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COMP 328 Week 4 Midterm Exam
COMP 328 Final Exam.
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COMP 328 Final Exam (Devry)
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COMP 328
Java Exam
Select the best answer.
1: The .class extension on a file means that the file
a.contains Java source code.
b.contains HTML.
c.is produced by the Java compiler (javac).
d.contains a machine specific executable image.
2: Which command compiles the Java source code file
Welcome.java?
a.cd Welcome.java
b.javac Welcome.java
c.java Welcome.java
d.compile Welcome.java
3: A(n) ________ enables a program to read data from the user.
a.printf
b.import declaration
c.Scanner
d.main routine
4: Which of the following is a Scanner method?
a.nextLine
b.nextText
c.nextWord
d.readNext
5: Every Java application is required to have
a. at least one public static method.
b.at least one data member.
c. a String variable which holds the name of the application.
d.a content pane and several GUI components.
6: Which of the following statements about creating arrays and
initializing their elements is false?
a. The new keyword should be used to create an array.
b. When an array is created, the number of elements must be
placed in square brackets following the type of element being
stored.
c. The elements of an array have unknown values just after the
array has been created.
d. A for loop is an excellent way to initialize the elements of an
array.
7: Assume the following class declaration.
class MyClass
{
int a;
String q;
public void firstMethod()
{
int b, ;
* 7;
+ c * a;
}
}
Mark the following statements as TRUE or FALSE.
q is a reference variable which refers to the empty string.
__TRUE___ b and c are local variables. ___TRUE____ a, b,
and c are primitive data types. ___FALSE____ MyClass is a
Java application. ___FALSE____
8: Which statement below could be used to randomly select a
state from an array which contains exactly 50 strings which are
the names of the states?
1 + ( int ) ( Math.random( ) * 49 ); ( int ) ( Math.random( ) *
51 ); ( int ) ( Math.random( ) * 50 ); 1 + ( int ) ( Math.random( )
* 50 );
9: To draw a single line from (0, 15) to (20, 25), call the method
_________ of the Graphics class in the paintComponent
method.
a.drawLine( 0, 15, 20, 25 );
b.drawString( "single line", 0, 15 );
c.drawLine( 0, 15, 20, 10 );
d.drawLine( 15, 0, 25, 20 );
10: In the Java graphics system, coordinate units are measured
in ________.
a.dots
b.pixels
c.points
d.inches
11: Which is a correct way to invoke the static method sqrt of
the Math class?
a.sqrt( 900 );.
b.math.sqrt( 900 );.
c.Math.sqrt( 900 );.
d.Math Math(); math.sqrt( 900 );.
12: When an object is concatenated with a String
a.a compilation error occurs.
b.a runtime error occurs.
c.the object’s toString method is implicitly called to obtain the
String representation of the object.
d.the object’s class name is used.
13: What do the following statements do?
double array[];
double[ 14 ];
a. Creates a double array containing 13 elements.
b.Creates a double array containing 14 elements.
c. Creates a double array containing 15 elements.
d. Declares but does not create a double array.
14: Consider the class below:
public class Test
{
public static void main( String args[] )
{
int a[];
int[ 10 ];
for ( int ; i <a.length; i++ )
a[ i ] = i + 1 * 2;
int ;
for ( int ; i <a.length; i++ )
result += a[ i ];
System.out.printf( "Result is: %d\n", result );
} // end main
} // end class Test
The output of this Java program will be
a. Result is: 62
b. Result is: 64
c. Result is: 65
d. Result is: 67
15: Which method call converts the value in variable
stringVariable to an integer?
a. Convert.toInt( stringVariable )
b. Convert.parseInt( stringVariable )
c. Integer.parseInt( stringVariable )
d.Integer.toInt( stringVariable )
16: Which of the following is the method used to display a
dialog box to gather input?
a. showMessageDialog
b. getInput
c. inputDialog
d. showInputDialog
17: provides the basic attributes and behaviors of a window—a
title bar at the top of the window, and buttons to minimize,
maximize and close the window.
a. JLabel
b. JFrame
c. JSwing
d. JWindowControl
18: Which of the following does not generate an event?
a. Typing in a text field.
b. Clicking on a button.
c. Viewing the text in a label.
d. Moving the mouse.
