Final Exam Java Fundamental

Final Exam

Section 4

            (Answer all questions in this section)

1.         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

2.         Multiple windows are used when more than one file is open in the edit area. True or False?           Mark for Review

(1) Points

            True

            False (*)

3.         A workspace can have one or more stored projects. True or false?    Mark for Review

(1) Points

            True (*)

            False

4.         Tabs are used when more than one file is open in the edit area. True or False?         Mark for Review

(1) Points

            True (*)

            False

5.         A _______________ is used to organize Java related files.   Mark for Review

(1) Points

            Collection

            Project

            Package (*)

            Workspace

Section 4

            (Answer all questions in this section)

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

Mark for Review

(1) Points

            

            Example A

            Example B (*)

7.         The following defines a package keyword:    Mark for Review

(1) Points

            Provides the compiler information that identifies outside classes used within the current class.

            Precedes the name of the class.

            Defines where this class lives relative to other classes, and provides a level of access control. (*)

8.         The following code is an example of a correct initialization statement:

char c="c";       Mark for Review

(1) Points

            True

            False (*)

9.         Suppose that str1 and str2 are two strings. Which of the statements or expressions are valid?         Mark for Review

(1) Points

            Str1 -= str2;

            str1 >= str2

            str1 += str2; (*)

            String str3 = str1 - str2;

10.       Which of the following creates a String named string?          Mark for Review

(1) Points

            String String;

            String s;

            String char;

            char string;

            String string; (*)

Section 4

            (Answer all questions in this section)

11.       Which of the following creates a String reference named s and instantiates it?        Mark for Review

(1) Points

                                    (Choose all correct answers)  

            s="s";

            String s;

            String s=new String("s"); (*)

            String s=""; (*)

12.       Which of the following creates a String reference named str and instantiates it?      Mark for Review

(1) Points

            str="str";

            String str=new String("str"); (*)

            String str;

            String s="str";

13.       Which line of code does not assign 3.5 to the variable x?      Mark for Review

(1) Points

            x=7.0/2.0;

            x=3.5;

            double x=3.5

            3.5=x; (*)

14.       Which line of Java code assigns the value of 5 raised to the power of 8 to a?          Mark for Review

(1) Points

            int a=Math.pow(8,5);

            double a=15^8;

            double a=Math.pow(5,8); (*)

            int a=Math.pow(5,8);

            double a=pow(8,5);

15.       What two values can a boolean variable have?           Mark for Review

(1) Points

            Integers and floating point types

            Arithmetic and logic operators

            True and false (*)

            Relational and logic operators

            Numbers and characters

Section 5

            (Answer all questions in this section)

16.       The following prints Yes on the screen. True or false?

 Mark for Review

(1) Points

            True

            False (*)

17.       How would you use the ternary operator to rewrite this if statement?

if (gender == "female") System.out.print("Ms.");

else

System.out.print("Mr.");         Mark for Review

(1) Points

            System.out.print( (gender == "female") ? "Mr." : "Ms." );

            (gender == "female") ? "Ms." : "Mr." ;

            System.out.print( (gender == "female") ? "Ms." : "Mr." ); (*)

            (gender == "female") ? "Mr." : "Ms." ;

18.       Which of the following expressions will evaluate to true when x and y are boolean variables with opposite values?

I. (x || y) && !(x && y)

II. (x && !y) || (!x && y)

III. (x || y) && (!x ||!y)            Mark for Review

(1) Points

            I only

            II only

            I and III

            II and III

            I, II, and III (*)

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. (*)

20.       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 (*)

Section 5

            (Answer all questions in this section)

21.       Which of the following best describes a while loop? Mark for Review

(1) Points

            A loop that contains a counter in parenthesis with the conditional statement.

            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 segment of code that is executed before the conditional statement is tested.

            Section 6

            (Answer all questions in this section)

22.       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 (*)

23.       What does it mean to catch an exception?     Mark for Review

(1) Points

            It means you have fixed the error.

            It means there was never an exception in your code.

            It means to handle it. (*)

            It means to throw it.

24.       What do exceptions indicate in Java? Mark for Review

(1) Points

                                    (Choose all correct answers)  

            The code has considered and dealt with all possible cases.

            The code was not written to handle all possible conditions. (*)

            A mistake was made in your code. (*)

            Exceptions do not indicate anything, their only function is to be thrown.

            There are no errors in your code.

25.       Which of the following would be a correct way to handle an index out of bounds exception?        Mark for Review

(1) Points

                                    (Choose all correct answers)  

            Rewrite your code to avoid the exception by not permititng the use of an index that is not inside the array. (*)

            Throw the exception that prints out an error message. There is no need to have the catch handle the exception if it has already been thrown.

            Throw the exception and catch it. In the catch, set the index to the index of the array closest to the one that was out of bounds. (*)

            Do nothing, it will fix itself.

