Java Fundamentals Final Exam .docx

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Test: Java Fundamentals Final Exam

Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 4

(Answer all questions in this section)

1. In Eclipse, when you run a Java Application, where may the results display? Mark for Review

(1) Points

Editor Window Console View (*) Debug View Task List

None of the above Correct

2. What are the Eclipse Editor Area and Views used for? Mark for Review (1) Points

(Choose all correct answers) To modify elements. (*)

To navigate a hierarchy of information. (*)

To choose the file system location to delete a file. Correct

3. A combination of views and editors are referred to as _______________. Mark for Review

(1) Points A workspace A physical location A perspective (*) All of the above Correct

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4. In the image below, identify the components.

Mark for Review (1) Points

A-Main Method, B-Class, C-Package A-Class, B-MainMethod, C-Package A-Package, B-Main Method, C-Class (*) None of the above

Correct

5. A counter used in a For loop cannot be initialized within the For loop header. True or false? Mark for Review (1) Points

True False (*) Correct

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Section 4

6. In the code fragment below, the syntax for the for loop's initialization is correct. True or false?

public class ForLoop {

public static void main (String args[]) {

for ((int 1=10) (i<20) (i++))< {System.out.Println ("i: "+i); } }

}

Mark for Review (1) Points True

False (*) Correct

7. When importing another package into a class you must import only the package classes that will be called and not the entire package. True or false? Mark for Review (1) Points

8. Which of the two diagrams below illustrate the correct syntax for variables used in an if-else statement? Mark for Review (1) Points

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Example A (*) Example B Correct

9. What are Java's simple types? Mark for Review (1) Points boolean, byte, char, double, float, int, long, and short (*) boolean, byte, string, thread, int, double, long and short object, byte, string, char, float, int, long and short

boolean, thread, stringbuffer, char, int, float, long and short boolean, thread, char, double, float, int, long and short Correct

10. Select the declaration and initialization statement that will hold the letter J. Mark for Review

(1) Points int letter='J';

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float letter='J'; String letter='J'; char letter='J'; (*) Correct

Previous Page 2 of 10 Next Summary Test: Java Fundamentals Final Exam

Section 4

11. Which of the following are relational operators in Java? Mark for Review (1) Points

(Choose all correct answers) < (*)

<= (*) = != (*)

All of the above. Correct

12. What is the output of the following lines of code? int j=6,k=4,m=12,result;

result=j/m*k;

System.out.println(result); Mark for Review (1) Points 2

0 (*) 48 24

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13. Which of the following is the name of a Java primitive data type? Mark for Review (1) Points Object Rectangle double (*) String Correct

14. The three logic operators in Java are: Mark for Review (1) Points &&, ||, ! (*)

!=,=,== &&,!=,= &,|,=

Correct

15. The six relational operators in Java are: Mark for Review (1) Points >,<,=,!,<=,>=

>,<,==,!=,<=,>= (*) >,<,=,!=,<=,>= >,<,=,!=,=<,=> Correct

Section 5

16. All of the following are essential to initializing a FOR loop, except which one? Mark for Review

(1) Points

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Having a conditional statement. Updating the counter.

Having an if statement. (*) Correct

17. Updating the input of a loop allows you to implement the code with the next element rather than repeating the code always with the same element. True or false? Mark for Review (1) Points

True (*) False Correct

18. What is the output of the following code segment? int num = 7;

while(num >= 0) {

num -= 3; }

System.out.println(num); Mark for Review (1) Points -2 (*)

1 0 2

Correct

19. Why are loops useful? Mark for Review (1) Points They save programmers from having to rewrite code. They allow for repeating code a variable number of times. They allow for repeating code until a certain argument is met. All of the above. (*)

Incorrect. Refer to Section 5 Lesson 1.

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ThisClass t=new ThisClass(); int x=t.calculate(3,4); (*) int x=calculate(3,4);

ThisClass t=new ThisClass(); int x=t.calculate(3); ThisClass t=new ThisClass(); int x=t.calculate(); Incorrect. Refer to Section 5 Lesson 2.

Section 5

21. A class can only have one constructor. True or false? Mark for Review (1) Points

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Mark for Review (1) Points 31 32 10 11 (*) Correct

23. The following statement compiles and executes. What do you know for certain?

tree.grows(numFeet); Mark for Review (1) Points numFeet must be an int.

tree must be the name of the class.

grows must be the name of an instance field. grows must be the name of a method. (*) tree must be a method.

Correct

24. The following code creates an Object of type Animal. True or false? Animal a=new Animal(); Mark for Review (1) Points

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25. The following code creates an Object of type Horse. True or false? Whale a=new Whale(); Mark for Review (1) Points

Section 5

26. The following code is a good example of using the this reference. True or false?

Mark for Review (1) Points True

False (*) Correct Section 6

27. The following array declaration is valid. True or false? int[] y = new int[5]; Mark for Review (1) Points

28. What is the output of the following segment of code? Mark for Review (1) Points

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456789 777777 (*) 555555 987654

This code doesn't compile. Correct

29. Which of the following statements is not a valid array declaration? Mark for Review (1) Points int number[]; float []averages; double marks[5]; counter int[]; (*)

30. What is the output of the following segment of code? int array[][] = {{1,2,3},{3,2,1}};

for(int i=0;i<2;i++) for(int j=0;j<3;j++)

System.out.print(2*array[1][1]); Mark for Review (1) Points 444444 (*)

123321 246642 222222

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Correct

Previous Page 6 of 10 Next Summary

Section 6

31. Consider the following code snippet String forest = new String("Black"); System.out.println(forest.length());

What is printed? Mark for Review (1) Points 5 (*) 6 7 Black Forest Correct

32. Which of the following creates a String named Char? Mark for Review (1) Points char string; String Char; (*) char Char; char char; String char; Correct

33. The following code is an example of a correct initialization statement: char c="c"; Mark for Review (1) Points

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False (*) Correct

34. The == operator can be used to compare two String objects. The result is always true if the two strings are have the exact same characters in each position of the String. True or false? Mark for Review (1) Points

35. Which of the following could be a reason to throw an exception? Mark for Review

(1) Points

To eliminate exceptions from disrupting your program. (*) You have a fatal error in your program.

