, str, to the string, "Hello, world"?

question

fields private

answer

It is common practice in object-oriented programming to make all of a class's

question

instance

answer

Another term for an object of a class is a(n)

question

class

answer

One or more objects may be created from a(n)________.

question

Encapsulation

answer

This refers to the combining of data and code into a single object.

question

String str = "Hello, World";

answer

Which of the following statements will create a reference, str, to the String, "Hello, World"?

question

There is no value because the object order has not been created

answer

Given the following code, what will be the value of finalAmount when it is displayed? public class Order { private int orderNum; private double orderAmount; private double orderDiscount; public Order(int orderNumber, double orderAmt, double orderDisc) { orderNum = orderNumber; orderAmount = orderAmt; orderDiscount = orderDisc; } public int getOrderAmount() { return orderAmount; } public int getOrderDisc() { return orderDisc; } } public class CustomerOrder { public static void main(String[] args) { int ordNum = 1234; double ordAmount = 580.00; double discountPer = .1; Order order; double finalAmount = order.getOrderAmount() — order.getOrderAmount() * order.getOrderDisc(); System.out.println("Final order amount = $" + finalAmount); } }

question

java.lang

answer

The following package is automatically imported into all Java programs.

question

the instance methods of the same class

answer

The scope of a private instance field is

question

A wildcard import

answer

Look at the following statement. import java.util.*; This is an example of

question

The variable name followed by a colon and the data type

answer

In a UML diagram to indicate the data type of a variable enter

question

instance fields

answer

When an object is created, the fields associated with the object are called

question

Class name; fields; methods

answer

In your textbook the general layout of a UML diagram is a box that is divided into three sections. The top section has the _________; the middle section holds _________; the bottom section holds _________.

question

true

answer

A constructor is a method that is automatically called when an object is created.

question

fields private

answer

It is common practice in object-oriented programming to make all of a class's

question

java.lang

answer

The following package is automatically imported into all Java programs

question

Braces, {}

answer

After the header, the body of the method appears inside a set of

question

object names

answer

A UML diagram does not contain ________.

question

This is a public method with a parameter of data type double and does not return a value

answer

What does the following UML diagram entry mean? + setHeight(h : double) : void

question

answer

In UML diagrams, this symbol indicates that a member is public.

question

Both A and B

answer

A class's responsibilities include

question

y is available to code that is written outside the Circle class

answer

For the following code, which statement is not true? public class Circle { private double radius; public double x; private double y; }

question

4+4

answer

666 Java CH 2

Combo with "CIS 283 Final" and 1 other – Flashcards

Unlock all answers in this set

Haven't found what you were looking for?

Search for samples, answers to your questions and flashcards