CS101: Introduction to Computer Science 1 Exam Answers

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CS101: Introduction to Computer Science 1 Exam Answers – Saylor Academy

Question 1: Which of the following technological developments initiated the introduction of general purpose computers, used first for large-scale numerical calculations and later for commercial applications?

Radio
Telegraph
FORTRAN
Vacuum tubes

Question 2: Which of the following subsets of English sentences is modeled by propositional logic?

Declarative
Exclamatory
Imperative
Question

Question 3: Which of the following do logical statements, programs, and the execution of programs correspond to, respectively?

Design, implementation, and testing
Requirements, construction, and testing
Design, construction, and implementation
Requirements, design, and implementation

Question 4: What is the technical term for the basic computer model?

Architecture
Flowchart
Procedure
Process

Question 5: What is a methodology?

A set of general steps needed to perform a stage of the system life cycle
A set of tools that supports the activities of each stage of the system life cycle
A set of processes that guides the stages of the system development life cycle
A procedure that specifies detailed steps to perform a stage of the system life cycle

Question 6: Programming languages are classified by the type of design model or paradigm that their constructs and features support. Which programming paradigm is Java based on?

Functional
Imperative
Logic
Object

Question 7: How does one obtain a Java Development Kit (JDK), which is required for establishing a Java development environment?

Lease the JDK
Purchase a JDK license
Purchase a copy of JDK
Accept the JDK license terms

Question 8: You are using the Java Development Kit to write a simple program, and are compiling a program called ‘sample’. Which of the following files would contain the Java bytecode?

sample.exe
sample.java
sample.class
sample.bytecode

Question 9: Computers cannot replicate many human characteristics, but have aspects that make them good tools to assist people in performing tasks or solving problems. Which of the following is one of those aspects?

Creativity
Curiosity
Ethics
Logic

Question 10: Compared to procedural programming, which of the following is true about object-oriented programming?

It Increases software development costs and improves software quality
It decreases software development costs and improves software quality
It increases software life-cycle costs and decreases coupling of implementation and use
It decreases software life-cycle costs and increases coupling of implementation and use

Question 11: Which of the following best describes a class in object-oriented programming?

Data and related object-oriented functions
A data type for a set of object-oriented programs
An object-oriented construct for saving the state of an object
A program construct used to define objects that share common attributes

Question 12: Given three Java classes A, B, and C that form this class hierarchy diagram:

Which of the following correctly represents the class hierarchy of the diagram?

B is a subclass of A, and C is a subclass of B
A is a subclass of B, and B is a subclass of C
A is a superclass of C, and B is a superclass of C
A is a superclass of B and C, and C is a subclass of A

Question 13: In the first step of creating a Java application, a source program is written using an editor. Which of the following statements about this step is true?

Any text editor may be used to create a Java source program
Java source files can be of many file types, such as .txt, .java, .xml, or .docx
The file name of a Java source file must be the name of the only public class in the file
Word Processing software such as Microsoft Word is often used to create Java source programs

Question 14: To use a single class in a Java package, which of the following must a program do?

Include the Java package in the Java command line
Include the Java package in the Javoc command line
Import the Java package anywhere in the java source file
Import the Java class at the beginning of the java source file

Question 15: Which of the following is a special data-type that is supported by Java?

short
int
logic
string

Question 16: Calculations involving values of a given data-type may give a result that is outside the finite range of the data-type. Which of the following Java calculations would give a result that is outside the range for its indicated data-type?

Using double, calculate 7 / 2
Using int, calculate 50000 + 5000000
Using short, calculate 1+2+3+……+200
Using unsigned int, calculate 100 – 5000

Question 17: What would the value of y be after this code is executed?

int y = 2;

y = y – –y;

-2
-1
0
1

Question 18: What would this code output after it is executed?

public class Practice {

public static void main(String[] args) {

String str = new String(“Technology through engineering to design.”);

str = str.substring(11);

System.out.println(str);

}

Technology
Through engineering to design.
Technology through engineering to design.
A compile error, since a string is immutable

Question 19: What data-types do the == and != relational operators apply to?

Any Java object type
Any primitive data type
Only char and string types
Only primitive numeric types

Question 20: A student’s numeric grade is converted to a letter grade using a set of conditions. For example, if their grade is between 70 and 79, inclusive, then their grade is C. Which of the following code snippets accurately represents these conditions?

