CS1302 Test1

Which of the following are valid ways to start a Javadoc comment? Select all that apply. A) /** B) /* C) // D) #

A

package cs1302.exceptions; public class PhoneNumberParser{ public static void main(String[] args) { String phoneNumber = args[0]; // Expected format: ###-###-####int areaCode = 0, prefix = 0, lineNumber = 0; try { areaCode = Integer.parseInt(phoneNumber.substring(0,3)); prefix = Integer.parseInt(phoneNumber.substring(4,7)); lineNumber = Integer.parseInt(phoneNumber.substring(8, 12)); } catch (StringIndexOutOfBoundsException except) { System.out.println("Not long enough"); } catch (NumberFormatException exception) { System.out.println("Not a number"); } finally { System.out.println("Area code: " + areaCode); System.out.println("Prefix: " + prefix); System.out.println("Line Number: " + lineNumber); } // try } // main } // PhoneNumberParser What happens when the cs1302.exceptions.PhoneNumberParser program is run with 123-456-7eef for its command-line argument? Select all that apply. A) Outputs: Not a number B) Outputs: Area code: 123 Prefix: 456 Line Number: 0 C) Outputs: Not long enough D) Program crashes with an ArrayIndexOutOfBoundsException.

A, B

Which of the following can be used to open file1.txt and file2.txt in the Emacs text editor at the same time? Select all that apply. Unsure? Again, try it on Odin! A) Launch Emacs, then type the following set of commands: 1. C-x C-f file1.txt 2. C-x 2 3. C-x o 4. C-x C-f file2.txt B) Launch Emacs, then type the following set of commands: 1. C-x C-f file1.txt 2. C-x 3 3. C-x o 4. C-x C-f file2.txt C) Type the following command: $ emacs file1.txt file2.txt D) Type the following command: $ EMACS file2.txt file1.txt

A, B, C

public static Exception convert(Exception e) { String msg = e.getMessage(); NullPointerException npe = new NullPointerException(msg); return npe; } References of which of the following types can be supplied as an argument (i.e., an actual parameter) to this method? Select all that apply. A) NullPointerException B) IllegalArgumentException C) Exception D) Object

A, B, C

Which of the following types implement the Serializable interface? Select all that apply. A) java.lang.Exception B) java.lang.RuntimeException C) java.lang.Throwable D) java.lang.FileNotFoundException E) java.lang.Serializable F) java.lang.IOException G) java.lang.NullPointerException

A, B, C, D, F, G

src/cs1302/Product.java: package cs1302; public abstract class Product { protected int id; public Product(int id) { this.id = id; } // Product public int getId() { return id; } // getId } // Product src/cs1302/amazeon/Book.java: package cs1302.amazeon; import cs1302.Product; public class Book extends Product { private String author; public Book(int id, String author) { super(id); if (author != null) { this.author = author; } else { throw new NullPointerException("author cannot be null"); } // if } // Book public String getAuthor() { return author; } // getAuthor } // Book src/cs1302/googol/TechBook.java: package cs1302.googol; import cs1302.amazeon.Book; public class TechBook extends Book { private boolean code; public TechBook(int id, String author, boolean code) { super(id, author); this.code = code; } // TechBook } // TechBook Which of the following variables are contained within an object of type TechBook? Select all that apply. A) id B) code C) datePublished D) author E) name

A, B, D

Consider the following Java expression: Exception e = new SomeType(); Which of the following are valid replacements for SomeType in the expression? Select all that apply. You may assume proper imports. A) RuntimeException B) NullPointerException C) Throwable D) Exception E) FileNotFoundException F) IOException G) Serializable

