True/False
Indicate whether the sentence or statement is true
or false.
|
|
|
1.
|
Consider the following code:
String doItAgain = “y”;
while
(doItAgain.equals(“y”) ){
System.out.print(“\nEnter degrees Fahrenheit: “);
thermo.setFahrenheit(reader.nextDouble());
// Consume the trailing
newline
reader.nextLine();
System.out.println(“The equivalent
in Celsius is “ +
thermo.getCelsius());
System.out.print(“\nDo it again (y/n)?
“);
doItAgain =
reader.nextLine();
}
If the user
enters an uppercase “Y” when prompted, the loop will repeat.
|
|
|
2.
|
In a
menu-driven program in which the menu is repeatedly displayed, the menu should contain an option that
allows the user to quit the program.
|
|
|
3.
|
One
advantage of a menu-driven program is that you do not need to error-check the user’s menu
choice.
|
|
|
4.
|
When
printing the value of a double variable, the methods print and
println always display all of the decimal digits.
|
|
|
5.
|
Consider the following code:
double
dollars = 25;
double tax
= dollars * 0.125;
System.out.println(“Income: $” + dollars);
System.out.println(“Tax owed:
$” + tax);
The values
printed by the output statements would appear in a standard monetary format (two-decimal places of
precision).
|
|
|
6.
|
A
format string is a combination of literal string information and formatting
information.
|
|
|
7.
|
In a
format specifier code, a letter is used to specify the format type.
|
|
|
8.
|
In a
printf statement, a format specifier in the format string and the
corresponding expression must match in position and type.
|
|
|
9.
|
When
creating a table, it is not important for all of the values in a column to be justified in the same
manner.
|
|
|
10.
|
In a
table, a data value is right-justified when its display begins in the leftmost column of its
field.
|
|
|
11.
|
The
format specifier %6.2f says to use a precision of 6 digits and a field of 2 columns when displaying
the floating-point number.
|
|
|
12.
|
The
String class’s format method takes the same arguments as the printf method.
|
|
|
13.
|
In a
try-catch statement, all of the code within the try block will always be executed.
|
|
|
14.
|
Consider the following code segment:
Scanner reader = new
Scanner(System.in);
Thermometer thermo = new
Thermometer();
while (true)
try{
System.out.print(“\nEnter degrees Fahrenheit: “);
thermo.setFahrenheit(reader.nextDouble());
break;
}catch(Exception
e){
System.out.println(“Error in number format!”);
reader.nextLine();
}
The try-catch block in this code segment is equipped to catch any type
of exception that might occur in the try block.
|
|
|
15.
|
A
program that uses dialog box I/O forces the user to respond to a rigid sequence of pop-up prompts for
data.
|
Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
|
|
|
16.
|
Which
of the following terms is not associated with handling repeating sets of input? a. | count-controlled | c. | query-controlled | b. | input-controlled | d. | sentinel-controlled | | | | |
|
|
|
17.
|
Java
5.0 includes the method ____ for formatting output. a. | print | c. | printf | b. | println | d. | printFormatted | | | | |
|
|
|
18.
|
Format specifier codes begin with the ____ character.
|
|
|
19.
|
The
____ format type code in a format specifier would denote a decimal integer value.
|
|
|
20.
|
The
____ format type code in a format specifier would denote a fixed floating-point
value.
|
|
|
21.
|
The
____ format type code in a format specifier would denote an exponential floating-point
value.
|
|
|
22.
|
The
____ format type code in a format specifier would denote a string value.
|
|
|
23.
|
Consider the following code:
int idNum = 758;
double wage = 10.5;
printf(“The wage for employee %d is $%.2f per hour.”,
idNum, wage);
The output of the printf statement would
be ____. a. | The wage for
employee 10.50 is $758 per hour. | b. | The wage for employee 758 is $10.50 per
hour. | c. | The wage for employee 758 is $10.5 per
hour. | d. | The wage for employee 758.00 is $10 per
hour. | | |
|
|
|
24.
|
The
____ format flag is used for left justification.
|
|
|
25.