(grade >= 70) && (grade < 80)
(grade <= 80) && (grade > 70)
!(grade < 70) || !(grade >79)
!((grade < 70) || (grade >79))

Question 21: A common logical operation is implication, which is often written as A → B. This is false when A is true and B is false, and true otherwise. Which of the following Java logical expressions is equivalent to A → B?

(A&& B) || !B
(A && B) || !A
(A || B) && (!A || B)
(B && !A) || (A && B)

Question 22: Two logical expressions are equivalent if and only if which of the following are true?

They have the same form
They have the same values
They have the same truth tables
They have the same symbols in the same order

Question 23: Which of the following statements acts as a control structure?

int x;
x = 1;
if then
puts

Question 24: Engineers must measure visual acuity so that systems that involve visual output will be optimized for most of the population. Suppose you are projecting slides from a computer monitor, you want to choose a font size, which is dependent on the size of the classroom, that enables slides to be comfortably read by most students. Which of the following Java ‘if’ statements would output an optimal font size for a given room size and given visual acuity?

if (roomLength == 20) (if (visualAcuity – 1.0 < .001))

// checks for acuity equal to 1+-.001

System.out.println(“Recommended font size for a room of length “

+ roomLength + ” is: ” + DisplayPixel(roomLength, visualAcuity));

//DisplayPixel is a function call that does the engineering calculation

if (roomLength == 20) if (visualAcuity – 1.0 < .001)

// checks for acuity equal to 1+-.001

System.out.println(“Recommended font size for a room of length “

+ roomLength + ” is: ” + DisplayPixel(roomLength, visualAcuity));

//DisplayPixel is a function call that does the engineering calculation

if (roomLength == 20) {if (visualAcuity – 1.0 < .001)

// checks for acuity equal to 1+-.001

System.out.println(“Recommended font size for a room of length ” +

roomLength + ” is: ” + DisplayPixel(roomLength, visualAcuity))};

//DisplayPixel is a function call that does the engineering calculation

if (roomLength == 20) if (visualAcuity – 1.0 < .001)

// checks for acuity equal to 1+-.001

{System.out.println(“Recommended font size for a room of length ” +

roomLength + ” is: ” + DisplayPixel(roomLength, visualAcuity))};

//DisplayPixel is a function call that does the engineering calculation

Question 25: The syntax of a switch statement includes sections like:

switch (expression)

{ case label1 :

Which of the following rules are correct for expression and label1?

Variables in expression and label1 can be global variables
label1 and the variables in expression must be of integer type
expression must evaluate to an integer and label1 must be an integer literal
If expression equals the variable label1, the statements of label1 are executed

Question 26: What would be the best way to rewrite this code using a for loop?

int cost, ticket; //ticket is given a value of 1, 5, or 9 dollars

//for red, green, and blue tickets, respectively

switch (ticket) //ticket is drawn and is one of several winning tickets

{

case 1:

cost = ticket;

System.out.println(“ticket cost $” + cost);

System.out.println(“ticket wins $” + cost * 10);

break;

case 5:

cost = ticket;

System.out.println(“ticket cost $” + cost);

System.out.println(“ticket wins $” + cost * 10);

break;

case 9:

cost = ticket;

System.out.println(“ticket cost $” + cost);

System.out.println(“ticket wins $” + cost * 10);

}

int cost, ticket = 1; //value of ticket comes from System.in

for (; ticket != 0;) {

cost = ticket;

System.out.println(“ticket cost $” + cost);

System.out.println(“ticket wins $” + cost * 10);

ticket = value; // ticket given a value of 1, 5, 9 from input

break;

}

int cost, ticket; //value of ticket comes from System.in

for (; ticket != 0;) {

cost = ticket;

System.out.println(“ticket cost $” + cost);

System.out.println(“ticket wins $” + cost * 10);

ticket = 1; // ticket given a value of 1, 5, 9 from input

}

int cost, ticket = 1; //value of ticket comes from System.in

for (; ticket != 0;) {

ticket = cost;

System.out.println(“ticket cost $” + cost);

System.out.println(“ticket wins $” + cost * 10);

ticket = 1; // ticket given a value of 1, 5, 9 from input

break;

}

int cost, ticket = 1; //value of ticket comes from System.in

for (;;;) {

cost = ticket;

System.out.println(“ticket cost $” + cost);

System.out.println(“ticket wins $” + cost * 10);

ticket = 1; // ticket given a value of 1, 5, 9 from input

}

Question 27: In Java, how is information passed to an object?