You have encountered a Stack Overflow Error. To make the user interface harder to navigate. Correct

Previous Page 7 of 10 Next Summary

Section 6

36. Which of the following correctly matches the symbol with its function? Mark for Review

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(Choose all correct answers)

== (two equal signs) compares values of primitive types such as int or char. (*)

== (two equal signs) compares the values of non-primitive objects.

== (two equal signs) compares the memory location of non-primitive objects. (*)

= (single equals sign) compares the value of primitive types such as int or char.

.equals() compares the value of non-primitive objects. (*)

Correct

37. If an exception is thrown by a method, where can the catch for the exception be? Mark for Review

(1) Points

There does not need to be a catch in this situation.

The catch must be in the method that threw the exception.

The catch can be in the method that threw the exception or in any other method that called the method that threw the exception. (*)

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The catch must be immediately after the throw.

38. Suppose you are writing a program where the user is prompted to the give coordinates where they believe the princess is inside of the castle.

Your program moves the prince to the coordinates that the user specified. If the princess is not found at those coordinates, the user is given a clue that helps them guess coordinates closer to the princess. The user is allowed to enter their new guess of where the princess is.

Assume your program does not take into consideration the possibility that the user may enter coordinates outside of the castle where the princess could not be. What would be the result of the user entering coordinates outside of the castle? How could this be handled in your code? Mark for Review

(1) Points

An error would occur. Errors cannot be handled by code.

An exception would occur but could not be handled inside your code. The user would have to restart the program and enter proper coordinates.

An exception would occur. This could be handled by throwing the exception in your code if the user enters invalid coordinates. When the exception is caught, the prince could be moved to the coordinate inside the castle that is closest to those that the user specified. (*)

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An exception would occur. This could be handled by throwing an exception in your code if the user enters invalid coordinates. When the exception is caught, the user could be prompted to enter coordinates within the given range of the castle. (*)

Section 7

39. An access modifier is a keyword that allows subclasses to access methods, data, and constructors from their parent class. True or false? Mark for Review (1) Points

True (*) False

40. Which of the following is the correct way to call an overriden method needOil() of a super class Robot in a subclass SqueakyRobot? Mark for Review (1) Points

Robot.needOil(SqueakyRobot); SqueakyRobot.needOil(); super.needOil(); (*) needOil(Robot);

Incorrect. Refer to Section 7 Lesson 3. Previous Page 8 of 10 Next Summary

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41. What is the Java Applet? Mark for Review (1) Points (Choose all correct answers)

It is the virtual machine that translates Java code into a representation that the computer can understand.

A web-based Java program that is embedded into a web browser. (*) A graphic visual included in Java. (*)

There is no such thing as a Java Applet. Incorrect. Refer to Section 7 Lesson 3.

42. Which segment of code represents a correct way to define a variable argument method? Mark for Review (1) Points

String easyArray(String... elems) {//code} (*) String easyArray(...String elems) {//code} String... easyArray(String elems) {//code} Integer easyArray... (int elems) {//code} Correct

43. Which of the following is the correct way to code a method with a return type an object Automobile? Mark for Review (1) Points

Automobile upgrade(String carA){ carA="Turbo";

return carA;}

Automobile upgrade(Automobile carA){ carA.setTurbo("yes");

return carA;} (*)

String upgrade(String carA){ carA="Turbo";

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upgrade(Automobile carA) Automobile{ carA.setTurbo("yes");

return carA;}

None of the above. It is not possible to return an object. Correct

44. Choose the correct implementation of a public access modifier for the method divide. Mark for Review (1) Points

divide(int a, int b, public) {return a/b;} public divide(int a, int b) {return a/b;} (*) divide(int a, int b) {public return a/b;}

divide(public int a, public int b) {return a/b;} Correct

45. Static methods can read instance variables. True or false? Mark for Review (1) Points

Section 7 (Answer all questions in this section)

46. Static methods can write to class variables. True or false? Mark for Review (1) Points

True (*) False

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47. A static variable is always publicly available. True or false? Mark for Review (1) Points

48. Abstract classes cannot implement interfaces. True or false? Mark for Review (1) Points

True False (*)

49. If Oak extends Tree, it is possible to declare an object such that Tree grandfatherT = new Oak();

True or false? Mark for Review (1) Points True (*)

False Correct

50. Abstract class cannot extend another abstract class. True or false? Mark for Review

(1) Points True False (*) Correct

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Section 4

1. The six relational operators in Java are: Mark for Review (1) Points >,<,=,!,<=,>= >,<,==,!=,<=,>= (*) >,<,=,!=,<=,>= >,<,=,!=,=<,=> Correct

2. The three logic operators in Java are: Mark for Review (1) Points &&, ||, ! (*) !=,=,== &&,!=,= &,|,= Correct

3. What does the following program output?

Mark for Review (1) Points total cost: + 40 total cost: 48 total cost: 40 (*) "total cost: " 48 "total cost: " 40

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4. Which line of Java code will assign the square root of 11 to a? Mark for Review (1) Points double a=11^(1/2); double a=sqrt(11); int a=Math.sqrt(11); double a=Math.sqrt*11; double a=Math.sqrt(11); (*) Correct

