QUESTION 2

What would be the best description of polymorphism.

		A java object that can be attached to or refer to more than one class.
		An object that refers to its parent.
		An object that refers to itself.
		Downcasting.

5 points   

QUESTION 3

Java Swing classes allow for text components to be read only via what method?

		setReadOnly()
		setEditable()
		setEditOnly()
		setTextReadOnly()

5 points   

QUESTION 4

A constructor is a special kind of method within a class having the following features:

1) the name of the method is the same as the class name

2) it does not have any return type not even void

3) like other methods, constructors can also be overloaded

Choose the correct assumption(s) from the listing above.

		Only assumption 1 is correct.
		Assumptions 1 & 2 are correct
		None are correct.
		All assumptions are good.

5 points   

QUESTION 5

When creating a jar file (for executing a java program for a user) you can only choose one file in your package that has main().

True

False

5 points   

QUESTION 6

Which of the following is true about protected access?

		Protected members cannot be accessed by methods in any other classes.
		Protected members may be accessed by methods in the same package or in a subclass, but only if the subclass is in the same package.
		Protected members may be accessed by methods in the same package or in a subclass, even when the subclass is in a different package.
		Protected members are actually named constants.

5 points   

QUESTION 7

In the following code, System.out.println(num), is an example of ________.

double num = 5.4;

System.out.println(num);

num = 0.0;

		A value-returning method
		A local variable
		A complex method
		A void method

5 points   

QUESTION 8

A column in one table that references a primary key in another table is known as what?      

		referential key
		secondary key
		foreign key
		meta data

5 points   

QUESTION 9

Which is not a solid example of encapsulation?

		A Car class having a has-a relation with class Parts
		Taking for granted a wikipedia definition
		A washing machine and its use of a power Button
		java.util.Hashtable

5 points   

QUESTION 10

Given the depiction below, the relation of Song to Artist is one to one.

True

False

5 points   

QUESTION 11

To convert the double variable, d = 543.98, to a string, use the following statement.

		String str = Double.toString(d);
		String str = d.Double.toString(str);
		String str = double.toString(d);
		String str = double(d);

5 points   

QUESTION 12

An abstract class is not instantiated, but serves as a superclass for other classes.

True

False

5 points   

QUESTION 13

For an optimal OOD design it is best to have

		classes that are tightly coupled with high cohesion
		classes that are loosely coupled with low cohesion
		classes that are tightly coupled with low cohesion
		classes that are loosely coupled with high cohesion

5 points   

QUESTION 14

A search algorithm

		Arranges elements in ascending order
		Arranges elements in descending order
		Is a way to locate a specific item in a larger collection of data
		Is rarely used with arrays

5 points   

QUESTION 15

In an interface all methods have

		private access
		public access
		protected access
		packaged access

5 points   

QUESTION 16

Given the generic method below, what data types can be passed in?

public static   

void displayArray(E[ ] array) {

for (E element : array)

::

}

		any data type
		any reference type
		any data type that is a sub class of Number
		any type that a super class of Number

5 points   

QUESTION 17

The following statement creates an ArrayList object. What is the purpose of the notation?

ArrayList arr = new ArrayList<>();

		It specifies that everything stored in the ArrayList object will be converted to a String
		It specifies that only String objects may be stored in the ArrayList object
		Nothing as the statement is invalid.
		It specifies that the get method will return only String objects

5 points   

QUESTION 18

The String[] args parameter in the main method header allows the program to receive arguments from the operating system command-line.

True

False

5 points   

QUESTION 19

In a class hierarchy      

		the more general classes are toward the left of the tree and the more specialized are toward the right
		the more general classes are toward the bottom of the tree and the more specialized are toward the top
		the more general classes are toward the top of the tree and the more specialized are toward the bottom
		the more general classes are toward the right of the tree and the more specialized are toward the left

5 points   

QUESTION 20

Which of the following correctly tests the char variable chr to determine whether it is not equal to the character B?

		if (chr < ‘B’)
		if (chr != “B”)
		if (chr != ‘B’)
		if (chr > ‘B’)

5 points   

QUESTION 21

The three major categories of Java collections are

		tree sets, list sets, and hash maps
		lists, sets, and maps
		hash lists, hash tables, and sets
		sets, collections, and maps

5 points   

QUESTION 22

Given that String[] str has been initialized, to get a copy of str[0] with all characters converted to upper case, use the following statement

		str.uppercase();
		str[0].toUpperCase();
		str.toUpperCase();
		str[0].upperCase();

5 points   

QUESTION 23

What would be the results of the following code?

final int SIZE = 25;
int[] array1 = new int[SIZE];

… // Code that will put values in array1

int value = 0;
for (int a = 0; a <= array1.length; a++)
{
value += array1[a];
}

		value contains the lowest value in array1
		value contains the sum of all the values in array1
		value contains the highest value in array1
		This would cause the program to crash.

5 points   

QUESTION 24

What is the value of str after the following code has been executed?