By class data
By static data
By local variables
By method arguments

Question 28: A method is called by writing the name of a method in a statement. What must this be preceded by?

The program name in which the method is defined and a dot
The name of the class in which the method is defined and a dot
The name of an instance of the class in which the method is defined and a dot
The keyword new followed by the name of a class constructor for the method

Question 29: Which of the following statements about the use of arrays is correct?

An array is a java object
An array parameter is passed by reference
An array can be used to group different types
Components of an array are accessed by simple identifiers

Question 30: Which of the following diagrams gives a correct logical representation of the memory allocation of a two-dimensional array? A box represents a location in the computer’s memory, a line entering a box indicates the value stored in the box, and a line whose end is near a boundary or on the boundary of a box indicates the address of the box.

Answer: Option D

Question 31: Which of the following code snippets produces a different result than that of the others, given these definitions?

Car[] inventory = new Car[3];

inventory[0] = new Car(“LCAR”, “Infinity”, 5000, “in”);

inventory[1] = new Car(“FFAR”, “Expedition”, 23000, “in”);

inventory[2] = new Car(“SFAR”, “Explorer”, 32000, “in”);

for (Car findCar: inventory) {

findCar.statusCar = “in”;

System.out.print(findCar.typeCar + ” “);

System.out.print(findCar.modelCar + ” “);

System.out.println(findCar.statusCar + ” “);

}

int[] indexArray = { 0, 1, 2 };

for (int findCar: indexArray) {

inventory[findCar].statusCar = “in”;

System.out.print(inventory[findCar].typeCar + ” “);

System.out.print(inventory[findCar].modelCar + ” “);

System.out.println(inventory[findCar].statusCar + ” “);

}

Car[] indexArray = { inventory[0], inventory[1], inventory[2] };

for (int findCar: indexArray) {

findCar.statusCar = “in”;

System.out.print(findCar.typeCar + ” “);

System.out.print(findCar.modelCar + ” “);

System.out.println(findCar.statusCar + ” “);

}

Car[] indexArray = { inventory[0], inventory[1], inventory[2] };

for (Car findCar: inventory) {

findCar.statusCar = “in”;

System.out.print(findCar.typeCar + ” “);

System.out.print(findCar.modelCar + ” “);

System.out.println(findCar.statusCar + ” “);

}

Question 32: Which of the following is Java standard I/O?

System.read
System.err
System.util.scanner.nextInt()
System.util.scanner.nextLine()

Question 33: Data that is read or written by a Java program can be part of the program, or it can be stored on an external device such as a disk. When would you want to store data on an external disk?

When data used by a program is useful for other programs
When data used by a program is dependent on the program
When you want the program to write its data faster than to external file
When you want the program to read its data faster than from an external file

Question 34: Which statement correctly describes how Java classes are applicable for retrieving external data?

The Scanner class can be used to read byte data
The Scanner class can be used to read input data
Data can only be read from a file using the FileReader class.
The Scanner class can only be used to read data from the keyboard

Question 35: What would this code output after it is executed?

public class Main {

public static void main(String[] args) {

Object x[] = new Object[3];

x[0] = new Integer(0);

System.out.println(“Hello World”);

}

Hello World
It would give a null pointer exception
It would give an array store exception
It would give an out of bounds exception

Question 36: Which lines of this code will be executed?

1 public class Main {

2 public static void main(String[] args) {

3 String s = “Tvhis is a string.”;

4 System.out.println(s);

5 int end = s.length();

6 int start = 18;

7 System.out.println(“length of string ” + end);

8 if (start > end)

9 throw new StringIndexOutOfBoundsException(“Exception: start

of the substring is greater than the length of the substring “);

11 try {

12 System.out.println(s.substring(start));

13 } catch (StringIndexOutOfBoundsException e) {

14 System.out.println(e.getMessage());

15 System.exit(0);

16 }

17 }

18 }

3, 7, 11
3, 7, 9, 13
3, 7, 11, 13
3, 7, 9, 11, 13

Question 37: How is semantics specified in propositional logic?