5. What two values can a boolean variable have? Mark for Review (1) Points Numbers and characters

True and false (*)

Relational and logic operators Arithmetic and logic operators Integers and floating point types Correct

Page 1 of 10 Next Summary Test: Java Fundamentals Final Exam Section 4

6. Given the following declaration, which line of Java code properly casts one type into another without data loss?

int i=3,j=4; double y=2.54; Mark for Review (1) Points int x=(double)2.54;

double x=i/j;

double x=(double)(i/j); double x= double i/j;

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double x=(double)i/j; (*) Correct

7. Which of the following is a legal identifier? Mark for Review (1) Points 7up boolean grand Total apple (*) Correct

8. In a For loop the counter is not automatically incremented after each loop iteration. Code must be written to increment the counter. True or false? Mark for Review (1) Points

True (*) False

9. When the For loop condition statement is met the construct is exited. True or false? Mark for Review (1) Points

True False (*)

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10. Which of the two diagrams below illustrate the general form of a Java program?

Example A Example B (*) Correct

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Previous Page 2 of 10 Next Summary Test: Java Fundamentals Final Exam Section 4

11. A counter used in a For loop cannot be initialized within the For loop header. True or false? Mark for Review (1) Points

12. When you open more than one file in Eclipse the system will __________________. Mark for Review (1) Points

Close the previously opened file. Use tabs to display all files open. (*)

Put the new file opened in a View area only. None of the above.

(1) Points A workspace A physical location A perspective (*) All of the above

14. In Eclipse, when you run a Java Application, where may the results display? Mark for Review

(1) Points

Editor Window Console View (*)

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Debug View Task List

15. What are the Eclipse Editor Area and Views used for? Mark for Review (1) Points

(Choose all correct answers) To modify elements. (*)

To choose the file system location to delete a file. Correct

Section 5

16. Which of the following best describes a WHILE loop? Mark for Review (1) Points

A loop that contains a segment of code that is executed before the conditional statement is tested.

A loop that executes the code at least one time even if the conditional statement is false.

A loop that is executed repeatedly until the conditional statement is false. (*) A loop that contains a counter in parenthesis with the conditional statement. Correct

17. Switch statements work on all input types including, but not limited to, int, char, and String. True or false? Mark for Review (1) Points

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They save programmers from having to rewrite code. They allow for repeating code a variable number of times. They allow for repeating code until a certain argument is met. All of the above. (*)

Correct

19. Which of the following correctly matches the switch statement keyword to its function? Mark for Review (1) Points

switch: tells the compiler the value to compare the input against

default: signals what code to execute if the input does not match any of the cases (*)

case: signals what code is executed if the user input matches the specified element (*)

if: records the user's input and sends it to the case statements to find a possible match

switch: identifies what element will be compared to the element of the case statements to find a possible match (*)

Correct

20. What is wrong with the following class declaration? class Account{ ;

privateint number; privateString name;; Account;;

}

Classes cannot include strings.

Classes cannot include mixed data types. The constructor method has no definition. (*)

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There is nothing wrong. Correct

Section 5

21. Which of the following may be part of a class definition? Mark for Review (1) Points

Instance variables Instance methods Constructors

All of the above. (*) None of the above.

22. The constructor method must always have at least one parameter. True or false? Mark for Review (1) Points

23. A constructor must have the same name as the class it is declared within. True or false? Mark for Review (1) Points

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24. The basic unit of encapsulation in Java is the primitive data type. True or false? Mark for Review (1) Points

25. In Java, an instance field referenced using the this keyword generates a compilation error. True or false? Mark for Review (1) Points

Section 5

26. A constructor is used to create objects. True or false? Mark for Review (1) Points

True (*) False Correct Section 6

27. Which of the following statements adds all of the elements of the one dimensional array prices and then prints it to the screen? Mark for Review (1) Points

a) for(int i=0;i<prices.length;i++) System.out.println(prices[i]+1); b) System.out.println(prices); c) int total

for(int i=1;i total+=prices[i]; System.out.println(total); (*)

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d) int total=0;

for(int i=1;i total+=prices[i];

28. The following array declaration is valid. True or false? int[] y = new int[5]; Mark for Review (1) Points

29. Which of the following statements is not a valid array declaration? Mark for Review (1) Points int number[]; float []averages; double marks[5]; counter int[]; (*)

30. What is the output of the following segment of code? int num[]={9,8,7,6,5,4,3,2,1};

for(int i=0;i<9;i=i+3)

System.out.print(num[i]); Mark for Review (1) Points

9630 963 (*) 987654321 97531

This code doesn't compile. Correct

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Section 6

31. Consider the following code snippet.

What is printed? Mark for Review (1) Points 88888 (*)

88888888 1010778

101077810109

ArrayIndexOutofBoundsException is thrown

32. The following code is an example of instantiating a String object: String str = String( "Hello" );

True or false? Mark for Review (1) Points True

False (*)

33. Suppose that str1 and str2 are two strings. Which of the statements or expressions are valid? Mark for Review (1) Points

String str3 = str1 - str2; str1 += str2; (*)

str1 >= str2 Str1 -= str2; Correct

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34. The == operator tests if two String references are pointing to the same String object. True or false? Mark for Review (1) Points

35. What does it mean to catch an exception? Mark for Review (1) Points It means you have fixed the error.

It means to throw it. It means to handle it. (*)

It means there was never an exception in your code. Correct

Section 6

36. A logic error occurs if an unintentional semicolon is placed at the end of a loop initiation because the interpreter reads this as the only line inside the loop, a line that does nothing. Everything that follows the semicolon is interpreted as code outside of the loop. True or false? Mark for Review (1) Points

True False (*)

37. Which of the following correctly matches the symbol with its function? Mark for Review

(1) Points

== (two equal signs) compares values of primitive types such as int or char. (*)

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== (two equal signs) compares the memory location of non-primitive objects. (*)

= (single equals sign) compares the value of primitive types such as int or char.

