Pre AP CompSci Final Exam

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Multiple Choice
Identify the choice that best completes the statement or answers the question.

Which of the following are Java integer data types?

a.	byte, short, integer and longInteger	c.	byteInt, shortInt, int and longInt
b.	shortInt, int and longInt	d.	byte, short, int and long

Which of the following is not a common binary arithmetic operator for real numbers?

a.	+
b.	-
c.	*
d.	%
e.	/

The expression ++q will ____________ execute the same as the expression q++.

a.	always	c.	sometimes
b.	never	d.	always (provided that q is an int data type)

What is the output of the following program statement?

int q = 10;
System.out.print(q + " ");
q += 20;
System.out.println(q);
q *= 5;

a.	30 150	c.	10 30
b.	10 30 150	d.	1020

What is the output of the program segment below?

int age = 25;
String firstName = "John";
String lastName = "Doe";
System.out.println(firstName + "\n" + lastName + "\n" + age);

a.	JohnDoe25	c.	John Doe 25
b.	John Doe 25	d.	Error Message

Which of the following programming features is/are part of Object Oriented Programming?

a.	Encapsulation	c.	Class interaction
b.	Polymorphism	d.	All of the above

Object Oriented Programming

a.	makes programs more reliable.	c.	uses a lot of intimidating vocabulary, which is not as bad as it sounds.
b.	simulates real life.	d.	does all of the above.

What is the value of result in the following statement?

int result = Math.pow(-2,2);

a.	-4.0
b.	-0.25
c.	0.25
d.	4.0
e.	NaN

What is the value of result in the following statement?

int result = Math.floor(9.999999);

a.	10	c.	9
b.	9.999999	d.	Error Message

10.

Assume that a and b are non-equal integers.
What is the value of result in the following statement?

int result = Math.sqrt(Math.min(a,b)-Math.max(b,a));

a.	-25.0
b.	-5.0
c.	5.0
d.	25.0
e.	NaN

11.

Assume you have an 800 by 600 applet window and that g is an object of the Graphics class.
Which of the following commands will draw a diagonal line from the top-left corner to the bottom-right corner?

a.	g.drawLine(0,0,799,599);
b.	g.drawLine(0,0,599,799);
c.	g.drawLine(0,799,0,599);
d.	g.drawLine(799,599,0,0);
e.	Both A and D

12.

Assume you have an 800 by 600 applet window and that g is an object of the Graphics class.
Which of the following program segments will make the entire applet window red?

a.	g.setColor(Color.red); g.drawRect(0,0,800,600);
b.	g.setColor(Color.red); g.drawRect(0,0,600,800);
c.	g.setColor(Color.red); g.fillRect(0,0,800,600);
d.	g.setColor(Color.red); g.fillRect(800,600,0,0);
e.	g.setColor(Color.red); g.fillRect(0,0,600,800);

13.

The drawOval method uses the exact same parameters as what 3 other method(s)?

a.	fillOval	c.	fillRect
b.	drawRect	d.	All of the above

14.

Which of the following sentences can be translated into a conditional statement?

a.	Tomorrow is the start of the second semester.	c.	Your SAT score should be 1250.
b.	If you are a national merit finalist, you will receive a scholarship.	d.	Go straight to jail; do not pass go; do not collect any money.

15.

What is the output of the following program segment?

double bonus = 500.0;
double sales = 300000.0;
if (sales >= 300000.0)
bonus += 250.0;
System.out.println("Bonus: " + bonus);
System.out.println("The End");

a.	Bonus: 50.0 The End	c.	Bonus: 750.0 The End
b.	Bonus: 500.0 The End	d.	No output

16.

What is the output of the following program segment?

int k = 100;
k /=3;
if (k < 30)
{
      k++;
      k = k % 5;
}
else
{
      k--;
      k = k % 5;
}
System.out.println("k = "+k);

a.	k = 0
b.	k = 1
c.	k = 2
d.	k = 30
e.	k = 32

17.

