Full Quiz Test Questions.txt

,What is the size of a double variable in Java?

,A. 2 Bytes 
,B. 4 Bytes
,C. 8 Bytes
,D. It depends on the compiler setting 
,E. It depends on the opertating System
,C
,1


,What is the output from the following code?
int x = 5 and y = 2;
System.out.println(x/y - (double)(x/y));

,A. 0
,B. 0.5
,C. -0.5
,D. -2.5
,E. None of the above
,A
,3


,What is displayed by:

System.out.println("1" + new Integer(2) + 3);

,A. The statement has a syntax error and wont't compile
,B. 6
,C. 15
,D. 123
,E. ClassCastException
,D
,3


,Consider the method:

public String mystery(String s)
{
     String s1 = s.substring(0);
     String s2 = s.substring(1);
     String s3 = s.substring(2);
     if (s.length() <= 3)
          return s3 + s2 + s1;
     else
          return s1 + mystery(s2) + s3;
}

What is the output of

System.out.println(mystery("DELIVER"));

,A. DELIVER
,B. DEVILER
,C. REVILED
,D. RELIVED
,E. DELIVERELIVERLIVERIVERRERVERERVERIVERLIVER
,E
,5


,What is the output by the code below?  

System.out.print("ab\\ab" );

What is the output of the following code segment above?
,A. abab
,B. ab
,C. ab\ab
,D. bab
,E. aba
,C
,3



,Suppose an array A has n elements.  Let's call it periodic with a period of p if 0 < p < n and A[i] == A[i+p] for all 0 <= i < n-p and p is the smallest such number.

What is the period of array v after the following code is executed?

     int v[] = new int[100];
     v[0] = 0; v[1] = 1;

     for (int i = 2; i < 100; i++)
          v[i] = v[i-1] - v[i-2];
 

What would the output be by executing the getTotal(); ?
,A. 7
,B. 6
,C. 4
,D. 45
,E. Integer.MAX_VALUE
,B
,5


,Consider the following two classes:

 public class Dog
 {
    public void act()
    {
        System.out.print("run ");
        eat();
    }
    public void eat()
    {
        System.out.print("eat ");
    }
  }
     
 public class UnderDog extends Dog
 {
    public void act()
    {
       super.act();
       System.out.print("sleep ");
    }
    public void eat()
    {
       super.eat();
       System.out.print("bark ");
    }
 }

Assume that the following declaration appears in a class other than Dog.
Dog fido = new UnderDog();

What is printed as a result of the call fido.act() ?
,A. run eat
,B. run eat sleep
,C. run eat sleep bark
,D. run eat bark sleep
,E. None of the above.
,D
,7


,What is the output of the following code?
int sum = 0
int  p = 1;
for (int count = 1; count <= 50; count++)
{
     sum += p;
     p *= 2;
}
,A. -1
,B. 562949953421311
,C. 1125899906842623 
,D. infinity due to infinte loop
,E. null
,A
,8


,A recursive method upNdown is defined as follows:
public void upNdown(int n)
{
     if (n > 1)
     {
          if (n % 2 != 0) upNdown(n+1);
          else upNdown(n/2);
          System.out.println("*");
     }
}

How many stars are displayed when upNdown(5) is called?
,A. 1
,B. 2
,C. 3
,D. 4
,E. 5
,E
,8


,The method mixup is defined as follows:

String mixup(String word)
{
     if (word.length() == 1)
          return "";
     else
          return mixup(word.substring(0)) + word.charAt(word.length() - 1);
}

What is the value of the string returned by mixup("IDEAL")?
,A. IDEAL
,B. DEAL
,C. LEAD
,D. DEAI
,E. Syntax error
,E
,9
 
,Consider the following program: 
import myLibrary.*; 


public class ShowSomeClass 
{ 
// code for the class... 
}
What is the name of the java file containing this program?

,A.myLibrary.java
,B.ShowSomeClass.java
,C.ShowSomeClass
,D.ShowSomeClass.class
,E.Any file name with the java suffix will do
,B
,2

,Which of the following is TRUE?

,A.In java; an instance field declared publicgenerates a compilation error.
,B.int is the name of a class available in the package java.lang
,C.Instance variable names may only contain letters and digits.
,D.A class has always a constructor (possibly automatically supplied by the java compiler).
,E.The more comments in a program; the faster the program runs.
,D
,2
  
,Consider the following code snippet
 
String river = new String(“Columbia”); 
System.out.println(river.length()); 


What is printed?

,A.6
,B.7
,C.8
,D.Columbia
,E.river
,C
,1 

,A constructor

,A. must have the same name as the class it is declared within.
,B. is used to create objects.
,C. may be declared private
,D. A and B
,E. A B and C
,E
,3

,Which of the following may be part of a class definition?

,A. instance variables
,B. instance methods
,C. constructors
,D. all of the above
,E. none of the above
,D
,3

,What is different between a Java applet and a Java application?

,A. An application can in general be trusted whereas an applet can't
,B. An applet must be executed in a browser environment
,C. An applet is not able to access the files of the computer it runs on
,D. (A) (B) and (C).
,E. None of the above
,D
,5

,Consider 

public class MyClass{ 
public MyClass(){/*code*/} 
// more code... 