.equals() compares the value of non-primitive objects. (*) Incorrect. Refer to Section 6 Lesson 3.

38. What is wrong with this code?

Mark for Review (1) Points It is missing a semicolon.

It does not handle the exception.

It gives you an out of bounds exception. There is nothing wrong with this code. (*) Correct

Section 7

39. Identify the correct way to declare an abstract class. Mark for Review (1) Points

abstract public class ClassName{...} public abstract ClassName(...)

public class abstract ClassName(...) public abstract class ClassName{...} (*) Correct

40. Which of the following are true about abstract methods? Mark for Review (1) Points

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They must be overridden in a non-abstract subclass. (*) They must be declared in an abstract class. (*)

They may contain implementation. They must be overloaded.

Correct

Section 7

41. What is true about the Object class? Mark for Review (1) Points (Choose all correct answers)

It is the highest superclass. (*) It extends other classes.

Its methods can be overridden in subclasses. (*) Its methods can be overloaded in subclasses. (*) Correct

42. An access modifier is a keyword that allows subclasses to access methods, data, and constructors from their parent class. True or false? Mark for Review (1) Points

43. Which of the following correctly describes an Is-A relationship? Mark for Review

(1) Points

A helpful term used to conceptualize the relationships among nodes or leaves in an inheritance hierarchy. (*)

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A programming philosophy that promotes simpler, more efficient coding by using exiting code for new applications.

It restricts access to a specified segment of code.

A programming philosophy that promotes protecting data and hiding implementation in order to preserve the integrity of data and methods. Correct

44. If a variable in a superclass is private, could it be directly accessed or modified by a subclass? Why or why not? Mark for Review (1) Points Yes. A subclass inherits full access to all contents of its super class. Yes. Any variable passed through inheritance can be changed, but private methods cannot.

No. A private variable can only be modified by the same class with which it is declared regardless of its inheritance. (*)

No. Nothing inherited by the super class can be changed in the subclass. Correct

45. Which of the following are access specifiers? Mark for Review (1) Points (Choose all correct answers)

protected (*) public (*) secured

default (no access modifier) (*) private (*)

Correct

Section 7

46. Which of the following correctly defines overloading? Mark for Review (1) Points

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Having more than one constructor with the same name but different arguments. (*)

Having more than one constructor with different names and the same arguments.

A variable argument method that returns an array.

A type of access specifier that only allows access from inside the same class. Correct

47. Which of the following is the correct way to code a method with a return type an object Automobile? Mark for Review (1) Points

a) Automobile upgrade(String carA){ carA="Turbo";

return carA;}

b) Automobile upgrade(Automobile carA){ carA.setTurbo("yes");

return carA;} (*)

c) String upgrade(String carA){ carA="Turbo";

return carA;}

d) upgrade(Automobile carA) Automobile{ carA.setTurbo("yes");

return carA;}

None of the above. It is not possible to return an object. Correct

48. Static methods can't act like "setter" methods. True or false? Mark for Review

(1) Points True False (*)

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49. Static classes are designed as thread safe class instances. True or false? Mark for Review

(1) Points True False (*) Correct

50. Static methods can read instance variables. True or false? Mark for Review (1) Points

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1. What are Java's simple types?

boolean, byte, char, double, float, int, long, and short (*) boolean, byte, string, thread, int, double, long and short

object, byte, string, char, float, int, long and short

boolean, thread, stringbuffer, char, int, float, long and short boolean, thread, char, double, float, int, long and short

2. Which of the following are relational operators in Java? (Choose all correct answers) < (*)

<= (*) = != (*)

All of the above.

3. What is the output of the following lines of code? int j=6,k=4,m=12,result; result=j/m*k; System.out.println(result); 2 0 (*) 48 24

4. A local variable has precedence over a global variable in a Java method. True or false? True (*) False

total cost: + 40 total cost: 48

total cost: 40 (*) "total cost: " 48 "total cost: " 40

6. What is the result when the following code segment is compiled and executed? int x = 22, y = 10;

double p = Math.sqrt( ( x + y ) /2); System.out.println(p);

Syntax error "sqrt(double) in java.lang.Math cannot be applied to int" 4.0 is displayed (*)

2.2 is displayed

5.656854249492381 is displayed ClassCastException

7. Determine whether this boolean expression evaluates to true or false: !(3<4&&6>6||6<=6&&7-2==6)

True (*) False

8. In an if-else construct the condition to be evaluated must end with a semi-colon. True or false? True False (*)

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9. Which of the two diagrams below illustrate the general form of a Java program? Example A

Example B (*)

10. In a For loop the counter is not automatically incremented after each loop iteration. Code must be written to increment the counter. True or false?

True (*) False

11. When the For loop condition statement is met the construct is exited. True or false?

True False (*)

12. You can return to the Eclipse Welcome Page by choosing Welcome from what menu? File

Edit Help (*) Close

13. In Eclipse, when you run a Java Application, where may the results display? Editor Window

Console View (*) Debug View Task List

None of the above

14. A combination of views and editors are referred to as _______________. A workspace

A physical location A perspective (*) All of the above

15. What are the Eclipse Editor Area and Views used for?(Choose all correct answers) To modify elements. (*)

To navigate a hierarchy of information. (*) To choose the file system location to delete a file.

