Computer Science

Question 1 (1 point)

Question 1 Unsaved

Select the line of Java code that will correctly declare a float variable named average and assign the variable a value of 3.4.

Question 1 options:

None of the above
int average; average = 3.4;
int average = 3.4D;
int average = 3.4f;
int average = 3.4;

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Question 2 (1 point)

Question 2 Unsaved

Select the correct line of Java code to assign 1000 to an int variable named myValue.

Question 2 options:

int myValue = 1000;
int myValue = 0x3E8;
int myValue = 0b1111101000;
All of the above
None of the above

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Question 3 (1 point)

Question 3 Unsaved

Which of the following is an invalid Java statement:

Question 3 options:

System.out.println(“Hello, World! “);
int d = 14;
d++;
x + y/100;
None of the above

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Question 4 (1 point)

Question 4 Unsaved

Which of the following statements is a comment in Java

Question 4 options:

/ This is a test
public class Hello {
// This is a test. //
(String[] args)
None of the above

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Question 5 (1 point)

Question 5 Unsaved

Will the following Java code compile and run?

public class QuizItem  {    public static void main(String[] args)       {           final int age = 38;      System.out.println(“Age is ” + Age);    } }

Question 5 options:

Yes
No

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Question 6 (1 point)

Question 6 Unsaved

What is the output from the following Java code?

public class Week1Quiz {

public static void main (String[] args) {

System.out.println (“Welcome”);

System.out.println (“to”);

System.out.print (“UMUC!”);

}

}

Question 6 options:

Welcome to UMUC!
No output as the code will not compile.
Welcome to UMUC
None of the above
WelcometoUMUC

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Question 7 (1 point)

Question 7 Unsaved

What character is assigned to the variable myChar in the following line of Java code?

char value = ‘\u0023’;

Question 7 options:

#
y
null
?
X

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Question 8 (1 point)

Question 8 Unsaved

Will the following Java code compile and run without errors? public class QuizItem  {    public static void main(String[] args)       {           final int age = 38;      age = 39;       System.out.println(“Age is ” + age);    } }

Question 8 options:

Yes
No

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Question 9 (1 point)

Question 9 Unsaved

You are designing a program for users to enter whole numbers that range from -200 to 2147483648. What Java data type will best satisfy this range of numbers?

Question 9 options:

int
long
byte
char
short

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Question 10 (1 point)

Question 10 Unsaved

Given the following sequence of Java code: int var = 4; var++; var = var + 2; var–; var = -var;   What is the final value of var?

Question 10 options:

4
-6
8
-9
None of the above

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Question 11 (1 point)

Question 11 Unsaved

You are designing a program for users to enter whole numbers that range from -100 to 127. What Java data type will best and most efficiently satisfy this range of numbers?

Question 11 options:

int
char
byte
long
short

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Question 12 (1 point)

Question 12 Unsaved

Given the following sequence of Java code: int var1 = 9; int var2 = 12; boolean failure = false; int result = failure ? var1 : var2; What is the value of result after executing the code?

 

Question 12 options:

12
9:12
9
3
0.75

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Question 13 (1 point)

Question 13 Unsaved

Select the Java code that will correctly declare a boolean variable named success and assign it a value of false.

Question 13 options:

Boolean success = true;
int success = false;
None of the above
boolean success = 1;
boolean success = 0;

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Question 14 (1 point)

Question 14 Unsaved

Given the following sequence of Java code: int var1 = 9; int var2 = 12; int var3 = 12;   Which of the following statements evaluate to true

Question 14 options:

var1 != var2
var1 < var2
var1 <= var2
var2 == var3
All of the above

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Question 15 (1 point)

Question 15 Unsaved

What is the output from the following Java code?

public class Week1Quiz {

public static void main (String[] args) {

System.out.print (“Welcome”);

System.out.print (“to “);

System.out.println (“UMUC”);

System.out.print (“!”);

}

}

Question 15 options:

WelcometoUMUC
Welcome to UMUC
Welcome to UMUC !
No output as the code will not compile.
None of the above

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Question 16 (1 point)

Question 16 Unsaved

What Java keyword can used to create a named constant?

Question 16 options:

static
default
final
enum
public

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Question 17 (1 point)

Question 17 Unsaved

If we declared the following variables in Java

int age = 27;           int cafe = 0xCAFE;      int number1 =0b0001;   What is the output for the following Java statement?

System.out.println(age + cafe + number1);

Question 17 options:

2720001
51994
54,false,A5194327
None of the above

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Question 18 (1 point)

Question 18 Unsaved

A non-local boolean variable is declared with the following Java code:

boolean myVar;

What is the value of myVar?

Question 18 options:

true
false
null
Unknown
None of the above

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Question 19 (1 point)

Question 19 Unsaved

Given the following sequence of Java code: int var1 = 4; int var2 = 6; int var3 = 10; int results = (var1 + var2) * var3 /(var1 + var3) – var2%var1; What is the values of results after executing the code?

Question 19 options:

6
5
-2
9
None of the above

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Question 20 (1 point)

Question 20 Unsaved

Given the following sequence of Java code: int var1 = 9; int var2 = 12; int var3 = 12; Which of the following statements evaluate to true

Question 20 options:

(var1 == var2) || (var1 < var2)
(var1 == var2) && (var1 < var2)
!(var2 == var3)
(var2 <= var3) && (var2 < var1)
None of the above

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Question 21 (1 point)

Question 21 Unsaved

What is the filename extension used for all Java source files.

Question 21 options:

.js
.java
.javac
.cs
None of the above

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Question 22 (1 point)

Question 22 Unsaved

From the list of Java variable names below, select the illegal variable name.

Question 22 options:

K149a$
2ForMe
XXXXXXXXXXXXXXYYYYYYYYYYYYYYYzzzzzzzzzzzzzzzz
Johns1290sX4k
NoneForYou

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Question 23 (1 point)

Question 23 Unsaved

What must be installed on a computer to be able to run bytecodes?

Question 23 options:

Java Virtual Machine (VM)
Microsoft Visual Basic
Ubuntu Server
Oracle Database (11g or higher)
None of the above

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Question 24 (1 point)

Question 24 Unsaved

What is the filename extension used for all Java compiled files.

 

Question 24 options:

.cs
.javac
.bytes
.class
None of the above

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Question 25 (1 point)

Question 25 Unsaved

What development tool do you use to launch Java bytecodes?

Question 25 options:

java
javadoc
javac
jconsole
All of the above

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