Section 6

            (Answer all questions in this section)

26.       The following creates a reference in memory named k that can refer to six different integers via an index. True or false?

int k[]= int[6]; Mark for Review

(1) Points

            True

            False (*)

27.       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)" o:p="">

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

(1) Points

            97531

            987654321

            9630

            963 (*)

            This code doesn't compile.

28.       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="" o:p="">

for(int j=0;j<3 j="" o:p="">

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

(1) Points

            246642

            444444 (*)

            222222

            This code doesn't compile.

            123321

29.       What is the output of the following segment of code?

Mark for Review

(1) Points

            1286864

            643432

            666666 (*)

            262423242322

            This code does not compile.

Section 7

            (Answer all questions in this section)

30.       Which of the following could be a reason to return an object?          Mark for Review

(1) Points

            Because you wish to be able to use that object inside of the method.

            It has faster performance than returning a primitive type.

            The method makes changes to the object and you wish to continue to use the updated object outside of the method. (*)

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

Section 7

            (Answer all questions in this section)

31.       Which of the following is the definition for a variable argument method?   Mark for Review

(1) Points

            A way to create a new class.

            A type of argument that enables calling the same method with a different number of arguments. (*)

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

            Specifies accessibility to code.

32.       You are assigned to write a method that compares two objects of type Career. One requirement of your assignment is to have your method compare the "greatestPossibleSalary" instance data of Career objects. The "greatestPossibleSalary" field is data type int.

What would be the best return type from your compare method?     Mark for Review

(1) Points

            Array, because it can store the most information.

            Integer, because it is the easiest to code with.

            Career, because if it returns the highest paying Career object it will be able to use the same method later to compare other aspects of Career objects. (*)

            String, because is should return a string of the name of the career that is highest paying because none of the other information of the career matters.

33.       What type(s) would work for a variable argument method?  Mark for Review

(1) Points

                                    (Choose all correct answers)  

            Integers, Strings, and Booleans (*)

            Constructors

            Arrays (*)

            Objects (*)

            All of the above

34.       Following good programming guidelines, what access modifier should be used for the class fields in the following situation?

A car insurance company wants to create a class named Customer that stores all data for a specified customer including the fields: vehicle information, policy information, and a credit card number.      Mark for Review

(1) Points

            public

            protected

            private (*)

            default

            All of the above

35.       Methods are generally declared as public so other classes may use them. True or false?       Mark for Review

(1) Points

            True (*)

            False

Section 7

            (Answer all questions in this section)

36.       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. (*)

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

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

            It restricts access to a specified segment of code.

37.       Which of the following demonstrates the correct way to create an applet Battlefield?        Mark for Review

(1) Points

            public class Applet extends Battlefield{...}

            public class Battlefield(Applet){...}

            public class Battlefield extends Applet{...} (*)

            public Applet Battlefield{...}

38.       What is encapsulation?           Mark for Review

(1) Points

            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 keyword that allows or restricts access to data and methods.

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

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

39.       The following code creates an object of type Horse:

Whale a=new Whale();           Mark for Review

(1) Points

            True

            False (*)

40.       Which of the following keywords are used to access the instance variables of an object from within the class code for that object?      Mark for Review

(1) Points

            private

            protected

            public

            this (*)

Section 7

            (Answer all questions in this section)

41.       Which constructor code populates the instance variables of the class correctly?       Mark for Review

(1) Points

(*)

42.       Which of the following calls the method calculate correctly?

  Mark for Review

(1) Points

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

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

            int x=calculate(3,4);

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

43.       Which of the following creates a method that returns a boolean value?        Mark for Review

(1) Points

(*)

            None of the above.

44.       A constructor must have the same name as the class where it is declared. True or false?      Mark for Review

(1) Points

            True (*)

            False

45.       Which of the following is a goal of the object model?           Mark for Review

(1) Points

                                    (Choose all correct answers)  

            Concealing implementation. (*)

            Providing modular code that can be reused by other programs or classes. (*)

            Protecting information and limiting other classes' ability to change or corrupt data. (*)

            Data abstraction. (*)

Section 7

            (Answer all questions in this section)

46.       Which of the following can be declared final?           Mark for Review

(1) Points

            Classes

            Methods

            Local variables

            Method parameters

            All of the above (*)

47.       If we override the toString() method with the code below, what would be the result of printing?

  Mark for Review

(1) Points

            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}

            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,] (*)

48.       You can use an inner static class to return an instance of its outer class container. True or false?     Mark for Review

(1) Points

            True (*)

            False

49.       You can return an instance of a private class through a static method of a different class. True or false?            Mark for Review

(1) Points

            True

            False (*)

50.       You can assign new values to static variables by prefacing them with the this keyword and a dot or period. True or false?  Mark for Review

(1) Points

            True (*)

            False