16. What is the output of the following code segment: int n = 13;

System.out.print(doNothing(n)); System.out.print(" ", n);

where the code from the function doNothin is: public double doNothing(int n)

{ n = n + 8; return (double) 12/n; } 1.75, 13 0.571, 21 1.75, 21

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0.571, 13 (*)

17. Updating the input of a loop allows you to implement the code with the next element rather than repeating the code always with the same element. True or false?

True (*) False

18. One advantage to using a WHILE loop over a FOR loop is that a WHILE loop always has a counter. True or false? True False (*)

19. Which of the following could be a reason to use a switch statement in a Java program? Because it allows the code to be run through until a certain conditional statement is true.

Because it allows the program to run certain segments of code and neglect to run others based on the input given. (*)

Because it terminates the current loop.

Because it allows the user to enter an input in the console screen and prints out a message that the user input was successfully read in.

20. In Java, an instance field referenced using the this keyword generates a compilation error. True or false?

True False (*)

21. Consider

public class YourClass{ public YourClass(int i){/*code*/} // more code...} To instantiate YourClass, what would you write?

YourClass y = new YourClass(); YourClass y = new YourClass(3); (*) YourClass y = YourClass(3); YourClass y = YourClass(); None of the above.

22. A constructor must have the same name as the class it is declared within. True or false? True (*) False

23. Which of the following keywords are used to control access to the member of a class? default

public (*) class

All of the above. None of the above.

24. Which of the following creates a method that compiles with no errors in the class?

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All of the above. None of the above

25. The following code creates an Object of type Horse. True or false? Whale a=new Whale();

True False (*)

26. What operator do you use to call an object's constructor method and create a new object? +

new (*) instanceOf

27. Which of the following declares a one dimensional array name scores of type int that can hold 14 values?

int scores;

int[] scores=new int[14]; (*) int[] scores=new int[14]; int score= new int[14]

28. Which of the following statements is not a valid array declaration? int number[];

float []averages;

double marks[5]; counter int[]; (*)

29. What is the output of the following segment of code if the command line arguments are "a b c d e f"? 1

3 5 6 (*)

30. Which of the following declares a one dimensional array named names of size 8 so that all entries can be Strings?

String names=new String[8]; String[] name=new Strings[8]; String[] names=new String[8]; (*) String[] name=String[8];

31. What will the following code segment output? String s="\\\\\ System.out.println(s); "\\\\\" \\\\\\\\ \\ \\\\ (*)

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What is printed? Mark for Review (1) Points 88888 (*) 88888888 1010778 101077810109 ArrayIndexOutofBoundsException is thrown

33. Given the code String s1 = "abcdef"; String s2 = "abcdef"; String s3 = new String(s1);

Which of the following would equate to false? s1 == s2

s1 = s2 s3 == s1 (*) s1.equals(s2) s3.equals(s1)

34. How would you use the ternary operator to rewrite this if statement? if (balance < 500) fee = 10; else fee = 0; fee = ( balance < 500) ? 0 : 10; fee= ( balance < 500) ? 10 : 0; (*) fee = ( balance >= 5) ? 0 : 10; fee = ( balance >= 500) ? 10 : 0; fee = ( balance > 5) ? 10 : 0;

35. If an exception is thrown by a method, where can the catch for the exception be? There does not need to be a catch in this situation.

The catch must be in the method that threw the exception.

The catch can be in the method that threw the exception or in any other method that called the method that threw the exception. (*)

The catch must be immediately after the throw.

36. Choose the best response to this statement: An error can be handled by throwing it and catching it just like an exception.

True. Errors and exceptions are the same objects and are interchangeable.

False. An error is much more severe than an exception and cannot be dealt with adequately in a program. (*

True. Although errors may be more severe than exceptions they can still be handled in code the same way exceptions are. False. Exceptions are caused by a mistake in the code and errors occur for no particular reason and therefore cannot be handled or avoided.

(43)

To eliminate exceptions from disrupting your program. (*) You have a fatal error in your program.

You have encountered a Stack Overflow Error. To make the user interface harder to navigate.

38. Suppose you misspell a method name when you call it in your program. Which of the following explains why this gives you an exception?

Because the parameters of the method were not met.

Because the interpreter does not recognize this method since it was never initialized, the correct spelling of the method was initialized.

Because the interpreter tries to read the method but when it finds the method you intended to use it crashes.

This will not give you an exception, it will give you an error when the program is compiled. (*)

39. Which of the following is the correct way to call an overriden method needOil() of a super class Robot in a subclass SqueakyRobot?

40. Why are hierarchies useful for inheritance? They keep track of where you are in your program. They restrict a superclass to only have one subclass.

They organize constructors and methods in a simplified fashion.

They are used to organize the relationship between a superclass and its subclasses. (*) 41. It is possible for a subclass to be a superclass. True or false?

True (*) False

42. Static methods can write to instance variables. True or false?

True False (*)

43. Static classes are designed as thread safe class instances. True or false?

True False (*)

44. Public static variables can't have their value reset by other classes. True or false? True False (*)

45. Choose the correct implementation of a public access modifier for the method divide. divide(int a, int b, public) {return a/b;}

public divide(int a, int b) {return a/b;} (*) divide(int a, int b) {public return a/b;} divide(public int a, public int b) {return a/b;}

46. Which of the following specifies accessibility to variables, methods, and classes? Methods

Parameters

(44)

Access specifiers (*)

47. Which segment of code represents a correct way to call a variable argument method counter that takes in integers as its variable argument parameter?

counter(String a, int b); counter(int[] numbers); counter(1, 5, 8, 17, 11000005); (*)

counter("one","two",String[] nums);

48. Which of the following can be declared final? Classes

Methods Local variables Method parameters All of the above (*)

49. Which of the following would be most beneficial for this scenario?

Joe is a college student who has a tendency to lose his books. Replacing them is getting costly. In an attempt to get organized, Joe wants to create a program that will store his textbooks in one group of books, but he wants to make each book type the subject of the book (i.e. MathBook is a book). How could he store these different subject books into a single array?