19: When the user presses Enter in a JTextField, the GUI
component generates an , which is processed by an object that
implements the interface .
a. ActionEvent, ActionListener
b. ActionEvent, ActionEventListener
c. TextEvent, TextListener
d. TextEvent, TextEventListener
202: When the user clicks a JCheckBox, a(n) occurs.
a. CheckedEvent
b. ButtonEvent
c. ItemEvent
d. ActionEvent
21: Which method determines if a JRadioButton is selected?
a. isSelected
b. getSelected
c. selected
d. none of the above
22: The logical relationship between radio buttons is
maintained by objects of what class?
a. MutualExclusionGroup
b. RadioButtonGroup
c. Group
d. ButtonGroup
23: Which layout manager is the default for JPanel?
a. FlowLayout
b. BorderLayout
c. GridLayout
d. none of the above
24. A Java interface
a. must contain only public abstract methods.
b. can be implemented by any number of Java classes.
c. reference can refer to objects of any class which implements
the interface.
d. all of the above
25. Writing an application which handles mouse events can be
done by
a. having a GUI class implement the KeyListener interface.
b. creating an inner class which extends the MouseAdapter
class.
c. adding mouse functionality to the paintComponent method.
d. all of the above
26. Write a Java statement using printf to output the value of
Math.PI, showing 5 digits after the decimal point.
27. Write a Java statement that declares a class called
MyDrawingPanel that inherits from the JPanel class. Do not
declare any methods or member variables in this class.
28. Class Cap has been defined as a base class, and class
BaseballCap inherits from class Cap. Is the following Java
statement legal? Explain why or why not.
29. Write a few lines of code that would place 2 radio buttons
labeled on and off side by side into the top part of a JFrame
based window. Assume that the code you are writing is inside
the constructor of an application which inherits from JFrame.
Declare any variables that you need. You should only need 6-8
lines of code.
30. This Java application is supposed to do the following. There
are 2 text fields for user input. The first is used to input a
voltage value. The second is used to input a resistance value in
ohms. All values are floating point values. The user clicks a
button to perform a calculation. One button causes the program
to calculate and display the current flowing through the resistor,
/ R. Another button causes the program to calculate the power
being dissipated by the resistor, * V. The result of the selected
calculation is displayed in a single output text area. The output
string should say something like this: “10 volts dropped across
1000 ohms creates 0.1 amps.” Clicking of a button generates
the event which causes the program to do the selected
calculation and update the output area. The user interface has
already been setup in the class that follows. Your job is to
implement the ButtonHandler nested inner class which handles
button events, does the requested calculation and displays the
appropriate result.
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COMP 328 Week 1 lab 1 (Devry)
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COMP 328 Week 1 lab 2.
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COMP 328 Week 4 Midterm Exam (Devry)
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COMP-328
MIDTERM
1. What is UNIX?
a. Operating System
b. Company
c. Programming Language
2. Which company originally developed UNIX?
a. NASA
b. Novel
c. AT&T (BELL)
d. Apple
e. IBM
3. What is UNIX Shell?
a. A game
b. A command-line interpreter
c. A hardware
d. A text editor
4. Which command will display a Calendar?
a. cal
b. dis cal
c. view Cal
d. calendar
5. Which command can be used to display the contents of a file
on the screen?
a. ls
b. grep
c. dog
d. cat
6.
To list the permissions on files, which of the following
commands will work?
a. ls
b. ls –a
c. ls –l
d. more –al
7. The ________ command will display the absolute pathname
for the directory that you are wokring in.
a. dir
b. whereami
c. pwd
d. ls
8. To change access modes on files you can use the chmod
command.
a. True
b. False
9. What does a Java class contain that identifies it as a Java
application?
10. How are static methods different from non-static methods?
How do you invoke a static method? Give an example of a static
method.
11. Explain the difference between an object reference in Java
and an object. Use an example to illustrate your answer.
12.
Explain how objects are created in Java and how the
memory used by objects is recovered.
13. How do you get the first character of a string in Java?
How do you access the last character of a string? Use Java code
to illustrate your answer.
14. How would you write an expression in Java to generate a
random integer value between 100 and 200, where the numbers
100 and 200 were both included in the set of possible numbers
that could be generated?
16. What is the difference between throwing an exception and
catching an exception?
17. Explain the difference between a checked exception and an
unchecked exception.
18. What happens if an exception does not have a matching
catch block?
19. What can your program do with the exception object that a
catch block receives?
20. What is the purpose of the finally block?
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COMP 328 Week 6 lab 6.