A, B, D, E, F

src/cs1302/Product.java: package cs1302; public abstract class Product { protected int id; public Product(int id) { this.id = id; } // Product public int getId() { return id; } // getId } // Product src/cs1302/amazeon/Book.java: package cs1302.amazeon; import cs1302.Product; public class Book extends Product { private String author; public Book(int id, String author) { super(id); if (author != null) { this.author = author; } else { throw new NullPointerException("author cannot be null"); } // if } // Book public String getAuthor() { return author; } // getAuthor } // Book src/cs1302/googol/TechBook.java: package cs1302.googol; import cs1302.amazeon.Book; public class TechBook extends Book { private boolean code; public TechBook(int id, String author, boolean code) { super(id, author); this.code = code; } // TechBook } // TechBook Which of the following would be considered a syntacticly correct method implementation (i.e., it compiles) for a method, if included in the TechBook class? Consider each option independently. Select all that apply. A) public String getAuthor() { String name = super.getAuthor(); return name + " [TECH]"; } // getAuthor B) public String getAuthor() { return "[Tech Author]"; } // getAuthor C) @Override public String gettAuthor() { return super.getAuthor() + " [Tech Author]"; } // getAuthor D) public String gettAuthor() { return getAuthor() + " [Tech Author]"; } // getAuthor E) public String getAuthor(int pad) { String name = getAuthor(); return String.format("%" + pad + "s", name); } // getAuthor F) @Override public String getAuthor() { String name = super.getAuthor(); return "[Tech] " + name; } // getAuthor

A, B, D, E, F

Consider the following set of permissions for each class of user: User: read, execute Group: write, execute Other: read Which of these examples of the chmod command result in a mode that contains, but is not necessarily limited to, this set of permissions? Select all that apply. A) $ chmod 736 file1.txt B) $ chmod 665 file1.txt C) $ chmod u=rwx,g=wx,o=rx file1.txt D) $ chmod u=rx,g=rwx,o=wx file1.txt

A, C

Which of the following could be used to gain further insight into a command or command options that you are unfamiliar with? Select all that apply. A) try using --help as a command line argument B) use rel to list potentially related commands C) use man to read the related manual page D) use cd to order a compact disc or vinyl copy of someone dictating the command

A, C

Consider the following output for the jobs and ps commands, respectively: $ jobs [1]- Stopped spicy [2] Running spicy & [3]+ Stopped /usr/local/bin/emacs -nw $ ps PID TTY TIME CMD 72653 pts/8 00:00:01 spicy 72661 pts/8 00:00:08 spicy 72669 pts/8 00:00:00 emacs Which of these statements is true? Assume each option is independent. Select all that apply. A) $ fg %2 brings to the foreground the spicy program that is currently running in the background. B) $ fg 72669 brings to the foreground the emacs program that is currently suspended in the background. C) $ kill %1 terminates the spicy program that is currently suspended. D) $ kill -9 72653 72661 terminates the spicy program that is currently running in the background.

A, C, D

Interfaces in java can contain which of the following? Select all that apply. A) Static methods B) Instance variables C) Constants D) Abstract methods

A, C, D

Which of the following Java exception classes represent checked exceptions? Select all that apply. A) java.io.FileNotFoundException B) java.lang.ArrayIndexOutOfBoundsException C) java.nio.BufferOverflowException D) java.io.IOException

A, D

Which of the following are true about Git? Select all that apply. A) When you commit, Git takes files that are currently in the staging area and stores them in a new snapshot. B) Git is a Centralized Version Control System (CVCS) C) After a file is saved, it is automatically added to the staging area to be included in the next commit. D) When you clone a Git repository, you create a copy of the entire history of the repository on your local machine.

A, D

package cs1302.quiz6; public interface Movable { public void moveForward ( ); boolean turn ( double degrees ); } // Movable Assume we have two disparate classes, Turtle and Hare, which implement Movable but are otherwise unrelated. Which of the following are valid? Select all that apply. A) Movable h = new Hare(); B) Turtle t = new Movable(); C) Hare h = new Turtle(); D) Movable t = new Turtle();

A, D

package cs1302.quiz6; public interface Movable { public void moveForward ( ); boolean turn ( double degrees ); } // Movable Which of the following methods are syntactically correct implementation signatures of the turn method in a class that implements Movable? Ignore methods bodies when considering your response. Select all that apply. A) public boolean turn(){ ... } B) public boolean turn(double degrees){ ... } C) boolean turn(double degrees){ ... } D) public boolean turns(double degrees){ ... }

