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AP Practice Test - Multiple Choice

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

 1. 
int [ ] [ ] nums = new int [5] [5];  //assume nums is filled with zeroes
int z =0;
for (int x = 1; x < nums.length; x+=2){
  for (int y = 1; y < nums.length; y++){
       z++;
       if (z>9) z =1;
       nums[y][x] = z;
  }
}
Which of the following represents what the nums array will look like?
a.
00000
01050
02060
03070
04080
c.
00000
01234
00000
05678
00000
b.
00000
01594
02615
03726
04837
d.
00000
01234
05678
09123
04567
 

 2. 
Consider the following class:

public class Clock {
private int hours;
private int mins;

public Clock(int h, int m)
{
  hours = h;
  mins = m;
}

//moves this clock one minute forward
public void move()
{
  //missing code
}
public void set(int h, int m)
{
  hours = h;
  mins = m;
  normalize();
}
private void normalize()
{
  while(mins >=60)
    {
      mins -= 60;
      hours++;
    }
  hours %= 12;
}
}

Which of the following could replace <missing code> in the move method?

Option I.    mins++;
                 mins%60;

Option II.   mins++;
                 normalize( );

Option III. set(hours, mins + 1);
a.
All of Above
d.
I only
b.
II only
e.
III only
c.
II and III
 

 3. 
What is the output of the following?

public class Person
{
String name;
public Person(String nm) { name = nm;}
public String getName() {return name;}
public String toString() {return getName();}
}

-----------------------------------------------------------------
public class OldLady extends Person
{
private int age;
public OldLady(String nm, int yrs)
{
super(nm);
age = yrs;
}

public String getName() 
{
return "Mrs. " + super.getName();
}

public int getAge()
{
return age;
}
}
-----------------------------------------------------------------
public class OldLadyRunner {
public static void main(String[] args) {
OldLady o = new OldLady("Robinson", 92);
System.out.println(o + ", " + o.getAge());
}
}

a.
Mrs. Robinson, 92
c.
Robinson
b.
Robinson, 92
d.
Error:   ClassCastException
 

 4. 
int n = 12;
System.out.print( calculate(n));
System.out.print(" " + n);

public static double calculate(int n)
{
n %=7;
return (double) (12/n);
}

What is the output of this program?
a.
2.0 5
c.
2.4 6
b.
2.4 12
d.
2.0 12
 

 5. 
What is the name of the law that states:

!( a && b)   is the same as     !a | | !b
a.
deMorgan’s Law
d.
Newton’s Law
b.
Avogadro’s Law
e.
Archimede’s Law
c.
Boyle’s Law
 

 6. 
This program is supposed to randomly choose a letter of the alphabet.  Any letter of the alphabet can be chosen with equal probability.  Consider the following code segment with a missing statement:

String abc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  // MISSING STATEMENT
System.out.println(abc.substring((k, k+1));

Which of the following can replace //MISSING STATEMENT for the code to work properly?
a.
int k = Math.random(0,25);
d.
int k = Math.random(25);
b.
int k = (int) (26*Math.random( ));
e.
int k = Math.random(26) - 1;
c.
int k =Math.random(25) + 1;
 

 7. 

public class Party {
private ArrayList <String> theGuests;
public Party(){theGuests=null;}
public Party(ArrayList<String> guests){theGuests=guests;}
public void setGuests(ArrayList <String> guests) { theGuests=guests;}
public String toString()
{
/* code not shown */
}

public class BDayParty extends Party
{
private String theName;
public BDayParty(String name, ArrayList<String> guests)
{
/* code not shown */
}
public String getName() {return theName;}
}

public static void main(String[] args) {
ArrayList<String> guests = new ArrayList<String>();
guests.add("Alice");
guests.add("Ben");
guests.add("Candy");
//Add code here
}
}

Which of the following declarations is NOT valid, when added to the main method?
a.
Party [ ] celebrations = new Party(guests), new Party( )};
b.
BdayParty[ ] celebrations = {new BDayParty(“Lee:, guests), new BDayParty(“Henry”, guests>};
c.
BDayParty [ ] celebrations = new BDayParty(“Malika”, guests), new Party(guests)};
d.
All of the above are valid.
e.
Party[ ] celebrations = new Party[2];
 