Each atomic statement is assigned the value True
Each atomic statement is assigned the value False
If an atomic statement is true, it is assigned the value True; otherwise it is False
A sequence of n atomic statements is assigned 2n permutations of True and False

Question 38: Which of the following is a hardware component of the basic computer model?

GUI
RAM
Cache
Transistor

Question 39: Which stages of the programming life cycle model are associated with synthesis activities, such as composing components to create the structure of a program?

Design and implementation
Implementation and Testing
Requirements and Design
Requirements and Testing

Question 40: You are using the Java Development Kit to write a simple program. Which of the following commands would you use to run a Java program called sample?

run sample
java sample
run sample.class
java sample.class

Question 41: Which of the following use cases would a computer be best for?

To make decisions
To discover new information
To execute sets of instructions
To recognize problems and create solutions

Question 42: Which of the following do procedural languages use to construct programs?

Objects and messages
Functions and operations
Predicates and operations
Data and control statements

Question 43: Which of the following best describes an object, in object-oriented programming?

A set of values for a data type
A data type and its associated programs
A construct that characterizes a member of a class
A set of constructs that communicate via messages

Question 44: What command would you use to compile this Java source code from a file called Test.java?

class Hello {

Public static void main(String[] args) {

System.out.println(“Hello World!”);

}

java Hello
javac Hello
java Test.java
javac Test.java

Question 45: Which of the following best describes a Java package?

A collection of classes used by a program
A collection GUI tools used by a program
A collection of objects that make up a program
A collection of programs used by an application

Question 46: Which of the following is the default size (that is, the maximum value) of the set of values having type int?

2³¹
2⁶⁴
(2³²)-1
(2⁶⁴)-1

Question 47: Which of the following is the most appropriate Java primitive type to use for scientific calculations involving very large numbers?

binary
decimal
double
long

Question 48: Relationships of operands can usually be expressed in different ways. If x and y are of type int, then which of the following is equivalent to x <= y?

!(x > y)
-x <= -y
(x < y) && (x = y)
(x +1) >= (y + 1)

Question 49: A university has a student database containing information on student enrollment. If you want a report of all enrolled students (whose status is e) who have at least 60 credits, which of the following relational expressions would you use?

if (status == ‘e’) {

if (credits >= 60)

System.out.println(“student:”, studentID);

};

if (status = ‘e’) {

if (credits >= 60)

System.out.println(“student:”, studentID);

};

(if status == ‘e’) {

(if credits >= 60)

System.out.println(“student:”, studentID);

};

if (status = ‘e’) {

if (credits! < 60)

System.out.println(“student:”, studentID);

};

Question 50: A person can donate blood if their age is between 18 and 60 and if they have a minimum weight of 110 pounds. Which of the following Java expressions would most precisely select those who can be blood donors?

int age, weight;

(age >= 18 && age <= 60) && (weight >= 110))

long age, weight;

(age >= 18. && age <= 60.) && (weight >= 110.)

int ageInMonths ; long weight;

(ageInMonths >= 216 && ageInMonths <= 720) && (weight >= 110.)

int ageInMonths; long weight;

(ageInMonths >= 216 && ageInMonths <= 720) && (weight > 109.9999)

Question 51: To give blood, someone must have a minimum weight of 110 pounds, be older than 17 years old, and have an iron level that is over 12. If the iron reading is 12, a second iron level test is conducted, and its result is used to determine eligibility for donation. Which of the following Java condition statements uses relational operations to express these eligibility conditions?

(weight >= 110) && (age >= 17) && (iron2 >12.0)
((weight >= 110) && (age >= 17)) || ((iron1 >= 12.0) || (iron2 >= 12.0))
((weight >= 110) && (age >= 17)) && ((iron1 >= 12.0) || (iron2 >= 12.0))
((weight >= 110) && (age >= 17) && (iron1 >12.0)) || ((weight >= 110) && (age >= 17) && (iron2 >12.0))

Question 52: In the United States, routes that run east-west are given even numbers, and those that run north-south are given odd numbers. Which of the following if statements would correctly test the direction of a route?

int routeNum = 95;

if (routeNum % 2 == 0)