By ignoring the subject type and initializing all the book as objects of type Book. By overriding the methods of Book.

Using polymorphism. (*)

This is not possible. Joe must find another way to collect the books. 50. What is Polymorphism?

A way of redefining methods with the same return type and parameters. A way to create multiple methods with the same name but different parameters. A class that cannot be initiated.

The concept that a variable or reference can hold multiple types of objects. (*)

1. What is the purpose of the Eclipse Editor Area and Views? Mark for Review (1) Points

(45)

To choose the file system location to delete a file.

[Correct] Correct

2. When converting gallons to liters its best to put the

calculation result into a variable with a _______________ data type. Mark for Review

(1) Points

int

double (*)

boolean

(46)

[Correct] Correct

3. A workspace is: Mark for Review (1) Points

The physical location onto which you will store and save your files.

The location where all projects are developed and modified.

The location where you can have one or more stored perspectives.

All of the above. (*)

[Incorrect] Incorrect. Refer to Section 4 Lesson 1.

(1) Points

(47)

A physical location

A perspective (*)

All of the above

[Correct] Correct

5. A workspace can not have more than one stored projects. True or false? Mark for Review

(1) Points

True

False (*)

[Correct] Correct

(48)

(1) Points

Numbers and characters

True and false (*)

Relational and logic operators

Arithmetic and logic operators

Integers and floating point types

[Correct] Correct

(49)

total cost: + 40 total cost: 48 total cost: 40 (*) "total cost: " 48 "total cost: " 40 [Correct] Correct

8. Which of the following instantiates a String named name to Oracle? Mark for Review

(1) Points

String name;

(50)

String name="name";

String name="Oracle"; (*)

[Correct] Correct

9. Given the code

String s1 = "abcdef"; String s2 = "abcdef"; String s3 = new String(s1);

Which of the following would equate to false? Mark for Review (1) Points

s1 == s2

(51)

s3 == s1 (*)

s1.equals(s2)

s3.equals(s1)

Test: Java Fundamentals Final Exam

Section 4

1. Which of the following declarations are correct?

double duty; (*) float loan; (*) boolean value = 12; int start = 34, 3nd = 99;

Correct

2. Which line of Java code will assign the value of the square root of 11 to a variable named a?

double a=11^(1/2); double a=sqrt(11); int a=Math.sqrt(11); double a=Math.sqrt*11; double a=Math.sqrt(11); (*) Correct

(52)

3. The ______________ is the location into which you will store and save your files.

Perspective Workspace (*) Editor

4. A workspace is:

The physical location onto which you will store and save your files. The location where all projects are developed and modified. The location where you can have one or more stored perspectives. All of the above. (*)

Correct

5. A workspace can not have more than one stored projects. True or false?

True False (*)

Correct

Page 1 of 10

_Next

_Summary

Section 4

6. You can return to the Eclipse Welcome Page by choosing Welcome from what menu?

File Edit

(53)

Help (*) Close

Correct 7. A perspective is described as:

A combination of views and editors (*) A combination of views and windows A combination of editor tabs

None of the above

8. Which of the following defines a driver class?

Contains a main method and other static methods. (*) Contains classes that define objects.

Contains a main method, a package, static methods, and classes that define objects. None of the above.

Incorrect. Refer to Section 4 Lesson 2. 9. Which of the following defines an object class?

Contains a main method and other static methods. Contains classes that define objects. (*)

Contains a main method, a package, static methods, and classes that define objects. None of the above.

Correct 10. Consider the following code snippet.

(54)

What is printed? 88888 (*) 88888888 1010778 101077810109 ArrayIndexOutofBoundsException is thrown Incorrect. Refer to Section 4 Lesson 4.

_Next

_Summary

Section 4

11. Consider the following code snippet.

What is printed? Cayrbniz CayrbnizCayrbniz yr (*) ay ArrayIndexOutofBoundsException is thrown Incorrect. Refer to Section 4 Lesson 4. 12. Given the code:

String s = new String("abc");

Which of the following statements will change the length of s to the largest length? s.trim()

(55)

s.replace("a", "aa") s.substring(2) s.toUpperCase()

None of the above will change the length of s. (*) Correct

13. What is printed by the following code segment?

\\\\ \\\\\\\ (*) \\\\\\\\\\\\\\ \\

Correct

14. The following code is an example of creating a String reference: String s; True or false? True (*) False Correct Section 5

15. How many times will the following loop be executed? What is the value of x after the loop has finished? What is the value of count after the loop has finished? int count = 17; int x = 1; while(count > x){ x*=3; count-=3; } 4; 8; 27 3; 27; 8 (*)

(56)

5; 27; 8 5; 30; 5 3; 9; 11

Correct

Next Summary

Section 5

16. One advantage to using a while loop over a for loop is that a while loop always has a counter. True or false?

True False (*)

17. Updating the input of a loop allows you to implement the code with the next element rather than repeating the code always with the same element. True or false?

True (*) False

Correct

18. Which of the following could be a reason to use a switch statement in a Java program?

Because it allows the code to be run through until a certain conditional statement is true.

Because it allows the program to run certain segments of code and neglect to run others based on the input given. (*) Because it terminates the current loop.

