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Java Programming Trivia Quiz

What will the following sections of Java code do?

A multiple-choice quiz by nemesis. Estimated time: 4 mins.

Author
nemesis

Time
4 mins

Type
Multiple Choice

Quiz #
204,270

Updated
Dec 03 21

# Qns
10

Difficulty
Average

Avg Score
7 / 10

Plays
1881

One at a Time - Single Page - Timed Game

Question 1 of 10

1. What would be printed out when the following fragment of code was executed?

String mesg = "Answer is ";
int sum = 1 + 2;
System.out.println(mesg + sum); Hint

333

mesg + sum

Answer is 1 + 2

Answer is 3

NEXT>

Question 2 of 10

2. What would the following fragment of code output?
int sum = 5;
sum = sum + sum *5/2;
System.out.println(sum); Hint

17.5

3. Study the following Java class:
public class outExample

public static void main(String args[]);

int total = 0;
total = 15 + 20/3
System.out.println("totall" + total);

which of the following are correct compilation errors of the above code?

1) total spelt incorrectly in the println statement
2) String args[] should be String[] args
3) a semi-colon is missing from the second line of the main method (total =...)
4) the semi-colon should NOT be after the line ending with args[] Hint

1 and 3

1 and 2

3 and 4

1, 2, and 3

NEXT>

Question 4 of 10

4. Consider the following fragment of Java code:
int limit = 25;
int count = 30;
int total = 200;
count *=5;
limit -=5;
total +=count + limit;
System.out.println("total =" + total); Hint

170

370

NEXT>

Question 5 of 10

5. Consider the following fragment of code
int weekTotal, dayTotal, limit;
weekTotal = 2;
dayTotal = 4;
limit = 2;
if(weekTotal >= 2 || dayTotal >= 4)
weekTotal = dayTotal*limit;
System.out.println("value of weekTotal is " + weekTotal);

What value of weekTotal will be printed out? Hint

NEXT>

Question 6 of 10

6. Consider the following code fragment:

String str1 = "Java";
String str2 = "Java program";
String str3 = "program";

char c = ' ';
String s1 = str1 + str3;
String s2 = str1 + "c";
String s3 = str1 + c;
String s4 = " ";
s4 += str1;
String s5 = s4 + str3;

What would be the value of string s2? Hint

"Java "(last character is a space)

" Java"(first character is a space)

"cJava"

"Javac"

NEXT>

Question 7 of 10

7. Consider the following code fragment

String str1 = "Java";
String str2 = "Java program";
String str3 = "program";

char c = ' ';
String s1 = str1 + str3;
String s2 = str1 + "c";
String s3 = str1 + c;
String s4 = " ";
s4 += str1;
String s5 = s4 + str3;

What would be the value of string s5? Hint

"Java program"

" Java program" (first character is a space)

" Javaprogram" (first character is a space)

"Javaprogram"

NEXT>

Question 8 of 10

8. Which of the following statements about Java methods is false? Hint

a method provides a way of reusing code

variables declared in a method cannot be used outside that method

methods are used to avoid putting comments in code

a method provides a way of breaking a task down into subtasks

NEXT>

Question 9 of 10

9. Which of the following is a constant? Hint

ConsoleWindow c = new consoleWindow();

int value = c.input.readint();

int sum = 0;

final int STOP = -999;

NEXT>

Question 10 of 10

10. Which of the following shows the construction of an object? Hint

int value = c.input.readint();

final int STOP = -999;

ConsoleWindow c = new ConsoleWindow();

int sum = 0;

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Quiz Answer Key and Fun Facts

1. What would be printed out when the following fragment of code was executed? String mesg = "Answer is "; int sum = 1 + 2; System.out.println(mesg + sum);

Answer: Answer is 3

This code will print out whatever the variable "mesg" and the variable "sum" is. In the case mesg is "Answer is" and sum is 1+" = 3 therefore the sum value is "3". The computer will display "Answer is 3"

2. What would the following fragment of code output? int sum = 5; sum = sum + sum *5/2; System.out.println(sum);

Answer: 17

Remember in Java the order, or precedence, of the way sums are worked out:
The fact that:
() are worked out first,
then *, /and % (times, divide, and modulus (the remainder left after a sum)),
then + and - (addition and subtraction),
finally the = (assignment).
Also as the "sum" variable is an int type, nothing after the decimal place when doing the division will be stored.

3. Study the following Java class: public class outExample { public static void main(String args[]); { int total = 0; total = 15 + 20/3 System.out.println("totall" + total); } } which of the following are correct compilation errors of the above code? 1) total spelt incorrectly in the println statement 2) String args[] should be String[] args 3) a semi-colon is missing from the second line of the main method (total =...) 4) the semi-colon should NOT be after the line ending with args[]

Answer: 3 and 4

The "totall" in the println statement isn't a compile error; it will just be a spelling error when the program is run (This rules out 1 as an option.) It doesn't matter where the [] is on the String args[] statement (This rules out 2 as an option.) However the positioning of the ";"'s are very important.

4. Consider the following fragment of Java code: int limit = 25; int count = 30; int total = 200; count *=5; limit -=5; total +=count + limit; System.out.println("total =" + total);

Answer: 370

count would be 30 x 5 = 150
limit would be 25 - 5 = 20
total would be 200 + 150 + 20 = 370

5. Consider the following fragment of code int weekTotal, dayTotal, limit; weekTotal = 2; dayTotal = 4; limit = 2; if(weekTotal >= 2 || dayTotal >= 4) weekTotal = dayTotal*limit; System.out.println("value of weekTotal is " + weekTotal); What value of weekTotal will be printed out?

Answer: 8

As both the weekTotal and the dayTotal variable would activate the loop, (remember || means or) the value of weekTotal would be:
daytotal (4)
times limit (2)
which equals 4 x 2 = 8

6. Consider the following code fragment: String str1 = "Java"; String str2 = "Java program"; String str3 = "program"; char c = ' '; String s1 = str1 + str3; String s2 = str1 + "c"; String s3 = str1 + c; String s4 = " "; s4 += str1; String s5 = s4 + str3; What would be the value of string s2?

Answer: "Javac"

s1 is str1(Java) concatenated with the letter c, resulting in the string "Javac" as no spaces have been added between the two strings.

7. Consider the following code fragment String str1 = "Java"; String str2 = "Java program"; String str3 = "program"; char c = ' '; String s1 = str1 + str3; String s2 = str1 + "c"; String s3 = str1 + c; String s4 = " "; s4 += str1; String s5 = s4 + str3; What would be the value of string s5?

Answer: " Javaprogram" (first character is a space)

the += function adds str1 (Java) onto the end of what's already in the s4 making it " Java", this is the value of s4. s5 is s4 with "program" added on the end, making the string " Javaprogam"

8. Which of the following statements about Java methods is false?

Answer: methods are used to avoid putting comments in code

There is no way to avoid putting comments in code. All code should be commented so other people can understand your work.

9. Which of the following is a constant?

Answer: final int STOP = -999;

A constant is defined by the "final" in the declaration. A constant cannot be changed within the program.

10. Which of the following shows the construction of an object?

Answer: ConsoleWindow c = new ConsoleWindow();

The others are examples of assignment statements.

Hope you enjoyed this quiz :)

Source: Author nemesis

This quiz was reviewed by FunTrivia editor crisw before going online.
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