} 
To instantiate MyClass; you would write?

,A. MyClass mc = new MyClass();
,B. MyClass mc = MyClass();
,C. MyClass mc = MyClass;
,D. MyClass mc = new MyClass;
,E. It can't be done. The constructor of MyClass should be defined as public void MyClass(){/*code*/}
,A
,2 

,What is byte code in the context of Java?

,A. The type of code generated by a Java compiler
,B. The type of code generated by a Java Virtual Machine
,C. It is another name for a Java source file
,D. It is the code written within the instance methods of a class.
,E. It is another name for comments written within a program.
,A
,1
 
,What is garbage collection in the context of Java?

,A.The operating system periodically deletes all of the java files available on the system.
,B. Any package imported in a program and not used is automatically deleted.
,C. When all references to an object are gone; the memory used by the object is automatically reclaimed.
,D.The JVM checks the output of any Java program and deletes anything that doesn't make sense.
,E. Janitors working for Sun MicroSystems are required to throw away any Microsoft documentation found in the employees' offices.
,C
,4

,You read the following statement in a Java program that compiles and executes. 
submarine.dive(depth); 


What can you say for sure?

,A. depth must be an int
,B. dive must be a method.
,C. dive must be the name of an instance field.
,D. submarine must be the name of a class
,E. submarine must be a method.
,B
,5

,Consider 
int a = 6; 
int b = 12; 
while(a<b){ 

  System.out.println("In the loop"); 

  a+=2; 
  b-=2; 

}
How many times is the phrase "In the loop" printed?

,A.1
,B.2
,C.3
,D.4
,E.5
,B
,1

,In Java; elements of an array are automatically initialized to some default value. 
What is the default value for the elements of an array of integers?

,A.0
,B."0"
,C.null
,D.1
,E.'0'
,A
,2

,You want to initialize all of the elements of a double array a to the same value equal to 1.5.What could you write? 
Assume that the array has been correctly initialized.

,A. for(int i=1; i<a.length; i++) a[i] = 1.5;
,B. for(int i=0; i<=a.length; i++) a[i] = 1.5;
,C.for(int i=0; i<a.length; i++) a[i] = 1.5;
,D.for(int i=0; i<a.length+1; i++) a[i] = 1.5;
,E.for(int i=0; i<a.length-1; i++) a[i] = 1.5;
,C
,5

,Which of the following while statements is equivalent to 
do{ 
y=x+7; 
x++; 
}while(x<9); 


(Hint: You might want to draw a flow chart to figure out the answer) 
,A. 
y=x+7; 
x++; 
while(x<9){ 
  y=x+7; 
  x++; 
} 
,B. 
while(x<9){ 
  y=x+7; 
  x++; 
} 
y=x+7; 
x++; 
,C. 
while(x<=9){ 
  y=x+7; 
  x++; 
} 

,D.A and B 
,E.A B and C
,A
,6

,Consider the code 
int[] x = {5 6 7 8 9};//Assume actual code has commas separating input instead of spaces  
int[] y = x; 
y[2] = 10; 


What is the value of x[2]?

,A.6
,B.7
,C.10
,D.8
,E.0
,C
,6

,Consider the following piece of code: 
int i; 
for(i=0; i<10; i++){ 
/* some code that doesn't modify i */ 


} 
System.out.println("i="+i); /* line A */ 


What is printed by the statement on line A?

,A.i=0
,B.i=9
,C.i=10
,D.i=11
,E.This piece of code doesn't compile since the scope of i is limited to the for loop.
,C
,6

,What is printed by the following code fragment? 

int[] a = {0 1 2 3 4 5 6};//Assume actual code has commas separating input instead of spaces

System.out.println(a.length);

,A.5
,B.6
,C.7
,D.8
,E.Can't tell. There is not enough information.
,C
,5
 
,How would you declare and initialize a palette of Color objects Array of size 6?

,A. Color palette = new Color[5];
,B. Color palette[6];
,C. Color[5] palette;
,D. Color[] palette = new Color[6];
,E. Color[] palette = new Color[5];
,D
,5
 
,The documentation of a class lists a method castToIntArray that has a double array as a formal 
parameter and returns an array of integers. What is the signature of the method?

,A. public void castToIntArray(double[] a)
,B. public [] castToIntArray(double a)
,C. public int castToIntArray(double a)
,D. public int[] castToIntArray(double[] a)
,E. public int[] castToIntArray()
,D
,6

,Which of the following is true regarding the continue statement in a for loop?