System.out.println(“Route ” + routeNum + ” runs east-west”)

else System.out.println(“Route ” + routeNum + ” runs north-south”);

int routeNum = 95;

if (routeNum % 2 == 0)

System.out.println(“Route ” + routeNum + ” runs east-west”);

else System.out.println(“Route ” + routeNum + ” runs north-south”);

int routeNum = 95;

(if routeNum % 2 == 0)

System.out.println(“Route ” + routeNum + ” runs east-west”);

else System.out.println(“Route ” + routeNum + ” runs north-south”);

int routeNum = 95;

if (routeNum % 2 == 0)

System.out.println(“Route ” + routeNum + ” runs east-west”);

else {

System.out.println(“Route ” + routeNum + ” runs north-south”);

}

Question 53: What would this code output after it is executed?

int label = 2;

switch (label) {

default: System.out.println(“default”);

case 1:

{

System.out.println(“case 1”);

switch (label) {

case 1:

System.out.println(“case 11”);

case 2:

System.out.println(“case 12”);

}

case 2:

System.out.println(“case 2”);

case 3:

System.out.println(“label 3”);

}

label 3
case 2
label 3
It would give a compile error
It would give a runtime error

Question 54: How does Java object A send a message to Java object B?

A calls any method of B
A calls a public method of B
A calls one of its methods which interfaces with B
A calls a class script, which in turn shares data with B

Question 55: This Java program uses generic words for identifiers, and can be used as a template for developing Java code. Which of the following would change the value of instanceData to 4?

public class ClassName {

int instanceData = 7;

public ClassName(int data) {

instanceData = data;

} // ClassName (data) – constructor

public ClassName() {

instanceData = 0;

} // ClassName (data) – constructor

public void ChangeInstanceData(int num) {

instanceData = num;

}

// ChangeInstanceData (int num)

public int getInstanceData() {

return instanceData;

} // getInstanceData ()

public void reportData() {

System.out.println(

“value of instanceData: ” +

getInstanceData());

} // reportData ( )

} // ClassName

public class Main {

public static void main(String[] args) {

changeInstanceData(4);

}

public static void main(String[] args) {

instanceData = 4;

}

public static void main(String[] args) {

ClassName obj = new ClassName();

obj.instantData = 4;

}

public static void main(String[] args) {

ClassName obj = new ClassName();

obj.ChangeInstanceData(4)

}

Question 56: Which of the following statements is correct about the syntax of an enhanced for-loop header iterating over the elements of an array?

An enhanced for-loop uses subscripts to incrementally access elements of an array.
An enhanced for-loop has a concise structure related syntax for iterating over an array.
An enhanced for-loop generates validity checks for indices used in the body of the loop.
An enhanced for-loop uses for-loop features together with structure related features to iterate over an array.

Question 57: You want to display the heading “ID# CUSTOMER NAME” for a report. Which of the following Java code snippets would format the heading in this way?

String s1 = ” CUSTOMER”;

String s2 = ” NAME”;

String s3 = ” ID#”;

System.out.println(“%2$s %1$s”, “s1+s2”, “s3”);

String s1 = ” CUSTOMER”;

String s2 = ” NAME”;

String s3 = ” ID#”;

System.out.println( % 2 $s % 1 $s “, s1+s2, s3.;

String s1 = ” CUSTOMER”;

String s2 = ” NAME”;

String s3 = ” ID#”;

String heading = String.format(“%2$s %1$s”, s1 + s2, s3.;

System.out.println(heading);

String s1 = ” CUSTOMER”;

String s2 = ” NAME”;

String s3 = ” ID#”;

String heading = String.format(“%2$s %1$s”, “s1+s2”, “s3”);

System.out.println(heading);

Question 58: You work at a car rental company. CarInventory.txt is a character file that contains rental car data. Each line contains a carId, carType, carModel, carMileage, and carStatus. Which of the following code snippets would correctly append additional cars to the inventory?

import java.io.*;

class WriteCarFile {

public static void main(String[] args) throws IOException {

String carfileName = “CarInventory.txt”;

writer.open();

FileWriter writer = new FileWriter(carfileName, true);

writer.write(“4 LCAR Audi 0 in\n”);

writer.write(“5 FFAR Suburban 0 in\n”);

writer.write(“6 PPAR Ford150 0 in\n”);

writer.close();