B

/*** Returns an {@code Image} object that can then be painted on the screen. * The {@code url} argument must specify an absolute {@link URL}. * The{@code name} argument is a specifier that is relative to the url argument. * <p> * This method always returns immediately, whether or not the image * exists. When this user interface attempts to draw the image on * the screen, the data will be loaded. The graphics primitives * that draw the image will incrementally paint on the screen. * * @param url an absolute URL giving the base location of the image * @param name the location of the image, relative to the url argument * @return the image at the specified URL * @see Image */ public Image getImage(URL url, String name) { try { return getImage(new URL(url, name)); } catch (MalformedURLException e) { return null; } // try } // getImage Which of the following statements about the code presented above is true? Select all that apply. A) The resulting HTML from running javadoc includes multiple sentences for this method in the Method Summary section. B) The resulting HTML from running javadoc includes documentation for all of the method's parameters. C) The resulting HTML from running javadoc formats the text associated with the @code and @link tags differently from the rest of the text. D) The line containing */ denotes the end of the Javadoc comment associated with the method.

B, C, D

src/cs1302/Product.java: package cs1302; public abstract class Product { protected int id; public Product(int id) { this.id = id; } // Product public int getId() { return id; } // getId } // Product src/cs1302/amazeon/Book.java: package cs1302.amazeon; import cs1302.Product; public class Book extends Product { private String author; public Book(int id, String author) { super(id); if (author != null) { this.author = author; } else { throw new NullPointerException("author cannot be null"); } // if } // Book public String getAuthor() { return author; } // getAuthor } // Book src/cs1302/googol/TechBook.java: package cs1302.googol; import cs1302.amazeon.Book; public class TechBook extends Book { private boolean code; public TechBook(int id, String author, boolean code) { super(id, author); this.code = code; } // TechBook } // TechBook Which of the following Java statements are valid? Assume the statements are in some method in a class directly in the cs1302.googol package that does not explicitly extend any class. You may safely assume that cs1302.Product and cs1302.amazeon.Book have been imported. Select all that apply. A) Book b = new Book(3, "Hawking"); System.out.println(b.id); B) TechBook e = new TechBook(3, "Gates", false); System.out.println(e.getAuthor()); C) Book b = new Book(3, "Hawking"); System.out.println(b.getId()); D) Product p = new Product(7); System.out.println(p.getId()); E) TechBook c = new Book(14, "Zuch"); System.out.println(c.getCode()); F) TechBook d = new TechBook(2, "Gates", false); System.out.println(d.getId());

B, C, F

Consider the class edu.uga.cs.Math and the following directory structure: project └── src └── edu └── uga └── cs └── Math.java What is the relative path of the default package for source code from inside the project directory? A) project/src B) src/uga/cs C) src D) ..

C

package cs1302.exceptions; public class PhoneNumberParser{ public static void main(String[] args) { String phoneNumber = args[0]; // Expected format: ###-###-####int areaCode = 0, prefix = 0, lineNumber = 0; try { areaCode = Integer.parseInt(phoneNumber.substring(0,3)); prefix = Integer.parseInt(phoneNumber.substring(4,7)); lineNumber = Integer.parseInt(phoneNumber.substring(8, 12)); } catch (StringIndexOutOfBoundsException except) { System.out.println("Not long enough"); } catch (NumberFormatException exception) { System.out.println("Not a number"); } finally { System.out.println("Area code: " + areaCode); System.out.println("Prefix: " + prefix); System.out.println("Line Number: " + lineNumber); } // try } // main } // PhoneNumberParser What happens when the cs1302.exceptions.PhoneNumberParser program is run with no command-line arguments? Select all that apply. A) Outputs: Not long enough B) Outputs: Not a number C) Program crashes with an ArrayIndexOutOfBoundsException. D) Outputs: Area code: 123 Prefix: 456 Line Number: 0

C

public static Exception convert(Exception e) { String msg = e.getMessage(); NullPointerException npe = new NullPointerException(msg); return npe; } What is the specific type of the reference value returned by this method? Select all that apply. A) NullPointerException B) IllegalArgumentException C) Exception D) Object