String str;
String sourceStr = “Hey diddle, diddle, the cat and the fiddle”;
str = sourceStr.substring(12,17);

		Iddle
		diddl
		diddle
		, didd

5 points   

QUESTION 25

If a subclass constructor does not explicitly call a superclass constructor,

		The superclass fields will be set to the default values for their data types
		It must include the code necessary to initialize the superclass fields
		Java will automatically call the superclass’s default constructor just before the code in the subclass’s constructor executes
		Java will automatically call the superclass’s default constructor immediately after the code in the subclass’s constructor executes

5 points   

QUESTION 26

What term refers to data that describes other data?

		meta data
		pseudo-data
		micro data
		abstract data

5 points   

QUESTION 27

If a class contains an abstract method,

		The method must be overridden in subclasses
		You cannot create an instance of the class
		The method will have only a header, but not a body, and end with a semicolon
		All of the above

5 points   

QUESTION 28

In the following code, System.out.println(num), is an example of ________.

double num = 5.4;

System.out.println(num);

num = 0.0;

		A value-returning method
		A local variable
		A complex method
		A void method

5 points   

QUESTION 29

In the realm of JDBC use of PreparedStatements help prevent what?

		SQL Injection
		increased threads
		does not prevent anything, just executes insert statements like JDBC statements do
		execution of stored procedures

5 points   

QUESTION 30

If a subclass constructor does not explicitly call a superclass constructor,

		It must include the code necessary to initialize the superclass fields
		The superclass fields will be set to the default values for their data types
		Java will automatically call the superclass’s default constructor just before the code in the subclass’s constructor executes
		Java will automatically call the superclass’s default constructor immediately after the code in the subclass’s constructor executes

5 points   

QUESTION 31

Given:

public class MyPancake implements Pancake {  

public static void main(String[] args) {  

List x = new ArrayList();  

x.add(“3”); x.add(“7”); x.add(“5”);

List y = new MyPancake().doStuff(x);  

y.add(“1”);  

System.out.println(x);  

}

List doStuff(List z) {

z.add(“9”);

return z;

}

}

interface Pancake {

List doStuff(List s);

}

What is the most likely result?

		An exception is thrown at runtime
		Compilation fails
		[3, 7, 5, 9, 1]
		[3, 7, 5]
		[3, 7, 5, 9]

5 points   

QUESTION 32

Assume q passed into the function below is: q={10,9,8,7,6,5,4,3,2,1}

What would be the resulting stack (st) at the line below with the comment labeled //1.____

public Queue interChanger(Queue q){
Stack st = new Stack();

int size = q.size()/2;
for(int i = 1; i <= size; i++){  

st.push(q.remove()); //1. ____________

}

while(!st.isEmpty()){

q.add(st.pop()); //2. ____________

}

for(int i = 1; i <= size; i++){  

q.add(q.remove()); //3. ____________

}

for(int i = 1; i <= size; i++){

st.push(q.remove()); //4. ____________

}

while(!st.isEmpty()){

q.add(st.pop());    

q.add(q.remove()); //5. ____________

}   

return q;

}

		12345
		54321
		678910
		109876

5 points   

QUESTION 33

A major problem when classes are tightly coupled may be when what occurs?

		When functions using local variables change the variables unexpectedly
		When global variables that are in use and cause havoc perhaps upon any changes to them
		When the constructor of a class no longer can rely on changes to the class variablesupon instantiation being unchanged
		Tightly coupled classes are actually very beneficial and recommended to be coded in that fashion.

5 points   

QUESTION 34

As a programmer we should try to

		balance between tightly and loosely coupled classes.
		minimize the use of coupling relations of classes
		maximize the use of any coupling relations of classes
		only allow tight coupling when changes need to be made to classes for maintenance purposes.

5 points   

QUESTION 35

Given the Regex expression:

^[a-z0-9_-]{3,15}

and a string to compare against the expression such as

tom-thumbtomthumb

a match would be

		tom
		tom-
		tom-thumbtomthu
		tom-thumbtomthumb

5 points   

QUESTION 36

What would be the results of executing the following code?

StringBuilder str = new StringBuilder(12);
str.append(“The cow”);
str.append(” jumped over the “);
str.append(“moon.”);

		variable str would equal “The cow jump”
		variable str would equal “The cow jumped over the”
		variable str would equal “The cow jumped over the moon.”
		The program would crash.

5 points   

QUESTION 37

Given the ages for object creations for class AgeGroups as 33,22,44,55 respectively, what would the following Comparator declaration return for each age outcome order?

Collections.sort(listDevs, new Comparator() {

@Override

public int compare(AgeGroups o1, AgeGroups o2) {

return -o1.getAge() ;

}

});

		33,22,44,55
		55,44,22,33
		22,33,44,55
		order would be random

5 points   

QUESTION 38

An abstract class cannot be instantiated primarily because

		any of the class attributes cannot be modified
		subclasses should only be allowed to implement the desired behaviors associated with the abstract class its inheriting from
		methods may choose to be overriding any behaviors that may be declared abstract by the inherited abstract class
		too much memory would be allocated for both the super (abstract) class and any of its decendents.

5 points   

QUESTION 39

In the following code, assume that inputFile references a Scanner object that has been successfully used to open a file:

double totalIncome = 0.0;
while (inputFile.hasNext())
{
try
{
totalIncome += inputFile.nextDouble();
}
catch(InputMismatchException e)
{
   System.out.println(“Non-numeric data encountered ” +
“in the file.”);
inputFile.nextLine();
}
finally
{
totalIncome = 35.5;
}
}

What will be the value of totalIncome after the following values are read from the file?
2.5
8.5
3.0
5.5
abc
1.0

		0.0
		19.5
		75.0
		35.5

5 points   

QUESTION 40

In an interface all methods have

		private access
		public access
		packaged access
		protected access

Artist Performs Song