Question 1

What is the function of the dot operator?

Accepted Answer

A)  It serves to separate the integer portion from the fractional portion of a floating-point number. 
B)  It allows one to access the data within an object when given a reference to the object. 
C)  It allows one to invoke a method within an object when given a reference to the object. 
D)  It is used to terminate commands, similar to the way a period terminates a sentence in English. 
E)  Both B and C are correct. 
A)  It serves to separate the integer portion from the fractional portion of a floating-point number. 
B)  It allows one to access the data within an object when given a reference to the object. 
C)  It allows one to invoke a method within an object when given a reference to the object. 
D)  It is used to terminate commands, similar to the way a period terminates a sentence in English. 
E)  Both B and C are correct. E

Question 2

What is autoboxing?

Accepted Answer

Autoboxing provides automatic conversions between primitive values and corresponding wrapper objects. It makes your code shorter by relieving you of the need to provide explicit wrapping of primitive values and explicit extraction of primitive values.

Question 3

Which statement is true, given the following code fragment? String strA = "aBcDeFg";
String strB = strA.toLowerCase();
StrB = strB.toUpperCase();
String strC = strA.toUpperCase();

Accepted Answer

A)  strB.equals(str
C)  would be true 
B)  strB.compareTo(str
C)  would yield 0 
C)  strA.equals(str
C)  would be true 
D)  strA.compareTo(str
C)  would yield 0 
E)  None of these 
A)  strB.equals(str
C)  would be true 
B)  strB.compareTo(str
C)  would yield 0 
C)  strA.equals(str
C)  would be true 
D)  strA.compareTo(str
C)  would yield 0 
E)  None of these B

Question 4

In a development environment that fully supports JavaFX, which of the following is true?

Accepted Answer

A)  The launch method of the scene class is called automatically. 
B)  The launch method of the Application class is called automatically. 
C)  Since the launch method is called automatically, you do not need to write the main method. 
D)  Since the launch method is called automatically, you do not need to call it in the main method. 
E)  Both B and C are true 
A)  The launch method of the scene class is called automatically. 
B)  The launch method of the Application class is called automatically. 
C)  Since the launch method is called automatically, you do not need to write the main method. 
D)  Since the launch method is called automatically, you do not need to call it in the main method. 
E)  Both B and C are true

Question 5

Write a declaration for a Rectangle named squareShape that is 400 pixels wide, 400 pixels high, and its upper-left corner position is at point (50, 50).

Accepted Answer

A)  Rectangle squareShape = new squareShape(50, 50, 400, 400); 
B)  squareShape = new Rectangle(50, 50, 400, 400); 
C)  Rectangle squareShape = new Rectangle(50, 400, 50, 400); 
D)  Rectangle squareShape = new Rectangle(50, 50, 400, 400); 
E)  Rectangle = new squareShape(400, 400, 50, 50); 
A)  Rectangle squareShape = new squareShape(50, 50, 400, 400); 
B)  squareShape = new Rectangle(50, 50, 400, 400); 
C)  Rectangle squareShape = new Rectangle(50, 400, 50, 400); 
D)  Rectangle squareShape = new Rectangle(50, 50, 400, 400); 
E)  Rectangle = new squareShape(400, 400, 50, 50);

Question 6

An API is

Accepted Answer

A)  an Abstract Programming Interface 
B)  an Application Programmer's Interface 
C)  an Application Programming Interface 
D)  an Abstract Programmer's Interface 
E)  an Absolute Programming Interface 
A)  an Abstract Programming Interface 
B)  an Application Programmer's Interface 
C)  an Application Programming Interface 
D)  an Abstract Programmer's Interface 
E)  an Absolute Programming Interface

Question 7

An alias is when

Accepted Answer

A)  two different reference variables refer to the same physical object 
B)  two different numeric variables refer to the same physical object 
C)  two different numeric variables contain identical values 
D)  two variables have the same name 
E)  None of these 
A)  two different reference variables refer to the same physical object 
B)  two different numeric variables refer to the same physical object 
C)  two different numeric variables contain identical values 
D)  two variables have the same name 
E)  None of these

Question 8

The names of the wrapper classes are just the names of the primitive data types, but with an initial uppercase letter.

Accepted Answer

A) True 
 B)False

Question 9

Write a statement to create a Color object equivalent to Color.ORANGE using the rgb method.

Accepted Answer

Color oran

Question 10

What happens if you attempt to use a variable before it has been initialized?

Accepted Answer

A)  A syntax error may be generated by the compiler. 
B)  A run-time error may occur during execution. 
C)  A "garbage" or "uninitialized" value will be used in the computation. 
D)  A value of zero is used. 
E)  Only answers A and B are correct. 
A)  A syntax error may be generated by the compiler. 
B)  A run-time error may occur during execution. 
C)  A "garbage" or "uninitialized" value will be used in the computation. 
D)  A value of zero is used. 
E)  Only answers A and B are correct.

Question 11

These two ways to set up a String will yield identical results:
String my_string = new String("123.45");
String my_string = "" + 123.45;

Accepted Answer

A) True 
 B)False

Question 12

These two ways to set up a String will yield identical results:
String my_string = "12345";
String my_string = 12345;

Accepted Answer

A) True 
 B)False

Question 13

Given two String variables, s1 and s2, is it possible for (s1 != s2)to be true while (s1.equals(s2)) is also true? Why or why not?

Accepted Answer

The condition (s1 != s2) means that s1 a

Question 14

These two ways to set up a String will yield identical results:
String my_string = new String(12345);
String my_string = new String("12345");

Accepted Answer

A) True 
 B)False

Question 15

Problem Ch 03-1
Assume an interactive Java program which asks the user for his/her first name and last name, and outputs the user's initials.
-Refer to Problem Ch 03-1. Write a statement to guarantee that the initial will be a capital letter.