,A. continue transfers the control flow to the initialization statement of the for loop.
,B. continue transfers the control flow to the conditional statement of the for loop.
,C. continue transfers the control flow to the update statement of the for loop.
,D. continue transfers the control flow to the statement just after the for loop
,E. continue transfers the control flow to the statement just before the for loop
,C
,8

,Which of these is an actual Exception that is able to be thrown?
,A. AssetMissingException
,B. MissingPacketException
,C. FileNotFoundException
,D. CompileException
,E. NullRedistException
,C
,4

,Which of these service classes are used to read files?
,A. FileReader
,B. ArrayList
,C. Scanner
,D. BufferedReader
,E. A and D

,E
,4

,What is the main return type of the main method?
,A. String[]
,B. ArrayList<String[]>
,C. void
,D. args
,E. A and C
,C
,3

,Is it possible to make an ArrayList of ArrayLists?
,A. No - ArrayLists cannot hold ADTs (Abstract Data Types)
,B. Yes
,C. No - however you can make an ArrayList of primitive arrays
,D. Only if the ArrayList contained within the other contains a primitive data type
,E. No - ArrayLists can only store primitive data types (e.g. int or double)
,B
,2

,What does this loop print? 
for(int i = 0;i <= 5;i++)
{
	System.out.println("[" + i + "]");
}
,A. 5 Boxes with the letter "i" inside on the same line
,B. 6 boxes with the letter "i" inside on seperate lines
,C. 4 boxes with the numbers 0 through 4 on seperate lines
,D. 6 boxes with the numbers 0 through 5 on seperate lines
,E. 5 boxes with the number 0 inside on seperate lines
,D
,3

,What are different types of access modifiers in Java?
,A. Private Protected Default and Public
,B. Protected Default and Public
,C. Private Protected and Public
,D. Private Protected and Default
,E. Restricted Private and Public
,C
,5

,Which of these is not a Java IDE?
,A.Netbeans
,B.Eclipse
,C.DrJava
,D.Espresso
,E.JDeveloper
,D
,3

,What is an interface?
,A.A collection of abstract methods
,B.A system of graphic images
,C.A visual element that is able to be imported from the service class java.util.Interface
,D.A bunch of empty fields that you can enter values in
,E.A lousy outdated way of thinking
,A
,6

,What does CSV stand for?
,A.Conditional Serial Verification
,B.Comma Seperated Values
,C.Critical System Virus
,D.Constant Stack Vent
,E.Clear Source Values
,B
,3

,Which of these is a Java keyword?
,A.remove
,B.base
,C.direct
,D.root
,E.finally
,E
,4

,Which of the following is the decimal value for the following binary number?

1001011

,A.74
,B.75
,C.67
,D.150
,E.43
,B
,1

,What is the value of n after the following code is executed?

int n = 2005;
for (int i = 0; i < 50; i++)
{
     n = (n + 3) / 2;
}

,A.0
,B.1
,C.2
,D.3
,E.65
,D
,2

,Consider the following classes.

public abstract class Animal 
{
   public void run()
   {
      System.out.println("Running");
   }
}
public class Cheetah extends Animal 
{
   public void run()
   {
      System.out.println("Running really fast");
   }
}

What will be printed out when the below code segment is run?

Animal c = new Cheetah();
c.run();

,A.Running really fast
,B.Running
,C.Nothing will be printed. There will be a runtime error
,D.Running really fast
Running
,E.Running
Running really fast
,A
,3

,What is encapsulation and how does Java implement it?

,A.Encapsulation: data (fields) can be directly accessed by code in all classes. Java implements encapsulation using the visibility modifier public.
,B.Encapsulation: data (fields) can be hidden inside of an object and this can be accomplished in Java by using the abstract visibility modifier.
,C.Encapsulation: data (fields) can be hidden inside an object so that they cannot be directly altered by code in other classes. Java implements encapsulation using the visibility modifier private.
,D.Encapsulation: data (fields) are directly accessible by objects in the same package.
,E.Encapsulation: data (fields) are directly accessible by objects in the same package and in subclasses.
,C
,3

,public class Student {
  public String getFood() {
     return "Pizza";
  }
  public String getInfo()  { 
     return this.getFood(); 
  }
}

public class GradStudent extends Student {
  public String getFood() {
     return "Taco";
  }
}

What is the output from this:

Student s1 = new GradStudent();
s1.getInfo();

,A.Won't compile since you are creating a GradStudent not a Student
,B.Pizza
,C.Won't compile since you use this.getFood()
,D.Taco
,E.Won't compile since GradStudent doesn?t have a getInfo method
,D
,5

,The following method attempts to perform an insertion sort:

      public void sort() 
0:    { 
1:       for (int i = 1; i < a.length; i++) 
2:       {
3:          int next = a[i]; 

4:          // Move all larger elements to the right 
5:          int j = i; 
6:          while (j > 0 && a[j - 1] > next) 
7:          { 
8:             a[j-1] = a[j]; 
9:             j--; 
10:          } 

11:          // Insert the element 
12:          a[j] = next; 
13:       } 
14:    } 

However it does not work properly. Which is the line that contains an error?