}

import java.io.*;

class WriteCarFile {

public static void main(String[] args) {

String carfileName = “CarInventory.txt”;

FileWriter writer = new FileWriter(carfileName, false);

writer.write(“4 LCAR Audi 0 in”);

writer.write(“5 FFAR Suburban 0 in”);

writer.write(“6 PPAR Ford150 0 in”);

writer.close();

}

import java.io.*;

class WriteCarFile {

public static void main(String[] args) throws IOException {

String carfileName = “CarInventory.txt”;

FileWriter writer = new FileWriter(carfileName, true);

writer.write(“4 LCAR Audi 0 in\n”);

writer.write(“5 FFAR Suburban 0 in\n”);

writer.write(“6 PPAR Ford150 0 in\n”);

writer.close();

}

import java.io.*;

class WriteCarFile {

public static void main(String[] args)

{

String carfileName = “CarInventory.txt”;

FileWriter writer = new FileWriter(carfileName, true);

writer.write(“4 LCAR Audi 0 in\n”);

writer.write(“5 FFAR Suburban 0 in\n”);

writer.write(“6 PPAR Ford150 0 in\n”);

writer.close();

}

Question 59: When in the programming process does an exception occur?

At run-time
At design time
At compile time
During requirements specification

Question 60: 8e.2. Which of the following statements correctly describes which methods must have a ‘throws’ or ‘throw’ clause?

Every method
A method that might cause an exception
Only the methods that have a ‘catch’ clause
A method that might cause an exception, and each method in its chain

Question 61: The principle of bivalence says that the value assigned to a proposition that represents a simple declarative sentence. Which of the following can that sentence be?

‘null’
Unspecified
False or True
False and True

Question 62: Given propositions P and Q, when is R a valid deduction? P and Q ⇒ R

When it is not possible for P or Q to be true and R false
When it is not possible for P and Q to be true and R false
When it is not possible for P or Q to be false and R true
When it is not possible for P and Q to be false and R true

Question 63: Which of the following features of Java supports code reuse?

Objects
Network support
Memory management
Communication support

Question 64: Which of the following is a function of the JDK?

To test Java programs
To analyze Java programs
To compile Java programs
To document Java programs

Question 65: Which of the following features make object-oriented programming popular?

It promotes platform independence
It promotes program interdependence
It allows for encapsulation of data and procedures
It has greater execution efficiency compared to older paradigms

Question 66: Given the Java statement public static void main(String[] args), what are the reserved words in the statement?

public, static, String, void
args, public, static, String, void
main, public, static, String, void
args, main, public, static, String, void

Question 67: Which of the following is true about the import statement?

It can be anywhere in the Java source file
It makes the names of external classes visible
It includes external classes in a java source file
Together with *, it makes a class and subclasses visible

Question 68: What would the result of running int x += 1 be?

1
x
x+1
An error

Question 69: What would this code output after it is executed?

public class Practice {

public static void main(String[] args) {

String str = new String(“Technology to Engineering to Design”);

System.out.println(str.charAt(10));

}

y
null
blank
empty

Question 70: What would this code output after it is executed?

public class SystemFeature {

public static void main(String[] args) {

int label = 1;

switch (label) {

case 1:

System.out.println(“label 1”);

case 2:

System.out.println(“label 2”);

}

label 1
label 1
label 2
It would give a compile error
It would give a runtime error

Question 71: Which of the following correctly declares a one-dimensional array array1 that has 4 components?

int array1[4];
int[4] array1;
int[] array1 = new int[4];
int array1[] = new Array[4];

Question 72: Which of the following Java code snippets would print this table?

0 1

0 0 2

0 0 0 3

Answer: Option A

Question 73: You work for a car rental company. Car is a class whose objects represent rental cars, each having the following attributes: idCar and mileageCar have int type, and typeCar, modelCar, and statusCar have String type. StatusCar is either “in” or “out”, indicating whether the car is available for rent or is not. Let Car(String x, String y, int z, String w) be a constructor for this class, where x corresponds to type, y corresponds to model, z corresponds to mileage, and w corresponds to status. Assume that count is a class variable that is incremented each time a new Car is constructed, and is used to assign values to idCar. Assume mileageCar is initialized to 0. Assume inventory is an array of car objects. Which of the following code snippets would print a list of cars in the inventory that satisfy a condition or set of conditions?