What is the value of num at the conclusion of the following program segment?

char qwerty = 'B';
int num = 100;
switch(qwerty)
{
      case 'A': num ++; break;
      case 'B': num += 2;
      case 'C': num += 3; break;
      case 'D': num += 4;
}

a.	100
b.	102
c.	105
d.	109
e.	Error message

18.

The do..while loop structure uses what kind of Repetition?

a.	pre-condition	c.	fixed
b.	post-condition	d.	multi-condition

19.

What is the output of the following program segment?

for (int k = 0; k <= 10; k+=3)
System.out.println("What is OOP?");

a.	What is OOP? What is OOP? What is OOP? What is OOP? What is OOP? What is OOP?
b.	What is OOP? What is OOP? What is OOP? What is OOP? What is OOP?
c.	What is OOP? What is OOP? What is OOP? What is OOP?
d.	What is OOP?
e.	No Output

20.

What is the output of the following program segment?

int j;
j = 25;
while (j > 2)
{
j/=2;
System.out.print(j + " ");
}

a.	25 12 6 3
b.	25 13 7 4 2
c.	25 12 6 3 1
d.	12 6 3 1
e.	12 6 3

21.

drawPolygon & fillPolygon are both methods of the _______ class.

a.	Math
b.	Random
c.	DecimalFormat
d.	Polygon
e.	Graphics

22.

nextInt & nextDouble are both methods of which classes?

a.	Math and Random	d.	Polygon and Graphics
b.	Random and Scanner	e.	Graphics and Scanner
c.	DecimalFormat and Color

23.

What can you determine from the source code of a program that displays random numbers
if this line is near the top of the file?

Random rand = new Random(12345);

a.	The output will be the same every time you execute the program.
b.	The output will be different every time you execute the program.
c.	You cannot determine anything without seeing the program.

24.

Look at this program segment:

Random rand = new Random();
System.out.println(rand.nextInt(901)+100);

What is the range of numbers that can be displayed by this program segment?

a.	100..901	c.	100..1000
b.	100..999	d.	100..1001

25.

Which of the following program segments generates a random integer in the range [1000 . . . 9999] ?

a.	int range = 9999 - 1000 + 1; *int randInt = (int) Math.random() range + 1000;**
b.	int range = 9999 - 1000 + 1; *int randInt = (int) (Math.random()) range + 1000;**
c.	*int randInt = (int) (Math.random() 9999) + 1000;**
d.	int range = 9999 - 1000 + 1; *int randInt = (int) (Math.random() range) + 1000;**

26.

What is the output of the following program?

      public class Q61
      {
                 public static void main(String args [ ])
                 {
                    method1();
                    method2();
                    method3();

}

                public static void method1()   { System.out.println("Calling method 1"); }

                public static void method2()   { System.out.println("Calling method 2"); }

                public static void method3()   { System.out.println("Calling method 3"); }
      }

a.	Calling method 1 Calling method 2 Calling method 3
b.	Calling method 3 Calling method 2 Calling method 1
c.	Calling method 1 Calling method 3 Calling method 2
d.	Error message

27.

Which of the following method headings uses proper parameter declarations?

a.	public static void guess(double rate, double hours, int deductions);
b.	public static void guess(double rate, hours, int deductions);
c.	public static void guess(rate, hours, deductions);
d.	public static void guess(7.85, 42.5, 3);

28.

The parameters in the method call and the method heading must be the same

I.       quantity.
II.       sequence.
III.       type.

a.	I only
b.	II only
c.	I & II only
d.	II & III only
e.	I, II & III

29.

In a java file which class must be declared public?

a.	Every class that is contained in the file.	c.	Only the class with the same name as the file.
b.	Only the class or classes that must be accessed from outside the file.	d.	Only the first class in the file.

30.