,A. In line 1 the code i < a.length should be i < a.length ? 1.
,B. In line 5 should be int j = i + 1;
,C. In line 6 the code j > 0 should be j < i.
,D. In line 8 it should be a[j] = a[j-1];
,E. In line 1 the code should be for (int i = 0; i < a.length; i++)
,D
,5

,If a is and int array of length 2 and a[0] and a[1] holds values 7 and 13 respectively. What are their values after fun(a) is called? The method fun is defined as follows:
public void fun(int[] x)
{
     x[0] = (int)(100.0 * x[0] / (x[0] + x[1]));
     x[1] = (int)(100.0 * x[1] / (x[0] + x[1]));
}

,A.7 and 13
,B.35 and 27
,C.34 and 64
,D.35 and 65
,E.34 and 66
,B
,3

,Which of the following best describes the purpose of a method's pre and post conditions?

,A.They permit the method to be in a different file than the code which calls the method
,B.They initialize necessary variables so the method will run correctly.
,C.They explain how a method was implemented
,D.They communicate with the compiler
,E.They provide information to the programmer or reader about what the method is intended to do.
,E
,4

,What is the difference between an interface and an abstract class?


,A.An abstract class is a class that may or may not have abstract methods. Abstract classes cannot be instantiated 
and the cannot be sub-classed. An interface is a reference type. Similar to a class that can contain only constants 
and/or method signatures. There are no method bodies. Interfaces cannot be instantiated. They can only be implemented 
by classes or extended by other interfaces.
,B.An abstract class is a class that is declared abstract. it may or may not include abstract methods. Abstract 
classes cannot be instantiated. But they can be sub-classed. The subclass usually provides implementations for all of 
the abstract methods in its parent class. However if it does not; the subclass must also be declared abstract. An 
interface is a special kind of abstract class that can contain only class constants and method signatures. There are 
no method bodies allowed in methods in an interface. Interfaces cannot be instantiated. They can only be implemented 
by classes or extended by other interfaces.
,C.An abstract class is a class that is declared abstract. Abstract classes can be instantiated. But they cannot be 
sub-classed. An interface is a class that can contain only method bodies. Interfaces can be instantiated. But they 
cannot be implemented by classes or extended by other interfaces.
,D.There are no differences between an abstract class and an interface. They are both classes that can have abstract 
and non-abstract methods and there are no method bodies. Neither of them can be instantiated. But they can be 
sub-classed.
,E.An abstract class is a class that is declared abstract. It may or may not include abstract methods. Abstract classes
cannot be instantiated. But they can be sub-classed. The subclass usually provides implementations for all of the 
abstract methods in its parent class. However if it does not; the subclass must also be declared abstract. An 
interface is is class that has method bodies.
,B
,7

,What is the output of the following code?

int a = 1; 
int b = 2;
int c = 3;
a += b + c;
b += a + c;
c += a + b;
System.out.println(a + " " + b + " " + c);

,A.3 3 4
,B.3 5 6
,C.5 4 3
,D.5 8 13
,E.6 11 20
,E
,2

,What does IPO stand for in computer science?


,A. Indiana Planetary Observatory

,B. Initial Public Offering

,C. Input Processing Output

,D. International Pacific Ocean

,E. Indexed Program Object

,c
,2




,Which is not a basic concept of Object-Oriented Programming?


,A. Encapsulation

,B. Inheritance

,C. Polymorphism

,D. Extraction
,
E. Abstraction
,d

,4




,What is operator overloading?


,A. Where operators are called in till a stack-overflow error

,B. Where different operators have different implementations depending on their arguments

,C. Where a sub class implements the same method as its super class

,D. When an error occurs due to identical methods in the sub and super classes

,E. Timing out the JVM

,b

,7




,According to the Java API: Real-world objects contain _____ and _____. A software object's state is stored in _____.


,A. state. behaviour. fields.

,B. methods. code. variables.

,C. functions. processes. random-access-memory.

,D. behaviour. attributes. data-cells.

,E. Source Code. Byte Code. The JVM.

,a

,9




,What does the term API stands for?



,A. Attribute Processing Implementation

,B. Application Parameter Index

,C. Application Programming Interface

,D. Assisted Processing Index

,E. Applet Parameter Implementation

,c

,8




,How can you prevent your class to be inherited further?


,A. Ask nicely in the JavaDoc

,B. Use the "closed" keyword

,C. Use the "restricted" keyword

,D. Use the “final” keyword
,
E. Use the "sealed" keyword

,d

,7




,What is the index of the first value in an array?


,A. 1

,B. 0

,C. start

,D. null

,E. Array.length

,b

,1



,A

 2 dimensional array can be described as a:


,A. Array of arrays

,B. Row of books on a shelf

,C. Cartesian plane of values

,D. Bimensional data dot-matrix

,E. None of the above

,a

,3




,Another word for Class is:


,A. Object

,B. Structure

,C. Enum

,D. All of the above

,E. None of the above

,e

,5




,A value type that consists of a set of named values is an?


,A. Enumeration

,B. Object

,C. Integrated Value Set (IVS)

,D. Integer

,E. Array

,a

,6




,Can a constructor be overloaded?


,A. Yes

,B. No

,C. Only in specific circumstances

,D. Yes -but only when exceptions are thrown

,E. Constructors can be overridden but not overloaded

,a

,4




,"String[][] fruits" is a:


,A. 1d String array

,B. 3d String array

,C. 3d char array

,D. 2d Integer array

,E. 4d String ArrayList

,c

,5




,Can an ArrayList hold multiple different types of objects at the same time?