Answer: Option D

Question 74: Which of the following tools would you use to input Java code into the JDK?

A text editor
The JRE interpreter
The JDK Java editor
Windows Visual Studio

Question 75: Which of the following does Java use to implement encapsulation?

Inheritance
Constructors
Polymorphism
Declaration keywords

Question 76: What would this code output after it is executed?

public class Try {

public static void main(String[] args) {

int x = 1, y = 2;

double xx = 1.0, yy = 2.0;

System.out.println(x > xx);

System.out.println(y == yy);

}

False
False
False
True
True
False
True
True

Question 77: A program consists of a sequence of various types of statements that process input data to produce output data. Each type of statement is used as part of a process, an input, or an output. How do control statements relate to each of these aspects?

They define the data that is stored
They change the data that is stored
They determine the order in which code is executed
They declare the name and type of data that is input

Question 78: Looping structures are included in most, if not all, programming languages. They are one of the earliest techniques for reusing code. Which of the following programming activities is likely to use loops?

Transacting an online bank deposit
Performing a computation specified by an equation
Selecting the next statement to execute based on a condition
Executing a block of code repetitively using different data values

Question 79: Which of the following is the correct call to the method that gets the length of the string “John”?

String str = “John”;

str.length();

String str = “John”;

String.length(str);

String str = new String(“John”);

length(str);

String str = new String(“John”);

String.length(str);

Question 80: You work for a car rental company. Suppose that inventory is an array that represents a set of cars available for rent, where each car has 3 components of information: type, model, and status. An example representation for a car is: “mid”, “Chv”, “in”, which represents a midsize Chevrolet and is in and available for rent. Which of the following code snippets would search the inventory for this car?

for (int row, col = 0; row < 100 and col < 3; row++) {

if (inventory[row][1] == “mid” &&

inventory[row][2] == “chv”);

}

for (int row, col = 0; row < 100 and col < 3; row++) {

if (inventory[row][col] == “mid” &&

inventory[row][col + 1] == “chv”);

}

for (int row, col = 0; col < 3 && row < 100; col++) {

if (inventory[col][row] == “mid” &&

inventory[col][2] == “chv”);

}

for (int row, col = 0; col < 3 && row < 100; col++) {

if (inventory[col][row] == “mid” &&

Inventory[col][row + 1] == “chv”);

}

Question 81: What would the result be when this code is executed and a user types mystring 123?

import java.util.Scanner;

import java.io.PrintWriter;

public class PrintSample {

public static void main(String[] args) {

Scanner sampleIn = new Scanner(System.in);

PrintWriter sampleOut = new PrintWriter(System.out, false);

String sIn = sampleIn.next();

System.out.println(sIn);

sampleOut.println(sIn);

System.out.println(“ok”);

int iIn = sampleIn.nextInt();

System.out.println(iIn);

sampleOut.close();

}

mystring

123

mystring

mystring

mystring

123

mystring

123

It would give an execution error

Question 82: What is the process in Java for creating and writing a text file?

define and allocate a file object

use the object’s write method to write string fields

use the object’s close method to close the file

construct a FileWriter object with a file name

use the objects write method to write character lines to the file

use the objects close method to close the file

declare a file name

construct a FileWriter object with that defined file name

use a FileWriter method to write string lines to the file

use a FileWriter method to close the file

define a file name

use the FileWriter open method to allocate a file with that name

use the FileWriter write method to write byte to that file

use the FileWriter close method to close the file

Question 83: In using the Scanner class for reading a text file, which of the following statements correctly describes the role of each of these classes?

Scanner methods can be used to read a text file
A File class object is attached to a Scanner object
A File class method can be used to check for end of file
Scanner.class methods do not throw file related checked exceptions

Question 84: Which of the following is a computer science principle that underlies the basic computer model?

Composition of detailed components
Decomposition into major components
Hierarchy of components and subcomponents
Language for forming instructions that control components

Question 85: Which of the following computer science principles underlies the programming life cycle?

Abstraction
Composition
Decomposition
Language

Question 86: You are using the Java Development Kit to write a simple program. Which of the following file types will you save the program as?

.html
.java
.jdoc
.txt

Question 87: In Java, a string is which of the following?