Because it allows the user to enter an input in the console screen and prints out a message that the user input was successfully read in. Correct

19. Determine whether this boolean expression evaluates to true or false: !(3<4&&6>6||6<=6&&7-2==6)

(57)

True (*) False

Incorrect. Refer to Section 5 Lesson 1. 20. How would you use the ternary operator to rewrite this if statement?

if (balance < 500)< fee = 10; else fee = 0; fee = ( balance < 500) ? 0 : 10; fee= ( balance < 500) ? 10 : 0; (*) fee = ( balance >= 5) ? 0 : 10; fee = ( balance >= 500) ? 10 : 0; fee = ( balance > 5) ? 10 : 0;

_Next

_Summary

Section 6

21. Which of the following declares a one dimensional array name scores of type int that can hold 14 values?

int scores;

int[] scores=new int[14]; (*) int[] scores=new scores int[14]; int score= new int[14];

22. What is the output of the following segment of code? int array[][] = {{1,2,3},{3,2,1}}; for(int i=0;i<2;i++) for(int j=0;j<3;j++) System.out.print(2*array[1][1]); 444444 (*) 123321

(58)

246642 222222

This code doesn't compile.

23. Which of the following declares and initializes a one dimensional array that can hold 5 Object reference types?

String[] array=new String[5]; Object array=new Object[5]; (*) Object[] array=new Object[4]; String[] array=String[4];

Incorrect. Refer to Section 6 Lesson 1. 24. Which of the following statements is not a valid array declaration?

int number[]; float []averages; double marks[5]; counter int[]; (*)

Correct

25. Which of the following is a sorting algorithm that involves repeatedly incrementing through the array and swapping 2 adjacent values if they are in the wrong order until all elements are in the correct order?

Selection Sort Merge Sort Bubble Sort (*) Sequential Search Binary Search

Next Summary

(59)

26. Which of the following is the correct lexicographical order for the conents of the int array? {17, 1, 1, 83, 50, 28, 29, 3, 71, 22} {71, 1, 3, 28,29, 50, 22, 83, 1, 17} {83, 71, 50, 29, 28, 22, 17, 3, 1, 1} {1, 1, 17, 22, 28, 29, 3, 50, 71, 83} {1, 2, 7, 0, 9, 5, 6, 4, 8, 3} {1, 1, 3, 17, 22, 28, 29, 50, 71, 83} (*) Correct

27. Which searching algorithm involves using a low, middle, and high index value to find the location of a value in a sorted set of data (if it exists)?

Sequential Search Merge Sort Selection Sort Binary Search (*) All of the above

28. Big-O Notation is used in Computer Science to describe the performance of Sorts and Searches on arrays. True or false?

True (*) False

29. A logic error occurs if an unintentional semicolon is placed at the end of a loop initiation because the interpreter reads this as the only line inside the loop, a line that does nothing. Everything that follows the semicolon is interpreted as code outside of the loop. True or false?

True False (*)

Correct

(60)

30. If a variable in a superclass is private, could it be directly accessed or modified by a subclass? Why or why not?

Yes. A subclass inherits full access to all contents of its super class.

Yes. Any variable passed through inheritance can be changed, but private methods cannot.

No. A private variable can only be modified by the same class with which it is declared regardless of its inheritance. (*) No. Nothing inherited by the super class can be changed in the subclass.

Correct

Next Summary

Section 7

31. Which of the following is the correct way to call an overriden method needOil() of a super class Robot in a subclass SqueakyRobot?

32. An access modifier is a keyword that allows subclasses to access methods, data, and constructors from their parent class. True or false?

True (*) False

Correct 33. What is encapsulation?

A keyword that allows or restricts access to data and methods.

(61)

A structure that categorizes and organizes relationships among ideas, concepts of things with the most general at the top and the most specific at the bottom. A programming philosophy that promotes protecting data and hiding implementation in order to preserve the integrity of data and methods. (*)

Correct

34. Any instance of the same class can assign a new value to a static variable. True or false?

True (*) False

Correct

35. Static methods can change instance variables at run-time. True or false?

True False (*)

_{Next Summary}

Section 7

36. A base case can handle nested conditions. True or false?

True (*) False

Correct

(62)

It would print the array one element at a time. The console screen would display: 0 18 215 64 11 42

It would print the string returned from the method. The console screen would display: [0,18,215,64,11,42,] (*) It would print the array backwards. The console screen would display: 42 11 64 215 18 0

It would print the string returned from the method. The console screen would display: {0, 18, 215, 64, 11, 42} Correct

38. Identify the correct way to declare an abstract class.

abstract public class ClassName{...} public abstract ClassName(...) public class abstract ClassName(...) public abstract class ClassName{...} (*)

Incorrect. Refer to Section 7 Lesson 5. 39. If a class is immutable then it must be abstract. True or false?

True False (*)

40. A class can only have one constructor. True or false?

True False (*)

Next Summary

Section 7

(63)

31 32 10 11 (*)

42. What is the output of the following code segment: int n = 13;

System.out.print(doNothing(n)); System.out.print(" ", n);

where the code from the method doNothing is: public double doNothing(int n)

{ n = n + 8; return (double) 12/n; } 1.75, 13 0.571, 21 1.75, 21 0.571, 13 (*)

Incorrect. Refer to Section 7 Lesson 1. 43. What is true about the code below:

Car car1=new Car(); Car car2=new Car(); car2=car1;

The references car1 and car2 are pointing to two Car Objects in memory.

The reference car2 points to an exact copy of the Car Object that car1 references. (*) There are no more Car objects in memory.

(64)

There is a Car object that car1 referenced that is now slated for removal by the garbage collector. There is a Car object that car2 referenced that is now slated for removal by the garbage collector. (*)

Incorrect. Refer to Section 7 Lesson 1. 44. Which of the following calls the method calculate correctly?