,A. Yes

,B. No

,C. Yes -as long as all the types are ADTs

,D. Yes -but only since JDK 1.7.2

,E. Yes -but it is not recommend

,b

,3




,How do you declare an abstract class?


,A. With the "abst" keyword

,B. With the "abstract" keyword

,C. With the "enum" keyword

,D. With the "applet" keyword

,E. You cannot "declare" a class to be abstract

,b

,7




,What is "Multilevel Inheritance"?


,A. Inheritance that contains one base class and multiple derived classes of the same base class

,B. Inheritance that contains several base classes and a derived class

,C. Inheritance that allows the sub and super class to be interchangeable

,D. Inheritance that contains multiple base classes and multiple derived classed

,E. Inheritance that contains a class derived from a derived class

,e

,9




,What is encapsulation?


,A. Hiding your code from potential black-hat hackers

,B. Hiding your data from potential black-hat hackers

,C. Only providing the current class with access to its methods and variables

,D. Wrapping your classes in hashkeys

,E. None of the above

,c

,3




,Which is not a valid way to overload a method?


,A. Changing the number of parameters

,B. Changing the return type

,C. Changing the order of parameters

,D. Changing the data types of the parameters

,E. A and B

,b

,6

,How many decimals is long
,A: 1
,B: 2
,C: 6
,D: 15
,E: 420
,D
,4

,What is the limit on nested loops
,A: 4
,B: 10
,C: Unlimited
,D: 50
,E: 9
,C
,6

,"""=="" is an: 
,A: assignment operator
,B: equilibrium operator
,C: equals sign
,D: banana
,E: straight line error
,A
,4

,arraylist can hold up to _ values
,A: specificed by user
,B: dynamic
,C: 40
,D: none
,E: None of the above
,B
,6


,UserInput can take
,A: Strings
,B: doubles
,C: ints
,D: all of the above
,E: none of the above
,D
,7

,You can take input from a scanner
,A: 1 time
,B: 2 times
,C: 3 times
,D: No times
,E: You don't take input from a scanner
,A
,6

,if statements act upon ___ operators
,:A: int
,B: userinput
,C: boolean
,D: nested
,E: assignment
,C
,6

,How many decimals is int
,A: 7
,B: 44
,C: 0
,D: 1
,E: error
,C
,3

,Runtime errors occur when
,A : When you compile
,B : Your code is running
,C: After your code is done
,D: Before your code start
,E: None of the above
,B
,6

,The output of System.out.println("1+1") is
,A: 2
,B: null
,C: OutofBoundsException
,D: 1+1
,E: 11
,D
,2

,1.Which is not a primitive variable?


,A. Integer
,B. String
,C. Short
,D. Double
,E. Float
,B

,1


,What is the difference between a constructor and a method?

,A.There is no difference

,B.A method creates objects while a constructor is an ordinary function of a class
,C.A constructor creates objects while a method is an ordinary function of a class
,D.A method has the name of the class while the constructor does not
,E. Methods must return something while constructors may not
,C

,2

,What happens when you make something private?
,A.Only the class that owns the feature may access it
,B.Only one specific method can access it
,C.It cannot be accessed
,
D.You need a passcode to access it
,E.It is available to all classes on the same package
,A
,3


,What happens when there are multiple main() methods in the same class?

,A.Nothing. The code runs as usual
,B.The program will run two times at once
,C.Only one main() will run at a time. When the first finishes the next starts
,D.The main()s will split up the work and each run half
,E.The program will fail to compile because main() is already declared
,E

,2



,What is the difference between declaring a variable an defining a variable?

,A.Defining says only the type of variable. Declaration says the type and initializes it
,B.Declaration says only the type of variable. Defining says the type and initializes it
,C.Declaring a variable tells the user what it is. Defining it keeps it within the code
,D.Defining a variable tells the user what it is. Declaring it keeps it within the code
,E.There is no difference
,B
,2


,What is the difference between array and ArrayLists?

,A.Array can only hold primitive variable types
,B.ArrayLists can only hold primitive variable types
,C.An array’s size is determined before the program is run while an ArrayList’s size can be changed while the program is running
,D.An ArrayList’s size is determined before the program is run while an array’s size can be changed while the program is running
,E.There is no difference
,C
,1

,
Consider the following 


for(int i = 5; i > 0; i—-)

{

	for(int j = 6; j> 0; j—-)
	
	{
	   
	   System.out.println(“Hello”);

	}

}


How many times is Hello printed?
,A.10
,B.15
,C.20
,D.25
,E.30
,E
,2


,An array holds:

,A.Similar values of same data type
,B.Different values of same data type
,C.Same values of different data types
,D.Different values of different data types
,E.Only other arrays
,B
,1

,What is the size of a Char in Java?
,A.4 bits
,B.7 bits
,C.8 bits
,D.16 bits
,E.20 bits
,D
,1

,

Which of the following is the data type used for a single character?
,A.Char
,B.Short
,C.Long
,D.Byte
,E.Float
,A
,1

