Kunci Jawaban Java Fundamentals Final Test Exam.docx

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

Top of Form

Section 4

(Answer all questions in this section)

1.
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 (*)

Correct

2.
The following program prints "Not Equal":

True or false?
Mark for Review
(1) Points

True (*)

False

Correct

3.
Consider the following code snippet.

What is printed?
Mark for Review
(1) Points

Cayrbniz

CayrbnizCayrbniz

yr (*)

ay

ArrayIndexOutofBoundsException is thrown

Correct

4.
What will the following code segment output?

String s="\\\n\"\n\\\n\"";
System.out.println(s);
Mark for Review
(1) Points

\" \"

""\
""
\
""

\
"
\
" (*)

"
\
"
\
"
"

Correct

5.
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

s1 = s2

s3 == s1 (*)

s1.equals(s2)

s3.equals(s1)

Correct

Bottom of Form
Section 4


6.
The following defines an import 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

7.
Which of the following defines an object 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

8.
Which of the following is not a legal name for a variable?
Mark for Review
(1) Points

2bad (*)

zero

theLastValueButONe

year2000

Correct

9.
Which of the following is the name of a Java primitive data type?
Mark for Review
(1) Points

Object

Rectangle

double (*)

String

Correct

10.
A workspace can not have more than one stored projects. True or false?
Mark for Review
(1) Points

True

False (*)

Correct

Section 4


11.
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 (*)

Incorrect. Refer to Section 4 Lesson 1.

12.
What symbols are required for a compiler to ignore a comment?
Mark for Review
(1) Points

// (*)

/*

*/

/*/

Correct

13.
You need to _______________ Java code to generate a .class file
Mark for Review
(1) Points

Collect

Compile (*)

Package

Assemble

Correct

14.
What is the purpose of the Eclipse Editor Area and Views?
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

Section 5


15.
switch statements work on all input types including, but not limited to, int, char, and String. True or false?
Mark for Review
(1) Points

True

False (*)

Correct

Section 5


16.
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." );

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

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

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


17.
Determine whether this boolean expression evaluates to true or false:

!(3<4&&6>6""6<=6&&7-2==6)
Mark for Review
(1) Points

True (*)

False


18.
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 (*)


19.
When the for loop condition statement is met the construct is exited. True or false?
Mark for Review
(1) Points

True

False (*)

Correct

20.
Which of the following is true about a do-while loop?
Mark for Review
(1) Points

It is a post-test loop.

It is a modified while loop that allows the program to run through the loop once before testing the boolean condition.

It continues looping until the condition becomes false.

All of the above. (*)

Correct

Section 6


21.
Which of the following statements add all of the elements of the one dimensional array prices, and then prints the sum to the screen?
Mark for Review
(1) Points

int total = 0;
for(int i = 0; i
total+=prices[i];

int total = 0;
for(int i = 0; i
total+=prices[i];
System.out.println(total); (*)

int total = 0;
for(int i = 1; i
total = total+prices[i];
System.out.println(prices);

int total = 0;
for(int i = 0; i
total+=prices[i];
System.out.println(prices);

Correct

22.
What is the output of the following segment of code if the command line arguments are "a b c d e f g"?

Mark for Review
(1) Points

f

e (*)

c

d

This code doesn't compile.


23.
What is the output of the following segment of code?

Mark for Review
(1) Points

321123

642

642246 (*)

312213

This code doesn't compile.

Correct

24.
The following segment of code initializes a 2 dimensional array of primitive data types. True or false?

double[][] a=new double[4][5];
Mark for Review
(1) Points

True (*)

False

Correct

25.
What is wrong with this code?

Mark for Review
(1) Points

It is missing a semicolon.

It does not compile. (*)

It gives you an out of bounds exception.

There is nothing wrong with this code.

Correct

Section 6


26.
Selection sort is a sorting algorithm that involves finding the minimum value in the list, swapping it with the value in the first position, and repeating these steps for the remainder of the list. True or false?
Mark for Review
(1) Points

True (*)

False

Correct

27.
Of the options below, what is the fastest run-time?
Mark for Review
(1) Points

n

n^2

lg(n) (*)

n*lg(n)

Correct

28.
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 (*)

Correct

29.
Why might a sequential search be inefficient?
Mark for Review
(1) Points

It utilizes the "divide and conquer" method, which makes the algorithm more error prone.

It requires incrementing through the entire array in the worst case, which is inefficient on large data sets. (*)

It involves looping through the array multiple times before finding the value, which is inefficient on large data sets.

It is never inefficient.

Correct

Section 7


30.
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";
return carA;}

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

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

Correct

Section 7


31.
Which of the following specifies accessibility to variables, methods, and classes?
Mark for Review
(1) Points

Methods

Parameters

Overload constructors

Access modifiers (*)


32.
Which of the following are access modifiers?
Mark for Review
(1) Points

(Choose all correct answers)

protected (*)

public (*)

secured

default (no access modifier) (*)

private (*)


33.
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

34.
Which segment of code correctly defines a method that contains two objects of class Tree as parameters?
Mark for Review
(1) Points

void bloom(Tree pine, Tree oak) {//code here }; (*)

Tree bloom (pine, oak) {//code here };

void bloom, Tree pine, Tree oak {//code here };

None of the above, objects cannot be passed as parameters.


35.
What is Polymorphism?
Mark for Review
(1) Points

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. (*)

Correct

Section 7


36.
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

37.
Abstract classes cannot implement interfaces. True or false?
Mark for Review
(1) Points

True

False (*)

Correct

38.
A linear recursion requires the method to call which direction?
Mark for Review
(1) Points

Forward

Backward (*)

Both forward and backward

None of the above

Correct

39.
There is only one copy a static class variable in the JVM. True or false?
Mark for Review
(1) Points

True (*)

False

Correct

40.
Static methods can't change any class variable values at run-time. True or false?
Mark for Review
(1) Points

True

False (*)

Correct

Section 7


41.
In Java, an instance field referenced using the this keyword generates a compilation error. True or false?
Mark for Review
(1) Points

True

False (*)

Correct

42.
A constructor is used to create objects. True or false?
Mark for Review
(1) Points

True (*)

False

Correct

43.
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

44.
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 static void main(String[] args) {
Employee("Jane", 48, 35.00);
Employee("Brandon", 36, 20.00);
}
}

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();
}
}


45.
Which of the following creates a method that compiles with no errors in the class?
Mark for Review
(1) Points

(*)

All of the above.

None of the above.


Section 7


46.
The following code creates an object of type Horse:
Whale a=new Whale();
Mark for Review
(1) Points

True

False (*)

Correct

47.
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);

Correct

48.
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.


49.
Which of the following show the correct UML representation of the super class Planet and its subclass Earth?
Mark for Review
(1) Points

(*)

None of the above.


50.
What is encapsulation?
Mark for Review
(1) Points

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 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. (*)


Kunci Jawaban Java Fundamentals Final Test Exam.docx

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