Accepted Answer

firstIniti

Question 16

The String class's compareTo method

Accepted Answer

A)  compares two strings in a case-independent manner 
B)  yields true or false 
C)  yields 0 if the two strings are identical 
D)  rerturns 1 if the first string comes lexically before the second string 
E)  None of these 
A)  compares two strings in a case-independent manner 
B)  yields true or false 
C)  yields 0 if the two strings are identical 
D)  rerturns 1 if the first string comes lexically before the second string 
E)  None of these

Question 17

Why is it often a good idea to group particular elements together in a scene?

Accepted Answer

This makes it much easier to a

Question 18

Which of the following will yield a pseudorandom number in the range [-5, +5), given: Random gen = new Random();

Accepted Answer

A)  gen.nextFloat()*5 
B)  gen.nextFloat()*10-5 
C)  gen.nextFloat()*5-10 
D)  gen.nextInt()*10-5 
E)  gen.nextInt(10)-5 
A)  gen.nextFloat()*5 
B)  gen.nextFloat()*10-5 
C)  gen.nextFloat()*5-10 
D)  gen.nextInt()*10-5 
E)  gen.nextInt(10)-5

Question 19

Which is now the preferred approach for developing Java programs that use graphics and GUIs?

Accepted Answer

A)  Swing 
B)  AWT 
C)  JavaFX 
D)  API 
E)  All of these are preferred approaches 
A)  Swing 
B)  AWT 
C)  JavaFX 
D)  API 
E)  All of these are preferred approaches

Question 20

Problem Ch 03-1
Assume an interactive Java program which asks the user for his/her first name and last name, and outputs the user's initials.
-Refer to Problem Ch 03-1. Write a statement using a Scanner method to get the first name interactively.

Accepted Answer

firstName

What is the function of the dot operator?

What is autoboxing?

Which statement is true, given the following code fragment? String strA = "aBcDeFg"; String strB = strA.toLowerCase(); StrB = strB.toUpperCase(); String strC = strA.toUpperCase();

In a development environment that fully supports JavaFX, which of the following is true?

Write a declaration for a Rectangle named squareShape that is 400 pixels wide, 400 pixels high, and its upper-left corner position is at point (50, 50).

An API is

An alias is when

The names of the wrapper classes are just the names of the primitive data types, but with an initial uppercase letter.

Write a statement to create a Color object equivalent to Color.ORANGE using the rgb method.

What happens if you attempt to use a variable before it has been initialized?

These two ways to set up a String will yield identical results: String my_string = new String("123.45"); String my_string = "" + 123.45;

These two ways to set up a String will yield identical results: String my_string = "12345"; String my_string = 12345;

Given two String variables, s1 and s2, is it possible for (s1 != s2)to be true while (s1.equals(s2)) is also true? Why or why not?

These two ways to set up a String will yield identical results: String my_string = new String(12345); String my_string = new String("12345");

Problem Ch 03-1 Assume an interactive Java program which asks the user for his/her first name and last name, and outputs the user's initials. -Refer to Problem Ch 03-1. Write a statement to guarantee that the initial will be a capital letter.

The String class's compareTo method

Why is it often a good idea to group particular elements together in a scene?

Which of the following will yield a pseudorandom number in the range [-5, +5), given: Random gen = new Random();

Which is now the preferred approach for developing Java programs that use graphics and GUIs?

Problem Ch 03-1 Assume an interactive Java program which asks the user for his/her first name and last name, and outputs the user's initials. -Refer to Problem Ch 03-1. Write a statement using a Scanner method to get the first name interactively.

Introduction

Data and Expressions

Writing Classes

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Polymorphism

Exceptions

Recursion

Collections

Filters

Exam 3: Using Classes and Objects

What is the function of the dot operator?

What is autoboxing?

Which statement is true, given the following code fragment? String strA = "aBcDeFg"; String strB = strA.toLowerCase(); StrB = strB.toUpperCase(); String strC = strA.toUpperCase();

In a development environment that fully supports JavaFX, which of the following is true?

Write a declaration for a Rectangle named squareShape that is 400 pixels wide, 400 pixels high, and its upper-left corner position is at point (50, 50).

An API is

An alias is when

The names of the wrapper classes are just the names of the primitive data types, but with an initial uppercase letter.

Write a statement to create a Color object equivalent to Color.ORANGE using the rgb method.

What happens if you attempt to use a variable before it has been initialized?

These two ways to set up a String will yield identical results: String my_string = new String("123.45"); String my_string = "" + 123.45;

These two ways to set up a String will yield identical results: String my_string = "12345"; String my_string = 12345;

Given two String variables, s1 and s2, is it possible for (s1 != s2)to be true while (s1.equals(s2)) is also true? Why or why not?

These two ways to set up a String will yield identical results: String my_string = new String(12345); String my_string = new String("12345");

Problem Ch 03-1 Assume an interactive Java program which asks the user for his/her first name and last name, and outputs the user's initials. -Refer to Problem Ch 03-1. Write a statement to guarantee that the initial will be a capital letter.

The String class's compareTo method

Why is it often a good idea to group particular elements together in a scene?

Which of the following will yield a pseudorandom number in the range [-5, +5), given: Random gen = new Random();

Which is now the preferred approach for developing Java programs that use graphics and GUIs?

Problem Ch 03-1 Assume an interactive Java program which asks the user for his/her first name and last name, and outputs the user's initials. -Refer to Problem Ch 03-1. Write a statement using a Scanner method to get the first name interactively.

Introduction

Data and Expressions

Writing Classes

Conditionals and Loops

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Polymorphism

Exceptions

Recursion

Collections

Filters