, How do you exit a loop from inside the loop?
,a: System.exit()
,b: exit;
,c: break;
,d: there is no way to in java
,e: back;
,c
,1
,How much code should be in a try block?
,a: as much as possible
,b: as little as possible
,c: one line only
,d: only methods
,e: all of your code
,b
,3
, On what line should braces start relative to the header?
,a: 1 line below
,b: the same line
,c: either or
,d: neither
,e: both!
,a
,2

,How do you compare two strings to see if they are identical
,a: ==
,b: .equals
,c: .equalsIgnoreCase
,d: it is impossible
,e: .equalsto
,b
,4
, Are java strings mutable?
,a: yes
,b: no
,c: mostly
,d: neither
,e: mutable has no meaning in java
,c
,3

, Is java turing complete?
,a: Yes
,b: No
,c: almost
,d: not even close
,e: Turing complete has no meaning in java
,c
,2

, How many spaces are in a tab?
,a: none - the tab is it's own character
,b: 4
,c: 8
,d: 2
,e: 6
,c
,3

,Generally

,A. Arrays are better than ArrayList
,B. ArrayLists are better than Arrays
,C. Depends on the circumstances
,D. B but also C
,E. Neither
,D
,2

,Code:
ArrayList <String> myArray = new ArrayList<String>();

myArray.size() returns:

,A. 0
,B. 1
,C. 2
,D. 3
,E. 4
,A
,1

,String is:

,A. An object
,B. A primitive
,C. An array of chars
,D. A and C
,E. None of these
,D
,2

,Code:
String[] newArray = null;
newArray[0] = "code";

Why does this compile but printing newArray[0] doesn't work?

,A. Wrong array name
,B. That cell is already filled
,C. That cell doesn't exist
,D. The array doesn't exist but it used to
,E. The array doesn't exist but the reference to it does
,E
,3

,Code:
String myString = "water";
System.out.println(myString.length());

,A. 5
,B. 6
,C. 4
,D. Nothing
,E. 10
,A
,2

,Why is it myArray.length but myArrayList.size()?

,A. length is private and its ArrayList equivalent is public
,B. length is private and its ArrayList equivalent is private
,C. length is public and its ArrayList equivalent is public
,D. length is public and its ArrayList equivalent is private
,E. Java programmers are inconsistent.
,D
,3

,Code:
System.out.println(one fish two fish red fish blue fish);
What does this print:
,A. one fish two fish red fish blue fish
,B. one two red blue
,C. Nothing
,D. Doesn't compile
,E. none of these
,D
,3

,Code:
System.out.println();
What are valid things to put in the brackets?
,A. a string
,B. a string surrounded by quotation marks
,C. a succession of string concatenated with plus signs
,D. an array
,E. B and C
,E
,2

,What do int byte char long have in common?
,A. They are all primitive types
,B. they all hold one value.
,C. they are not objects
,D. all of the above
,E. none of these
,D
,1

,Advantage of ArrayList over arrays?
,A. useful if you don't know the number of elements
,B. resizes automatically
,C. easier to track content
,D. a b & c
,E. none arrays are always superior
,D
,2

,Who invented Java?
,A. Linus Torvalds
,B. Steve Jobs
,C. Bill Gates
,D. James Gosling
,E. Charles Babbage
,D
,1


,Which parties have access to variables with the keyword "protected"?
I. Class
II. World
III. Package
IV. Subclass

,a: I only
,b: I and II
,c: IV only
,d: All
,e: I and III and IV
,e
,8

,What do accessor methods do?
,a: allow objects to access private class variables
,b: allow other programmers to use the code
,c: provide access to exclusive features in the program
,d: allow for object interaction while maintaining encapsulation
,e: a and d
,e
,5

,How would one instantiate a 2 dimensional array with 3 inner arrays each with 10 values?
,a: = new int[3]{};
,b: = new int[3][10];
,c: = new int[10][3];
,d: = new int(3)(10);
,e: = new int[][]{3}{10};
,b
,2

,What type of value does ArrayList<ArrayList<String>> hold?
,a: arraylist of Strings
,b: arraylist of arraylists
,c: Strings
,d: array of Strings
,e: the variable String
,a
,3

,Which of the following contains a ternary operator
,a: if(Math.random()? x=9?x=10); 
,b: String result = (x<0): "true" ? "tails";
,c: String result = (Math.random()>0.5)? "heads": "tails";
,d: for(x=1;x<10;x++){System.out.println(x);}
,e: for(int y=0;y<=10;y++){System.out.println(y)};
,c
,6

,Consider the following code:
public class Tester{
    int x=2;
    public Tester(int n){
        int x = 10;
        this.x = n+x;
    }
    
    public int getX(){
        return x;
    }
}

What does the getX() method return if the Tester object is instantiated with a
parameter of 5 (In code: Tester tObject = new Tester(5))?
,a: 0
,b: 12
,c: 7
,d: 15
,e: 2
,d
,8