|
The
____ format flag converts uppercase to lowercase.
|
|
|
26.
|
Which
of the following represents the proper syntax for a try-catch statement? a. | try{
<statements that might throw exceptions>
}catch{
<code to recover from an exception if
it's thrown>
} | b. | try{
<statements that might throw exceptions>
}(Exception
e){
<code to recover from an exception if it's
thrown>
} | c. | try{
<statements that might throw exceptions>
}catch(Exception e){
<code to recover from an
exception if it's thrown>
} | d. | try{
<statements that might throw exceptions>
<code to recover from an exception if it's
thrown>
} | | |
|
|
|
27.
|
Consider the following code fragment:
double temp;
Scanner reader = new Scanner(System.in);
try{
1.
System.out.print(“\nEnter degrees Fahrenheit:
“);
2. temp =
reader.nextDouble());
3. System.out.println(“\nYou
entered “ + temp);
}catch(Exception
e){
4. System.out.println(“Error
in number format!”);
}
Assuming that
the user enters a value of “200e” when prompted, which of the numbered statements would be
executed? a. | 1, 2, 3,
4 | c. | 1, 2,
4 | b. | 1, 2,
3 | d. | 1,
2 | | | | |
|
|
|
28.
|
____
classes should represent the data for a program. a. | View | c. | Controller | b. | Model | d. | Menu | | | | |
|
|
|
29.
|
The
default layout of a JFrame is a ____. a. | GridLayout | c. | FlowLayout | b. | BorderLayout | d. | No layout manager | | | | |
|
|
|
30.
|
The JTextField class’s ____ method can be used to set a text
field to be read-only. a. | setEditable | c. | setReadOnly | b. | readOnly | d. | editable | | | | |
|
Completion
Complete each sentence or
statement.
|
|
|
31.
|
In
____________________ input, before each set of inputs after the first, the program asks the user
whether there are more inputs.
|
|
|
32.
|
____________________ programs begin by displaying a list of options from which the
user selects one.
|
|
|
33.
|
The
____________________ of a floating-point number is the number of digits to the right of the decimal
point supported by the programming language.
|
|
|
34.
|
The
parameters of the method printf consist of a(n) ____________________ and one or more data
values.
|
|
|
35.
|
The
formatting information in a format string consists of one or more
____________________.
|
|
|
36.
|
The
symbol ____________________ can be used to embed an end-of-line character in a format
string.
|
|
|
37.
|
When
creating tabular output, a(n) ____________________ consists of a fixed number of columns within which
the characters of a data value can be placed.
|
|
|
38.
|
The
method printf includes several ____________________ that support the justification
of text as well as other format styles.
|
|
|
39.
|
In
general, when creating tabular output with the printf method, when the
width of the field is less than or equal to the string representation of the number, the string is
____________________-justified.
|
|
|
40.
|
The
String class’s ____________________ method can be used to build
formatted strings.
|
|
|
41.
|
In
order to detect and respond to an exception under program control so that the exception does not halt
the program, you should use a(n) ____________________ statement.
|
|
|
42.
|
The
Scanner methods nextInt and nextDouble will throw a(n)
____________________ exception if they attempt to read and parse a non-numerical value.
|
|
|
43.
|
When
using the JTextField method called ____________________, the field is read-only by the
user if the Boolean parameter b is false.
|
|
|
44.
|
____________________ classes should represent the graphical display for a GUI
program.
|
|
|
45.
|
____________________ classes are listeners that listen for events generated by the
components contained in the view classes.
|
|
|
46.
|
The
JTextField class’s ____________________ method returns the string currently
occupying the text field.
|
|
|
47.
|
Unlike programs based on terminal I/O or even dialog box I/O, real GUI programs are
____________________.
|
|
|
48.
|
The
class for a button widget that can be placed on a UI is the ____________________ class.
|
|
|
49.
|
The
class for a text label widget that can be placed on a UI is the ____________________
class.
|
|
|
50.
|
In
order to register a button widget with a specific listener class (attach a listener to the button),
you should use the ____________________ method.
|