C

/*** Returns an {@code Image} object that can then be painted on the screen. * The {@code url} argument must specify an absolute {@link URL}. * The{@code name} argument is a specifier that is relative to the url argument. * <p> * This method always returns immediately, whether or not the image * exists. When this user interface attempts to draw the image on * the screen, the data will be loaded. The graphics primitives * that draw the image will incrementally paint on the screen. * * @param url an absolute URL giving the base location of the image * @param name the location of the image, relative to the url argument * @return the image at the specified URL * @see Image */ public Image getImage(URL url, String name) { try { return getImage(new URL(url, name)); } catch (MalformedURLException e) { return null; } // try } // getImage Assuming the code presented above is in the cs1302.images.Image class and the default package for source code is a subdirectory called src, which of the following commands will generate the API documentation website for the associated class and place it in a subdirectory called apidocs? Select all that apply. Feel free to try the various options on Odin to see what works and what doesn't work. A) $ javadoc -d apidocs --make-website *.java B) $ javadoc -d doc -sourcepath src -subpackages cs1302 C) $ javadoc -d apidocs src/cs1302/images/Image.java D) $ javadoc -d apidocs -sourcepath src -subpackages cs1302.images

C, D

Select a minimal number of command-line options used to produce the following output output for ls. Select all that apply. Not sure? Try it on Odin! total 16 drwxr-xr-x 2 mec grad 4096 Jan 8 14:56 . drwxr-xr-x 3 mec grad 4096 Jan 8 14:56 .. -rw-r--r-- 1 mec grad 11 Jan 8 14:56 README.txt -rw-r--r-- 1 mec grad 0 Jan 8 14:56 RickRoll.mp3 -rw-r--r-- 1 mec grad 16 Jan 8 14:56 TODO.txt A) -h B) -m C) -a D) -l

C, D

Which of these are valid ways to describe the permissions in the mode of file7.txt in symbolic form or binary after executing the following command? Select all that apply. $ chmod 711 file7.txt A) --x--xrwx B) 001001111 C) rwx--x--x D) 111001001

C, D

Consider the class edu.uga.cs.Fun and the following directory structure: project ├── dist │ └── bin │ └── edu │ └── uga │ └── cs │ └── Fun.class └── src └── edu └── uga └── cs └── Fun.java What is the compilation command used to reproduce the directory structure under dist if typed from inside the project directory? You may assume that the dist directory itself already exists and contains bin. Remember, you can recreate this directory structure on Odin to test the responses below. Just make sure you type the command from within the project directory. A) $ javac Fun.java B) $ javac -cp dist/bin src/edu/uga/cs/Fun.java C) $ java -d bin src/edu/uga/cs/Fun.java D) $ javac -d dist/bin src/edu/uga/cs/Fun.java

D

Suppose there is a driver class called game.Driver with a main method. Further suppose that the following code snippet is inside of the main method: Character zelda = new PlayableCharacter("Sheik", 9001); System.out.println(zelda.someVar); Which of the following are valid replacements for someVar in the snippet? Select all that apply. You may assume proper imports. A) exp B) width C) boss D) id E) image F) hp G) height H) name

D

public static Exception convert(Exception e) { String msg = e.getMessage(); NullPointerException npe = new NullPointerException(msg); return npe; } What is the type of the object referred to by the reference returned by this method? Select all that apply. A) IllegalArgumentException B) Exception C) Object D) NullPointerException

D

Suppose there is a driver class called game.Driver with a main method. Further suppose that the following code snippet is inside of the main method: Character yellowJacket = new NonPlayableCharacter("GTFan1337", false); Which of the following variables are contained in the memory allocated for the object referred to by yellowJacket in the snippet? Select all that apply. You may assume proper imports. A) exp B) width C) image D) hp E) height F) name G) id H) boss

D, F, G, H

cp <source> <destination>

copy source to destination

cp <source>.. <directory>

copy source(s) into directory

cat

display contents of a file to standard output

mkdir

make new directory (all intermediate directories must already exist)

mkdir -p

make new directory and any intermediate directories along the path that have not been created

CNTRL-b

move backward one character

OPT-b

move backward one word

CNTRL-f

move forward one character

OPT-f

move forward one word

mv <source>.. <destination>

move source(s) into directory (change dirname)

CNTRL-a

move to beginning of line

CNTRL-e

move to end of line

<command> --help

prints out info about what command does and what command line arguments the program supports

man <command>

prints the manual for given command

rm <path>

remove file

rm -r <path>

remove file and directory

mv <source> <destination>

rename source to destination (change basename)