,Cat snuggles = new Cat();
Animal zoo = new Animal();
If Cat extends Animal and implements Movements which of the following statements
causes a syntax error?
,a: snuggles = new Animal();
,b: Movements moves = new Cat();
,c: snuggles = zoo;
,d: zoo = new Animal();
,e: All will result in error
,a
,9

,Which java awt gui class is most suitable for multiple choice answers on a quiz
,a: JButton
,b: JTextField
,c: JCheckBox
,d: JRadioButton
,e: JMenuItem
,d
,5

,Consider the following code:
int x=3;
String output = "number "+x;
switch(x){
    case 1: output+="1";
    break;
    case 2: output+="2";
    break;
    case 3: output+="3";
    case 4: output="4";
    break;
    default: output+="x";
}
System.out.print(output);

What is the output?
,a: 4
,b: number 34
,c: number 4
,d: number 7
,e: 3
,a
,6

,Which Integer type has a large enough size to store all unicode character values?
,a: float
,b: short
,c: char
,d: long
,e: int
,c
,7

,int i = 5;
int j = 7;

System.out.println(i + "j");

What will this program print?
,A. i + j
,B. 5 + 7
,C. 57
,D. 5j
,E. 12
,D
,1

,What will the following code print?

int i = 2;

switch(i)
{
	case 0:
		System.out.println("a");
	case 1:
		System.out.println("b");
	case 2:
		System.out.println("c");
		break;
	case 3:
		System.out.println("d");
}
,A. abcd
,B. c
,C. cd
,D. abc
,E. Nothing. It won't compile
,B
,3

,Which of the following is true?

,A. primative variables can be dereferenced
,B. using the '>' operator on an object causes an error
,C. by making an instance variable static it will apply to all instances of that class
,D. a primitive variable must be declared as type name = new type(parameters);
,E. you can only have one object for each class
,C
,4

,Which of the following is true about this line of code

System.out.println(j);

,A. j must be the name of a String
,B. j must be an object
,C. out is the name of a method
,D. println is the name of a class
,E. none of the above
,E
,2

,How many times will this code run?

for(int i = 0; i < 100; i += 7)
{
	if(i < 50)
	{
		i += 3;
	}
	else
	{
		i -= 2;
	}
}

,A. 16
,B. 15
,C. 10
,D. 0
,E. infinite
,B
,6

,Which of the following is false

,A. Java is an object-oriented programming language
,B. Classes represent specific instances of objects
,C. What happens when an Object is printed can be changed by a toString() method
,D. What happens when a primitive variable is printed can not be changed
,E. A do while loop will always run at least once
,B
,3

,Which of these would cause an error

,A. int i = new Random().nextInt(0);
,B. if(new String("hat") == new String("dog"))
,C. while(true)
,D. String a = 5 + 3 + "";
,E. None of the above
,A
,8

,What would the following code print?

System.out.println(500 / 3);

,A. 500 / 3
,B. 166.66667
,C. 166.66
,D. 166
,E. 166.67
,D
,3

,What would the following code print?

if(true)
{
	System.out.print("a");
	if(((true || false) && (true && false)) ^ true)
	{
	System.out.print("b")
		if(!false)
		{
			System.out.print("c");
		}
	}
	
}

,A. a
,B. ab
,C. abc
,D. illegal Operand
,E. a illegal Operand
,C
,7

,Which of these would construct a 3-dimensional array of integers

,A. int<int<int<>>> a = new Integer<<<>>>;
,B. int[[[]]] a = new int[[[]]] new Integer[[[]]]];
,C. int[][][] a = new int[3][5][];
,D. int[2][5][7] a = new int[2][5][7];
,E. array(Integer)[3] a = new array(Integer)[3];
,C
,9

,Consider 
int a = 6; 
int b = 12; 
while(a<b){ 

  System.out.println("In the loop"); 

  a+=2;
  b-=2; 

}
How many times is the phrase "In the loop" printed?

,A.1
,B.2
,C.3
,D.4
,E.5
,B
,1

,In Java; elements of an array are automatically initialized to some default value. 
What is the default value for the elements of an array of integers?

,A.0
,B."0"
,C.null
,D.1
,E.'0'
,A
,2

,You want to initialize all of the elements of a double array a to the same value equal to 1.5.What could you write? 
Assume that the array has been correctly initialized.

,A. for(int i=1; i<a.length; i++) a[i] = 1.5;
,B. for(int i=0; i<=a.length; i++) a[i] = 1.5;
,C.for(int i=0; i<a.length; i++) a[i] = 1.5;
,D.for(int i=0; i<a.length+1; i++) a[i] = 1.5;
,E.for(int i=0; i<a.length-1; i++) a[i] = 1.5;
,C
,5

,Which of the following while statements is equivalent to 
do{ 
y=x+7; 
x++; 
}while(x<9); 


(Hint: You might want to draw a flow chart to figure out the answer) 
,A. 
y=x+7; 
x++; 
while(x<9){ 
  y=x+7; 
  x++; 
} 
,B. 
while(x<9){ 
  y=x+7; 
  x++; 
} 
y=x+7; 
x++; 
,C. 
while(x<=9){ 
  y=x+7; 
  x++; 
} 

,D.A and B 
,E.A B and C
,A
,6

,Consider the code 
int[] x = {5 6 7 8 9};//Assume actual code has commas separating input instead of spaces  
int[] y = x; 
y[2] = 10; 


What is the value of x[2]?