ThisClass t=new ThisClass(); int x=t.calculate(3,4); (*) int x=calculate(3,4);

ThisClass t=new ThisClass(); int x=t.calculate(3); ThisClass t=new ThisClass(); int x=t.calculate();

Correct 45. What is wrong with the following class declaration?

class Account{ ; private int number; private String name;; public Account; }

Classes cannot include strings.

Classes cannot include mixed data types. The constructor method has no definition. (*) There is nothing wrong.

Correct

_Next

_Summary

Section 7

(65)

46. Which of the following specifies accessibility to variables, methods, and classes? Methods Parameters Overload constructors Access modifiers (*) Correct

47. Which of the following correctly defines overloading?

Having more than one constructor with the same name but different arguments. (*) Having more than one constructor with different names and the same arguments. A variable argument method that returns an array.

A type of access specifier that only allows access from inside the same class. Incorrect. Refer to Section 7 Lesson 2.

48. Which of the following is the correct definition of a parameter?

A keyword that specifies accessibility of code.

A way to call a method with a variable number of arguments using an elipse. A variable in a method declaration that gets passed into the method. (*) A type of access specifier.

It is used to assign initial values to instance variables of a class; the structure is very similar to that of a method. Correct

49. Which segment of code represents a correct way to call a variable argument method counter that takes in integers as its variable argument parameter?

counter(String a, int b); counter(int[] numbers);

counter(1, 5, 8, 17, 11000005); (*) counter("one","two",String[] nums);

(66)

50. Which of the following is the definition of a constructor?

A keyword that specifies accessibility of code.

A special method that is used to assign initial values to instance variables in a class. (*) A way to call a method with a variable number of arguments using an elipse.

A variable in a method declaration that gets passed into the method. Incorrect. Refer to Section 7 Lesson 2.

_Summary

Which of

the

following

defines a

driver

class?

Mark for Review

(1) Points

Contains a main method and other static methods. (*)

Contains classes that define objects.

Contains a main method, a package, static methods, and classes

that define objects.

None of the above.

Correct

2. The following defines a package keyword:

Mark for

Review

(1) Points

Defines where this class lives relative to other classes, and

provides a level of access control. (*)

Provides the compiler information that identifies outside classes

used within the current class.

Precedes the name of the class.

Correct

3. What is printed by the following code segment?

Mark for

Review

(1) Points

(67)

alligator (*)

albatross alligator

albatross

a1

Correct

4. Which of the following instantiates a String named name to Oracle?

Mark for

Review

(1) Points

String name;

String Oracle="name";

String name="name";

String name="Oracle"; (*)

Correct

5. Consider the following code snippet.

What is printed?

Mark for

Review

(1) Points

0 1 (*)

2

11

12 Correct

6 .

What will the

following code

segment output?

String

Mark for Review

(1) Points

(68)

s="\\\n\"\n\\\n\"";

System.out.println(s

);

\" \"

""\

""

\

""

\

"

\

" (*)

"

\

"

\

"

Correct

7. The following program prints "Not Equal". True or false?

Mark

for

Review

(1) Points

True

False (*)

Correct

8. For every opening curly brace { there does not need to be a

closing curly brace} for the program to compile without

error. True or False?

Mark

for

Review

(1) Points

True

False (*)

Correct

(69)

9. The ______________ is the location into which you will

store and save your files.

Mark

for

Review

(1) Points

Perspective

Workspace (*)

Editor

None of the above

Correct

10. When converting gallons to liters its best to put the

calculation result into a variable with a _______________

data type.

Mark

for

Review

(1) Points

int

double (*)

boolean

None of the above

Correct

11.What

symbols

are

required

for a

compiler

to ignore

a

comment

?

Mark for Review

(1) Points

// (*)

/*

*/

/*/

Incorrect. Refer to Section 4

Lesson 1.

12. Eclipse does not provide views to help you

(70)

False?

(1) Points

True

False (*)

Correct

13. A local variable has precedence over a global

variable in a Java method. True or false?

Mark for Review

(1) Points

True (*)

False

Correct

14. Which of the following is not a legal name for a

variable?

Mark for Review

(1) Points

2bad (*)

zero

theLastValueButONe

year2000

Correct

Section 5 (Answer all questions in this section)

15. Why are loops useful?

Mark for Review

(1) Points

They save programmers from having to

rewrite code.

They allow for repeating code a variable

number of times.

They allow for repeating code until a certain

argument is met.

All of the above. (*)

Correct

16 .

What

should

replace

(71)

the

comment

"//your

answer

here" in

the code

below if

the code

is meant

to take no

action

when i %

2 is 0 (in

other

words

when i is

even)?

for(int i =

0; i < 10;

i++)

{<br> if(i

%2 == 0)

//your

answer

here

else

k+=3;

}

(1) Points

continue; (*)

break;

return;

k+=1;

Correct

17. What is the output of the following code

segment?

int num = 7;

while(num >= 0)

{

num -= 3;

}

System.out.println(num);

Mark for Review

(1) Points

-2 (*)

1

(72)

0

2 Correct

18. Consider that a Scanner has been initialized such

that:

Scanner in = new Scanner(System.in);

Which of the following lines of code reads in the

user's input and sets it equal to a new String

called input?

Mark for Review

(1) Points

String input = in.next(); (*)

String input = in.close();

String input = new String in.next();

String input = in.nextInt();

Correct

19. This keyword is used to instruct specific code

when the input for a switch statement that does

not match any of the cases.

Mark for Review

(1) Points

Switch

Case

Break

Default (*)

None of the above

Correct

20. The three logic operators in Java are:

Mark for Review

(1) Points

&&, ||, ! (*)

!=,=,==

&&,!=,=

&,|,=

Correct

2

6. Which

of the

(73)