Test JAVA Fundamentals Final Exam

Test: Java Fundamentals Final Exam

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

Top of FormSection 4

(Answer all questions in this section)

1.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

True

False (*)

Correct

2.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

3.The following code prints 5 "a"'s to the screen:

Mark for Review(1) Points

True

False (*)

Correct

4.Consider the following code snippet.

What is printed?Mark for Review(1) Points

55555

87658

AtlanticPacificIndianArcticSouthern

Code does not compile

ArrayIndexOutofBoundsException is thrown (*)

Incorrect. Refer to Section 4 Lesson 4.

5.The following program prints "Not Equal":

True or false?Mark for Review(1) Points

True (*)

False

Correct

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6.The String methods equals and compareTo perform similar functions and differ in their return type. True or false?Mark for Review(1) Points

True (*)

False

Correct

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

True (*)

False

Correct

8.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 (*)


9.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.

Correct

10.In a project, 1 of the classes must contain a main method. True or False?Mark for Review(1) Points

True (*)

False

Correct

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11.In Eclipse, when you run a Java Application, the results are displayed in a new window. True or False?Mark for Review(1) Points

True

False (*)

Correct

12.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

13.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);Mark for Review(1) Points

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

Correct

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

Section 5


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


True

False (*)

Correct


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16.Which of the following could be a reason to use a switch statement in a Java program?Mark for Review(1) Points

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.


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

if (gender == "female") System.out.print("Ms.");elseSystem.out.print("Mr.");Mark for Review(1) Points

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

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

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

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

Correct

18.All of the following are essential to initializing a for loop, except which one?Mark for Review(1) Points

Initializing the iterator(i).

Having a conditional statement.

Updating the counter.

Having an if statement. (*)

Correct

19.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

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 (*)

Correct


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21.What will array arr contain after the following code segment has been executed?

int [] arr = {5, 4, 2, 1, 0};for (int i = 1; i < arr.length; i++)
{arr[i - 1] += arr[i];}Mark for Review(1) Points

9, 6, 1, 3, 0

10, 6, 3, 1, 0

9, 6, 3, 1, 0 (*)

7, 3, 2, 1, 0

None of the above.

Correct

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


456789

777777 (*)

555555

987654

This code doesn't compile.

Correct

23.What will be the content of the array variable table after executing the following code?


1 1 10 1 10 0 1

1 0 00 1 00 0 1

1 0 01 1 01 1 1 (*)

0 0 10 1 01 0 0


24.The following array declaration is valid. True or false?

int[] y = new int[5];Mark for Review(1) Points

True (*)

False

Correct

25.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 (*)

Correct


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26.Bubble Sort is a sorting algorithm that involves swapping the smallest value into the first index, finding the next smallest value and swapping it into the next index and so on until the array is sorted. True or false?Mark for Review(1) Points

True

False (*)


27.Which of the following sorting algorithms utilizes a "divide and conquer" technique to sort arrays with optimal speed?Mark for Review(1) Points

Sequential Search

Merge Sort (*)

Selection Sort

Binary Search

All of the above


28.A sequntial search is an iteration through the array that stops at the index where the desired element is found. True or false?Mark for Review(1) Points

True (*)

False

Correct

29.Of the options below, what is the fastest run-time?Mark for Review(1) Points

n

n^2

lg(n) (*)

n*lg(n)


Section 7


30.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


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31.What does it mean to override a method?Mark for Review(1) Points

It is a way to create multiple methods with the same name but different parameters.

It allows an array to contain different object types.

It restricts the privacy of the method to only be accessible from inside the same class.

It is a way of redefining methods of a parent class inside the child class, with the same name, parameters, and return type. (*)

Correct

32.What is the Java keyword final used for in a program?Mark for Review(1) Points

It restricts a class from being extendable and restricts methods from being overridden. (*)

It permits access to the class variables and methods from anywhere.

It permits redefining methods of a parent class inside the child class, with the same name, parameters, and return type.

It terminates the program.

There is no such keyword in Java.

Correct

33.Which of the following correctly describes the use of the keyword super?Mark for Review(1) Points

A keyword that restricts access to only inside the same class.

A keyword that allows subclasses to access methods, data, and constructors from their parent class. (*)

A keyword that signals the end of a program.

A keyword that allows access from anywhere.

Correct

34.Which of the following demonstrates the correct way to create an applet Battlefield?Mark for Review(1) Points

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

public Applet Battlefield{...}

public class Applet extends Battlefield{...}

public class Battlefield(Applet){...}

Correct

35.It is possible for a subclass to be a superclass. True or false?Mark for Review(1) Points

True (*)

False

Correct


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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.