A class
An array
An object
A primitive data type

Question 88: What would this code output after it is executed?

public class Try {

public static void main(String[] args) {

boolean x = false, y = false;

if (x == y)

System.out.println(true);

else System.out.println(false);

}

True
False
It would give a syntax error
It would give a runtime error

Question 89: Which of the following Java logical expression is equivalent to NOT (A || B)?

A && !B
!A && B
!A && !B
!(A && B)

Question 90: What types of ‘if’ statements are there in Java?

‘do’ statements
‘do’ and ‘do – until’ statements
‘while’, ‘do – until’, and ‘for’ statements
‘while’, ‘do – while’, and ‘for’ statements

Question 91: Which of the following is common to all Java loops?

Conditions
Counters
Sentinels
Updaters

Question 92: You work at a car rental company. CarInventory.txt is a character file that contains rental car data. Each line contains a carId, carType, carModel, carMileage, and carStatus. Which of the following code snippets correctly reads this text file using the Scanner class? Assume the input text file exists.

Answers: Option A or B

Question 93: Which of the following is a key feature of Java?

Machine independence
Many low level facilities
An object model, like C++
Manual memory management

Question 94: Which of the following describes how computers can improve the processes involved in an information system?

They improve the performance of the process
They remove the people involved in the process
They generate ideas for how to streamline the process
They decrease the amount of data involved in the process

Question 95: Which of the following is the best definition of a primitive data-type?

A category of data that is part of the Java language
A user-defined class that declares a set of variables
A user-defined object that declares a set of identifiers
A piece of information needed by the Java Virtual Machine

Question 96: What would the value of x be after this code is executed?

float x = 1, y = 2;

x = x / 2;

0
0.5
1/2
1

Question 97: Modern programming languages contain Boolean types and Boolean operators (AND, OR, NOT) for constructing complex Boolean expressions that comprise a logical model. What do we call this model?

Propositional logic
First-order predicate logic
Second-order predicate logic
Higher-order predicate logic

Question 98: What would this code output after it is executed?

public class Main {

public static void main(String[] args) {

char[] array1 = {

‘a’,

‘b’,

‘c’

};

System.out.println(array1[0]);

}

a
‘a’
It would give a compile error
It would give a runtime error

Question 99: Which of the following minimal Java logical expressions has a meaning that is given by column C in this truth table?

A B C

0 0 0

0 1 1

1 0 0

1 1 1

A
B
(!A OR B ) AND (A OR !B)
(!A AND !B) OR (A AND !B)

Question 100: 5a.3. Which of the following is a control statement?

import java.util.*
long size = 1234567890;
System.out.println(“Hello world!”);
try {System.out.println(s.substring(start))};

Question 101: If C is the set of all coins, CQ is the set of all quarters, and Q is a 1904 quarter, which of the following is a correct statement?

C is an object
CQ is an object
CQ is a subclass of C
CQ is a parent of class C

Question 102: What would this code output after it is executed?

public class Main {

public static void main(String[] args) {

double decimalNumb = 1.1;

System.out.printf(“integer %d”, decimalNumb);

}

1.1
integer 1.1
It would give a run-time exception
It would give a compile format error

Question 103: Today’s computers are considered to be part of which computer hardware generation, which enabled larger software abstractions?

The second generation, which was characterized by transistors
The third generation, which was characterized by integrated circuits
The fourth generation, which was characterized by very-large-scale integration
The fifth generation, which was characterized by massive parallel hardware

Question 104: Which of the following methods would calculate the circumference of a circle (which is 2 times pi times the radius of the circle), starting with this given code?

public class Circle {

public double pi = 3.141592;

public double radius;

public Circle(double r) {

radius = r;

}

public double circum(r) {

double c;

return c = 2 * pi * radius;

};

public double circum(radius) {

double c = 2 * pi * radius;

};

public double circum() {

double c;

return c = 2 * pi * radius;

};

public void circum() {

double circum = 2 * pi * radius;

System.out.println(“arrived ” + circum);

};

Question 105: Given the Java statement class E extends class F, assuming E and F are different classes, what could most likely be said about the objects of E and F?

They have the same class data and behavior
They have different class data and behavior
They have the same class data and different behavior
They have different class data and the same behavior

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