What is the output of the following program?

      public class Q69
      {
                 public static void main(String args [ ])
                 {
                    int x = 25;
                    int y = 10;
                    System.out.println(x + " + " + y + " = " + Calc.add(x,y));
                    System.out.println(x + " - " + y + " = " + Calc.sub(x,y));
                    System.out.println(x + " * " + y + " = " + Calc.mul(x,y));
                    System.out.println(x + " / " + y + " = " + Calc.div(x,y));
                }
      }

      class Calc
      {
                public static int add(int p, int q)
                {
                    int result = p + q;
                    return result;
                }

                public static int sub(int p, int q)
                {
                    int result = p - q;
                    return result;
                }

                public static int mul(int p, int q)
                {
                    return p * q;
                }

                public static int div(int p, int q)
                {
                    return p / q;
                }
      }

a.	25 + 10 25 - 10 25 * 10 25 / 10
b.	25 + 10 = 35 25 - 10 = 15 25 * 10 = 250 25 / 10 = 2
c.	35 15 250 2
d.	Error message

31.

What is the essence of encapsulation?

a.	Declare data attributes in a class as private.
b.	Declare data attributes in a class as public.
c.	Package the data and the methods that access that data inside the same class.
d.	Package all the data in one class and all the methods in another class.
e.	None of the above

32.

What is the output of the following program?

public class Q77
{
      public static void main(String args [ ])
      {
            Q77.method(1);
            Q77.method(3);
            Q77.method(2);
      }

      public static void method(int n)
      {
            System.out.println("Calling method " + n);
      }
}

a.	Calling method 1 Calling method 2 Calling method 3
b.	Calling method 3 Calling method 2 Calling method 1
c.	Calling method 1 Calling method 3 Calling method 2
d.	Error Message

33.

Which of the following method declarations can be a constructor?

I.
public static Qwerty()
{
      start = 0;
      max = 1000;
}

II.
public Qwerty()
{
      start = 0;
      max = 1000;
}

III.
public Qwerty(int s, int m)
{
      start = s;
      max = m;
}

IV.
public void Qwerty()
{
      start = 0;
      max = 1000;
}

V.
public int Qwerty(int s, int m)
{
      start = s;
      max = m;
}

a.	I only
b.	II only
c.	III only
d.	II & III only
e.	IV and V only

34.

A private method

I.       can only be accessed by methods of the same class.
II.       is usually a helper method.
III.       can never be a constructor.

a.	I only
b.	II only
c.	III only
d.	I & II only
e.	I, II & III

35.

Class interaction is the process of

a.	using classes in the established standard Java Language library.	c.	combining data and the methods, which process the data, inside the same module.
b.	using features from an existing class.	d.	dividing a program into multiple related files for each class in the program.

36.

Consider the following class heading.

public class Person extends Student

What is not true about the class interaction of that class heading?

a.	It indicates an "is-a" class interaction between the two classes.	c.	It indicates that Person is the superclass and Student is the subclass.
b.	It indicates an inheritance relationship between Person and Student	d.	It indicates that Student is the superclass and Person is the subclass.

37.

Consider the following method, which is defined in the Student class and the Person class.
Assume that the Student class is a subclass of the Person class.

public void showData()
{
System.out.println(getData());
System.out.println( super.getData());
}

What is printed when method showData is called?

a.	Two identical values	c.	The value of the subclass getData followed by the value of the superclass getData
b.	A compile error message	d.	The value of the superclass getData followed by the value of the subclass getData

38.

What method/field tells you how many elements are in a Java static array?

a.	The length method	c.	The size method
b.	The length field	d.	The size field

39.

What is the output of this program segment:

int list[] = new int[10];
for (int j = 0; j < 10; j++)
System.out.print( list[j] );

a.	0
b.	0000000000
c.	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
d.	10 unknown numbers
e.	Error

40.

What is the output of this program segment:

int list[] = new int[10];
for (int j = 0; j < 10; j++)
      if (j == j)
            list[j] = 7
      else
            list[j] = 0;

for (int j = 0; j < 10; j++)
      System.out.print( list[j] );

a.	7000000000
b.	0700000000
c.	0000000070
d.	0000000007
e.	7777777777