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

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

True (*)

False

Correct

38.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;}Mark for Review(1) Points

1.75, 13

0.571, 21

1.75, 21

0.571, 13 (*)


39.What operator do you use to call an object's constructor method and create a new object?Mark for Review(1) Points

+

new (*)

instanceOf

Correct

40.Identify the driver class that correctly initializes employees Jane and Brandon. The Employee class is below.

public class Employee {private String name;private int age;private double salary;public Employee(String n, int a, double s) {name = n;age = a;salary = s;}//methods for this class would go here}Mark for Review(1) Points

public class driver_class {public static void main(String[] args) {Employee Jane = new Employee("Jane", 48, 35.00);Employee Brandon = new Employee("Brandon", 36, 20.00);}} (*)

public class driver_class {public static void main(String[] args) {Employee("Jane", 48, 35.00);Employee("Brandon", 36, 20.00);}}

public class driver_class {public Employee{Jane = new Employee("Jane", 48, 35.00);Brandon = new Employee("Brandon", 36, 20.00);}}

public class Employee {public class driver-class{Employee Jane = new Employee();Employee Brandon = new Employee();}}

Correct


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41.What is true about the code below:

Car car1=new Car();Car car2=new Car();car2=car1;Mark for Review(1) Points

(Choose all correct answers)

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.

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. (*)


42.Which of the following creates a class named Student with one constructor, and 2 instance variables, name and gpa?Mark for Review(1) Points

public class Student { private String name; private float gpa; }

public class Student private String name; private float gpa; Student();

public class Student { private String name; private float gpa; Student(){ name="Jane Doe"; gpa=3.0;} } (*)

public class Student { private String name; Student{ name="Jane Doe"; float gpa=3.0; }

Correct

43.Which of the following is the definition of a constructor?Mark for Review(1) Points

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.

Correct

44.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.

Correct

45.It is possible to return an object from a method. True or false?Mark for Review(1) Points

True (*)

False

Correct


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46.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

47.How is it possible for overloading to work?Mark for Review(1) Points

There is no such thing as overloading.

The code has to be declared as private.

The interpreter doesn't care what you name your constructors.

Java Virtual Machine searches until it finds a constructor name and argument type match. (*)

Correct

48.Forward thinking helps when creating linear recursive methods. True or false?Mark for Review(1) Points

True

False (*)

Correct

49.Static classes can have different access specifiers than the parent class. True or false?Mark for Review(1) Points

True (*)

False

Correct

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

True

False (*)

Correct

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Test Summary: Java Fundamentals Final Exam

Click a question to return to it. You will see the response that was entered and whether or not the response was correct. If the response was incorrect the correct answer will be displayed.

Top of FormAnsweredUnansweredReviewStatusQuestionMandatory?Points AvailablePoints Awarded

Section 41412

When importing another packa...Yes11

Which of the following defin...Yes11

The following code prints 5 "...Yes11

Consider the following code s...Yes10

The following program prints ...Yes11

The String methods equals an...Yes11

The == operator tests if two...Yes11

Multiple windows are used whe...Yes10

When you open more than one ...Yes11

In a project, 1 of the classe...Yes11

In Eclipse, when you run a J...Yes11

A combination of views and e...Yes11

What is the result when the ...Yes11

Which line of Java code will...Yes11

Section 565

The following prints Yes on t...Yes11

Which of the following could...Yes10

How would you use the ternar...Yes11

All of the following are ess...Yes11

What is the output of the fo...Yes11

A counter used in a for loop...Yes11

Section 695

What will array arr contain ...Yes11

What is the output of the fol...Yes11

What will be the content of t...Yes10

The following array declarat...Yes11

A logic error occurs if an u...Yes11

Bubble Sort is a sorting alg...Yes10

Which of the following sorti...Yes10

A sequntial search is an ite...Yes11

Of the options below, what i...Yes10

Section 72119

If Oak extends Tree, it is p...Yes11

What does it mean to overrid...Yes11

What is the Java keyword fin...Yes11

Which of the following corre...Yes11

Which of the following demon...Yes11

It is possible for a subclass...Yes11

Which of the following corre...Yes11

A constructor must have the ...Yes11

What is the output of the fol...Yes10

What operator do you use to ...Yes11

Identify the driver class tha...Yes11

What is true about the code ...Yes10

Which of the following creat...Yes11

Which of the following is th...Yes11

Which of the following could...Yes11

It is possible to return an ...Yes11

Which segment of code repres...Yes11

How is it possible for overl...Yes11

Forward thinking helps when ...Yes11

Static classes can have diff...Yes11

A static variable is always ...Yes11

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