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

DESCRIPTION OF THE PROCESS OF MANUFACTURING THE BALL HAMMER

The process begins with the arrival of 6-foot-long unpolished carbon steel bars, which are sent to the raw material warehouse after order verification. The bars are shipped from the raw material warehouse to each of the manufacturing cells in batches of 14 bars per pallet in a hydraulic skate to complete 100 bars a day.

The roadmaps of the machining process of the 3 parts in the corresponding cells are shown, the times shown are standard and per piece.

Table 1 of consumption of the first semester of the year of the hammer ball

2014    2015 2016 2017

Raw Material ($ / bar)	$619.95	$619.39	$619.88	$623.50
Machinery ($/hr)	$248.49	$258.63	$264.14	$273.01
labor ($/hr)	$13.52	$13.48	$13.47	$13.50
Energy ($/kWh)	$0.0588	$0.0589	$0.0583	$0.0668
Production of the 1st semester	24,000	20,500	20,500	22,000
Sale price	$1418.60	$1425.73	$1427.16	$1432.60
Total hours worked per year	9,600	9,600	10,560	9,600
KWh per year	7,920	7,920	8,712	7,920
Pieces per Steel bar	3	3	3	3
Total workers	7	7	7	7

Road map 1

Company:	MARTINILLO S.A de C.V.	Made by:
	Name of the part:	Plug	Part number	10A
Product:	Hammer ball	Date:	30/Agosto/2017
Operation number	Operation Description	Machine tipe	Departament	Standard time (min)
1	Verify measures	Bank	Machining – C1	0.5
2	Face extremes	Lathe	Machining – C1	2
3	Open center at one end	Lathe	Machining – C1	1
4	Roll	Lathe	Machining – C1	4
5	Machining bevel	Lathe	Machining – C1	0.5
6	Mechanize radio	Lathe	Machining – C1	2
7	Drill hole	drill	Machining – C1	3
8	Mecanize thread	Lathe	Machining – C1	3
9	roll	Lathe	Machining – C1	1
10	Mecanize radio	Lathe	Machining – C1	3
11	Perform the knurling	Lathe	Machining – C1	2
12	Rectifiy measure and polish	Bank	Machining – C1	1

The operator carries out the verification and rectification of the piece in the inspection bench that is at a distance of 2 steps from the lathe (1.08 min). The drill and the bench are at the same distance from 2 steps. The finished pieces are sent to the assembly line in batches of 50 units).

Company:	MARTINILLO S.A de C.V.	Made by:	Ing. Ríos
	Name of the part:	Mango	Part number	20B
Product:	Hammer ball	Date:	30/Agosto/2017
Operation number	Operation description	Machine type	Departament	Standard time (min)
1	Verify measures	Bank	Machining- C2	0.5
2	Face extremes	Lathe	Machining – C2	3
3	Open center at one end	Lathe	Machining – C2	1
4	roll	Lathe	Machining – C2	10
5	Machining bevel	Lathe	Machining – C2	0.5
6	Perform knurling	Lathe	Machining – C2	3
7	Drill hole	drill	Machining – C2	6
8	Machining bevel	Lathe	Machining – C2	0.5
9	Machining thread	Lathe	Machining – C2	5
10	Roll	Lathe	Machining – C2	2
11	Roll	Lathe	Machining – C2	2
12	Machining bevel	Lathe	Machining – C2	0.5
13	Machining cone	Lathe	Machining – C2	5
14	Machining thread	Lathe	Machining – C2	4
15	Rectify measures and polish	Bank	Machining – C2	2

The operator carries out the verification and rectification of the piece in the inspection bench that is at a distance of 2 steps from the lathe (1.08 min). The drill and the bench are at the same distance from 2 steps. The finished pieces are sent to the assembly line in batches of 50 units).

Roadmap 3

Company:	MARTINILLO S.A de C.V.	Made by:	Ing. Ríos
	Name of the part:	Double head	Part number	30C
Product:	Hammer ball	Date:	30/Agosto/2017

Operation number	Operation description	Machine type	Departament	Standard time (min)
1	Verify measures	Bank	Machining – C3	0.5
2	Face extremes	Lathe	Machining – C3	2.5
3	Roll	Lathe	Machining – C3	2
4	Mechanize radios	Lathe	Machining – C3	5
5	Mechanize bisel	Lathe	Machining – C3	0.5
6	Roll	Lathe	Machining – C3	1
7	Mechanize radio	Lathe	Machining – C3	2
8	drill hole	Milling machine	Machining – C3	4
9	Mechanize hole	Milling machine	Machining – C3	3
10	Mechanize thread	Lathe	Machining – C3	4
11	Rectify measures and polish	Bank	Machining – C3	1

The operator carries out the verification and rectification of the piece in the inspection bench that is at a distance of 2 steps from the lathe (1.08 min). The drill and the bench are at the same distance from 2 steps. The finished pieces are sent to the assembly line in batches of 50 units). The milling machine is two steps away from the bench and two steps away from the lathe. The pieces (lot of 50 units) that leave cell 3 are sent to the assembly line.

The assembly process begins when the handle (piece 20B and the double head (piece 30C) are finished.) Both pieces arrive at the assembly line from the department from the corresponding cell in batches of 50 pieces. the handle to form the subassembly 40 (3 min) subsequently the plug (piece 10A) is assembled in the subassembly 40 (1.5 min) finally inspected (1 min) and packed individually (2 min) and then in batches of 10 hammers (20 sec per hammer).

The assembly line is divided into 4 stations, the number of operators assigned is to cover the volume of 22,000 hammers a semester, working shifts of 8 hours a day, 25 days a month. The plant supervisor has been able to quantify that the workers lose an average of 10 minutes a day in the change of shift, in addition to the 30 minutes they are given to eat. Table 2 shows information about the assembly line:

Table 2: Assembly line stations

Station Labor Standard time (min) Number of operators

1	Assemble the double head in the handle to form a subassembly 40	3	1
2	Assemble the plug in subassembly 40	1.5	1
3	Inspect and pack individually	3	1
4	Pack lot of 10 hammers	3.33	1
	Total	10.83	4

A) Determine the possibility of reducing processing times and increasing production by coupling more machines to each operator of the manufacturing cells.
How many more machines could the worker operate? What would be the benefits in terms of cycle time and parts produced? Is it possible to increase machines from the economic point of view? (Diagrams man machine of each cell, cycle time, number of pieces, maximum number of machines that can attend, besides answering the analysis questions).

B) If the company wants to increase its production for the second semester of the year to 200 hammers, what would be the changes that would occur in the assembly line? (Operators, cycle time, efficiency). From the point of view of productivity what would be the percentage change for this second semester? It agrees or not to do the increase in the production. (Line balancing, cycle time, efficiency, number of operators)