 8. 
Consider the following method:

public int locate(String str, String oneLetter)
{
  int j =0;
  while(j < str.length() && str.substring(j, j+1).compareTo(oneLetter) < 0)
    {
      j++;
    }
  return j;
}

Which of the following must be true when the while loop terminates?
a.
j == str.length( ) && str.substring(J, j+1).compareTo(oneLetter) >= 0
d.
j == str.length()
b.
j <= str.length( ) | | str.substring(J, j+1).compareTo(oneLetter) > 0
e.
str.substring(j, j+1) >=0
c.
j == str.length( ) | | str.substring(J, j+1).compareTo(oneLetter) >= 0
 

 9. 
What is the output for the following program?

int [ ] nums = new int [5];
  for (int x = 0; x < nums.length; x++)
    {
          nums[x] = (int) Math.pow(2, x) % 5;   
          System.out.print(nums[x]);
    }
a.
12431
c.
22222
b.
14410
d.
24312
 

 10. 
Which of the following expressions will be true when x and y  are boolean variables with different values?

Option I.     ( x || y) && (!x || !y)
Option II.    (x || y) && !(x && y)
Option III.   (x && !y) || (!x && y)
a.
I only
d.
I and II only
b.
I, II, and III
e.
II only
c.
II and III only
 

 11. 
Which of the following code segments will move Actor andy south to the adjacent grid cell, assuming the new Location is valid and empty?

Option I.    loc = andy.getLocation( );
                 loc.setRow(loc.get() + 1);

Option II.   loc = andy.getLocation();
                 Location newLoc = new Location(loc.getRow() + 1, loc.getCol());
                 andy.setLocation(newLoc);

Option III.  loc = andy.getLocation();
                 andy.moveTo(loc.getAdjacentLocation(Location.SOUTH));
a.
I and II only
d.
III only
b.
I only
e.
II and III only
c.
II only
 

 12. 
Suppose you wanted to create an Employee class.

One of the data fields would be the boss data field, which would hold the name of the employee’s boss.  If everyone had the same boss, which of the follow would be the best way to declared the boss data field?
a.
final String boss;
d.
private String boss;
b.
static String boss;
e.
String boss;
c.
public String boss;
 

 13. 
int x = 2;
int y = 3;
int z = 0;
while(z < 100){
z += (int) Math.pow(x, y);
}
System.out.println(z);

What is the output?
a.
96
c.
108
b.
99
d.
104
 

 14. 
In the GridWorld design, why is the Actor class not made abstract, with the act method abstract?
a.
To avoid duplication of the setColor method in Actor’s subclasses
d.
To enable polymorphism for instances of Actor
b.
To be able to override the act method in Actor’s subclasses
e.
To avoid dupliction of code in constructors of Actor’s subclasses
c.
To be able to create Actor objects in GridWorld applications and explore their attributes and behaviors.
 

 15. 
Consider the following interface and class:

public interface Student
{
  double getGPA();
  int getSemesterUnits();
}

public class FullTimeStudent implements Student
{
  //Required methods go here
}

What is the minimum set of methods that a develop must implement in order to successfully compile the FullTimeStudent class?
a.
No methods would need to be implemented
b.
getGPA( ), getSemesterUnits( )
c.
getGPA( ), getSemesterUnits( ), equals (Object s)
d.
getGPA( ), getSemesterUnits( ), equals(Object s), toString()
 

 16. 
public class Counter {
private int count = 0;

public Counter(){count = 0;}
public Counter(int x){count = x;}//line 1
public int getCount() {return count;}//line 2
public void setCount(int c){int count = c;}//line 3
public void increment(){count++;}//line 4
public String toString(){return "" + count;}//line 5

public static void main (String [] args)
{
Counter c= new Counter();
c.setCount(3);
c.increment();
System.out.println(c.getCount());
}
}

This class is supposed to output 4, but has an error.  What is actually printed, and which line in the above class should be changed to get the correct output of 4?
a.
1, line 3
d.
3, line 4
b.
0, line 4
e.
36, line 5
c.
0, line 1
 

 17. 
How does a Bug (default)  act if it is located in the northeast corner of a bounded grid and is facing north when the step button is clicked?
a.
The Bug turns northwest
d.
The Bug turns west
b.
The Bug turns northeast
e.
The Bug turns south
c.
The Bug is removed from the grid
 



 
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