ExamName___________________________________MULTIPLE CH.docx

Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best
completes the statement or answers the question.
1) Analyze the following program fragment:
int x;
double d = 1.5;
switch (d) {
case 1.0: x = 1;
case 1.5: x = 2;
case 2.0: x = 3;
}
1)
A) The switch control variable cannot be double.
B) The program has a compile error because the required break
statement is missing in the
switch statement.
C) The program has a compile error because the required default
case is missing in the switch
statement.
D) No errors.
2) Analyze the following code:

boolean even = false;
if (even = true) {
System.out.println("It is even!");
}
2)
A) The program runs fine, but displays nothing.
B) The program runs fine and displays It is even!.
C) The program has a runtime error.
D) The program has a compile error.
3) What is the printout of the following switch statement?
char ch = 'a';
switch (ch) {
case 'a':
case 'A':
System.out.print(ch); break;
case 'b':
case 'B':
case 'c':
case 'C':
case 'd':
case 'D':
System.out.print(ch);
}
3)
A) abc B) abcd C) ab D) aa E) a
1

4) The order of the precedence (from high to low) of the
operators +, *, &&, ||, & is: 4)
A) *, +, &, &&, ||
B) *, +, &&, ||, &
C) &&, ||, &, *, +
D) &, ||, &&, *, +
E) *, +, &, ||, &&
5) The statement System.out.printf("%10s", 123456) outputs
________. (Note: * represents a space) 5)
A) ****123456 B) 12345***** C) 123456**** D) 23456*****
6) The following code displays ________.
double temperature = 50;
if (temperature >= 100)
System.out.println("too hot");
else if (temperature <= 40)
System.out.println("too cold");
else
System.out.println("just right");
6)
A) too cold B) too hot
C) too hot too cold just right D) just right
7) Which of the following code displays the area of a circle if
the radius is positive? 7)
A) if (radius >= 0) System.out.println(radius * radius *
3.14159);
B) if (radius != 0) System.out.println(radius * radius *
3.14159);

C) if (radius > 0) System.out.println(radius * radius * 3.14159);
D) if (radius <= 0) System.out.println(radius * radius *
3.14159);
8) ________ is the code with natural language mixed with Java
code. 8)
A) A flowchart diagram B) Java program
C) Pseudocode D) A Java statement
9) Analyze the following code:
if (x < 100) && (x > 10)
System.out.println("x is between 10 and 100");
9)
A) The statement compiles fine.
B) The statement has compile errors because (x<100) & (x > 10)
must be enclosed inside
parentheses and the println(…) statement must be put inside a
block.
C) The statement compiles fine, but has a runtime error.
D) The statement has compile errors because (x<100) & (x >
10) must be enclosed inside
parentheses.
10) In Java, the word true is ________. 10)
A) same as value 1 B) same as value 0
C) a Boolean literal D) a Java keyword
2

11) How many times will the following code print "Welcome to
Java"?
int count = 0;
do {
System.out.println("Welcome to Java");
} while (count++ < 10);
11)
A) 11 B) 0 C) 8 D) 9 E) 10
12) What is sum after the following loop terminates?
int sum = 0;
int item = 0;
do {
item++;
sum += item;
if (sum > 4) break;
}
while (item < 5);
12)
A) 5 B) 7 C) 6 D) 8
13) What is i after the following for loop?
int y = 0;
for (int i = 0; i<10; ++i) {
y += i;
}
13)

A) 9 B) 11 C) 10 D) undefined
Java"?
int count = 0;
while (count < 10) {
count++;
}
14)
A) 11 B) 8 C) 0 D) 10 E) 9
Java"?
int count = 0;
while (count++ < 10) {
}
15)
A) 0 B) 10 C) 9 D) 11 E) 8
3
16) What is the number of iterations in the following loop:
for (int i = 1; i < n; i++) {
// iteration
}

