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Name:_______________________
Covers chs9-17
Final Exam
CSCI 1302 Introduction to Programming
Armstrong Atlantic State University
Instructor: Dr. Y. Daniel Liang
Please note that the university policy prohibits giving the exam score by email. If you need to know your
final exam score, come to see me during my office hours next semester.
I pledge by honor that I will not discuss the contents of this exam with
anyone.
Signed by ___________________ Date ___________________
1. a (3pts)
Suppose that statement2 may cause an exception in the following statement:
try {
}
finally {
statement5;
}
statement6;
Answer the following questions:
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b. (5 pts)
Given the following code:
public class Test {
public static void main(String[] args) {
1. Show the output from running Test using the Circle class in (a).
2. Show the output from running Test using the Circle class in (b).
3. If Object is replaced by Circle in the Test class, what would be the output to run Test using
c. (2 pts)
In the preceding question, if circle1.equals(circle2) in the Test class is replaced by
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2. Design and use interfaces (10 pts)
Write a class named Octagon that extends GeometricObject
and implements the Comparable and Cloneable interfaces.
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3. Design and create GUI applications (10 pts)
Write a JavaFX GUI program to add two numbers from text fields, and
displays the result in a non–editable text field. A sample run of
the program is shown in the following figure.
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4. Text I/O (10 pts)
Write a program that will count the number of characters (excluding
control characters ‘\r’ and ‘\n’), words, and lines, in a file. Words
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5. Multiple Choice Questions: (1 pts each)
(1. Mark your answers on the sheet. 2. Login and click Take
Instructor Assigned Quiz for QFinal. 3. Submit it online
within 5 mins. 4. Close the Internet browser.)
1. _________ describes the state of an object.
a. data fields
b. methods
c. constructors
d. none of the above
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2. An attribute that is shared by all objects of the class is coded
using ________.
a. an instance variable
b. a static variable
c. an instance method
d. a static method
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4. If a class named Student has a constructor Student(String name)
defined explicitly, the following constructor is implicitly provided.
a. public Student()
b. protected Student()
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5. Suppose the xMethod() is invoked in the following constructor in
a class, xMethod() is _________ in the class.
public MyClass() {
xMethod();
}
a. a static method
b. an instance method
c. a static method or an instance method
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6. Suppose the xMethod() is invoked from a main method in a class as
follows, xMethod() is _________ in the class.
public static void main(String[] args) {
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xMethod();
}
a. a static method
b. an instance method
c. a static or an instance method
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7. What would be the result of attempting to compile and
run the following code?
public class Test {
static int x;
public static void main(String[] args){
System.out.println(“Value is ” + x);
}
}
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8. Analyze the following code:
public class Test {
private int t;
public static void main(String[] args) {
Test test = new Test();
System.out.println(test.t);
}
}
a. The variable t is not initialized and therefore causes errors.
b. The variable t is private and therefore cannot be accessed in the
main method.
c. Since t is an instance variable, it cannot appear in the static
main method.
d. The program compiles and runs fine.
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9. Suppose s is a string with the value “java”. What will be
assigned to x if you execute the following code?
char x = s.charAt(4);
a. ‘a’
b. ‘v’
c. Nothing will be assigned to x, because the execution causes the
runtime error StringIndexOutofBoundsException.
d. None of the above.
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public static void main(String[] args) {
int[] x = new int[3];
System.out.println(“x[0] is “+x[0]);
}
}
a. The program has a syntax error because the size of the array
wasn’t specified when declaring the array.
b. The program has a runtime error because the array elements are
not initialized.
c. The program runs fine and displays x[0] is 0.
d. None of the above.
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11. How can you get the word “abc” in the main method from the
following call?
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12. Which code fragment would correctly identify the number of
arguments passed via the command line to a Java application,
excluding the name of the class that is being invoked?
a. int count = args.length;
b. int count = args.length – 1;
c. int count = 0; while (args[count] != null) count ++;
d. int count=0; while (!(args[count].equals(“”))) count ++;
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13. Show the output of running the class Test in the following code
lines:
interface A {
void print();
}
class C {}
class B extends C implements A {
public void print() { }
}
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a. Nothing.
b. b is an instance of A.
c. b is an instance of C.
d. b is an instance of A followed by b is an instance of C.
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14. When you implement a method that is defined in a superclass, you
__________ the original method.
a. overload
b. override
c. copy
d. call
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15. What modifier should you use on a variable so that it can only be
referenced inside its defining class.
a. public
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16. What is the output of running class C?
class A {
public A() {
System.out.println(
“The default constructor of A is invoked”);
}
}
class B extends A {
public B() {
System.out.println(
“The default constructor of B is invoked”);
}
}
public class C {
public static void main(String[] args) {
B b = new B();
}
}
a. none
b. “The default constructor of B is invoked”
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17. Analyze the following program.
class Test {
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public static void main(String[] args) {
try {
String s = “5.6”;
Integer.parseInt(s); // Cause a NumberFormatException
int i = 0;
int y = 2 / i;
System.out.println(“Welcome to Java”);
}
catch (Exception ex) {
System.out.println(ex);
}
}
}
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18. What is displayed on the console when running the following
program?
class Test {
public static void main(String[] args) {
try {
System.out.println(“Welcome to Java”);
int i = 0;
int y = 2/i;
}
}
}
a. The program displays Welcome to Java three times followed by End
of the block.
b. The program displays Welcome to Java two times followed by End of
the block.
c. The program displays Welcome to Java three times.
d. The program displays Welcome to Java two times.
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19. To append data to an existing file, use _____________ to construct a
FileOutputStream for file out.dat.
a. new FileOutputStream(“out.dat”)
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20. After the following program is finished, how many bytes are written to the
file t.dat?
import java.io.*;
public class Test {
public static void main(String[] args) throws IOException {
DataOutputStream output = new DataOutputStream(
new FileOutputStream(“t.dat”));
output.writeShort(1234);
output.writeShort(5678);
output.close();
}
}
a. 2 bytes.
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