,A.6
,B.7
,C.10
,D.8
,E.0
,C
,6

,Consider the following piece of code: 
int i; 
for(i=0; i<10; i++){ 
/* some code that doesn't modify i */ 


} 
System.out.println("i="+i); /* line A */ 


What is printed by the statement on line A?

,A.i=0
,B.i=9
,C.i=10
,D.i=11
,E.This piece of code doesn't compile since the scope of i is limited to the for loop.
,C
,6

,What is printed by the following code fragment? 

int[] a = {0 1 2 3 4 5 6};//Assume actual code has commas separating input instead of spaces

System.out.println(a.length);

,A.5
,B.6
,C.7
,D.8
,E.Can't tell. There is not enough information.
,C
,5
 
,How would you declare and initialize a palette of Color objects Array of size 6?

,A. Color palette = new Color[5];
,B. Color palette[6];
,C. Color[5] palette;
,D. Color[] palette = new Color[6];
,E. Color[] palette = new Color[5];
,D
,5
 
,The documentation of a class lists a method castToIntArray that has a double array as a formal 
parameter and returns an array of integers. What is the signature of the method?

,A. public void castToIntArray(double[] a)
,B. public [] castToIntArray(double a)
,C. public int castToIntArray(double a)
,D. public int[] castToIntArray(double[] a)
,E. public int[] castToIntArray()
,D
,6

,Which of the following is true regarding the continue statement in a for loop?

,A. continue transfers the control flow to the initialization statement of the for loop.
,B. continue transfers the control flow to the conditional statement of the for loop.
,C. continue transfers the control flow to the update statement of the for loop.
,D. continue transfers the control flow to the statement just after the for loop
,E. continue transfers the control flow to the statement just before the for loop
,C
,8


, Which of the following best describes the set of all pairs of values for boolean variables a and b
such that (!a && b) == !(a || b) evaluates to true?

,a Empty set
,b Only one pair: a == true and b == false
,c Two pairs in which a == true
,d Two pairs in which a != b
,e All four possible combinations of values
,c
,4

,What is the largest hexidecimal number you can create with 2 digits?

,a AF
,b FF
,c CD
,d 25
,e ED
,b
,6

, If a b and c are integers which of the following conditions is sufficient to guarantee that: 
a < c || a < b && !(a == c) evaluates true?

,a a < c 
,b a < b
,c a > b	
,d a == b
,e a == c	
,a
,3

, A large Java program was tested extensively and no errors were found. 
What can be concluded?

,a All of the preconditions in the program are correct. 
,b All of the postconditions in the program are correct.
,c The program may have no bugs.
,d The program has no bugs.
,e Every method in the program may safely be used in other programs.
,c
,2

, What is the output from the following code: int x = 5; int y = 2; 
   System.out.println(x/y - (double)(x/y));

,a 0	
,b 0.5
,c -0.5
,d -2.5
,e none of the above
,a
,2

, What is the size of a double variable in Java?

,a 2 bytes
,b 4 bytes	
,c 8 bytes	
,d It depends on the compiler setting.
,e It depends on the operating system.
,c
,1

,When you try to compile MyClass the Java compiler gives an error message: 
   "MyClass is not abstract and does not override abstract method <some method> in java.util.Comparator" Which of the following is <some method> in the error message?
	
,a equals(myClass)
,b compareTo(myClass)
,c compare(myClass  myClass)// there is a coma where the space is.
,d compareTo(java.lang.Object)
,e compare(java.lang.Object  java.lang.Object)//there is a comma where ths space is.
,e
,5

,What is displayed by
System.out.println("1" + new Integer(2) + 3);?

,a The statement has a syntax error and won't compile
,b 6
,c 15
,d 123
,e ClassCastException
,d
,3

,Crossword extends Puzzle and implements Solvable. The following are declared. Which statement will cause a syntax error?
Puzzle p = new Puzzle()  Crossword cw = new Crossword(10  20) // Assume there is a coma in the space.

,A: p = cw;
,B: cw = new Puzzle();
,C:  p = new Crossword(10  20);// there is a coma where the space is.
,D: Solvable x = new Crossword(10  20); //there is a coma where the space is.
,E: All of the above will compile with no errors.
,b
,4

, Suppose all valid five-digit zip codes are represented as Integer objects and stored in a set containing about 4000 zip codes. Compare two implementations of this set: one is a HashSet with 400 buckets; another is a TreeSet. 
Assume that various zip codes are matched against the set with roughly the same frequency. Which of the following statements about the average performance of these implementations is true?

,A : HashSet works more than 100 times faster than TreeSet
,B : HashSet works about 20 times faster than TreeSet
,C : HashSet works 2-4 times faster than TreeSet
,D:  HashSet works slower than TreeSet
,E:  HashSet works roughly as fast as TreeSet. It also takes more than twice as much space
,c
,7