16)
A) 2*n B) n C) n + 1 D) n - 1
17) Analyze the following fragment:
double sum = 0;
double d = 0;
while (d != 10.0) {
d += 0.1;
sum += sum + d;
}
17)
A) The program never stops because d is always 0.1 inside the
loop.
B) After the loop, sum is 0 + 0.1 + 0.2 + 0.3 + ... + 1.9
C) The program does not compile because sum and d are
declared double, but assigned with
integer value 0.
D) The program may not stop because of the phenomenon
referred to as numerical inaccuracy
for operating with floating-point numbers.
18) What is Math.rint(3.5)? 18)
A) 3.0 B) 5.0 C) 4.0 D) 3 E) 4
19) Which of the following should be declared as a void
method? 19)
A) Write a method that checks whether current second is an
integer from 1 to 100.
B) Write a method that prints integers from 1 to 100.

C) Write a method that converts an uppercase letter to
lowercase.
D) Write a method that returns a random integer from 1 to 100.
20) Given the following method
static void nPrint(String message, int n) {
while (n > 0) {
System.out.print(message);
n--;
}
}
What is k after invoking nPrint("A message", k)?
int k = 2;
nPrint("A message", k);
20)
A) 2 B) 0 C) 1 D) 3
21) What is Math.ceil(3.6)? 21)
A) 3 B) 3.0 C) 4.0 D) 5.0
4
22) ________ is to implement one method in the structure chart
at a time from the top to the bottom. 22)
A) Bottom-up and top-down approach B) Top-down approach
C) Stepwise refinement D) Bottom-up approach
23) What is the output of the following program?

import java.util.Date;
public class Test {
public static void main(String[ ] args) {
Date date = new Date(1234567);
m1(date);
System.out.print(date.getTime() + " ");
m2(date);
System.out.println(date.getTime());
}
public static void m1(Date date) {
date = new Date(7654321);
}
public static void m2(Date date) {
date.setTime(7654321);
}
}
23)
A) 7654321 1234567 B) 1234567 7654321
C) 1234567 1234567 D) 7654321 7654321
24) Which of the following statement is most accurate? (Choose
all that apply.) 24)
A) An object may contain other objects.
B) A reference variable refers to an object.
C) An object may contain the references of other objects.
D) A reference variable is an object.
25) How many JFrame objects can you create and how many can
you display? 25)
A) three B) one C) two D) unlimited

26) An object is an instance of a ________. 26)
A) data B) class C) method D) program
5
27) Analyze the following code fragments that assign a boolean
value to the variable even.
Code 1:
if (number % 2 == 0)
even = true;
else
even = false;
Code 2:
even = (number % 2 == 0) ? true: false;
Code 3:
even = number % 2 == 0;
27)
A) Code 3 has a compile error, because you attempt to assign
number to even.
B) All three are correct, but Code 2 is preferred.
C) All three are correct, but Code 1 is preferred.
D) Code 2 has a compile error, because you cannot have true
and false literals in the conditional
expression.
E) All three are correct, but Code 3 is preferred.
28) What is the printout of the following switch statement?

char ch = 'b';
switch (ch) {
case 'a':
case 'b':
case 'c':
case 'd':
}
28)
A) bcd B) bbb C) bb D) abcd E) b
29) Suppose x=10 and y=10. What is x after evaluating the
expression (y > 10) && (x-- > 10)? 29)
A) 11 B) 9 C) 10
30) To add 0.01 + 0.02 + ... + 1.00, what order should you use
to add the numbers to get better accuracy? 30)
A) add 1.00, 0.99, 0.98, ..., 0.02, 0.01 in this order to a sum
variable whose initial value is 0.
B) add 0.01, 0.02, ..., 1.00 in this order to a sum variable whose
initial value is 0.
31) How many times are the following loops executed?
for (int i = 0; i < 10; i++)
for (int j = 0; j < i; j++)
System.out.println(i * j)
31)

A) 100 B) 10 C) 20 D) 45
6
32) Analyze the following code.
public class Test {
System.out.println(m(2));
}
public static int m(int num) {
return num;
}
public static void m(int num) {
System.out.println(num);
}
}
32)
A) The program runs and prints 2 once.
B) The program runs and prints 2 twice.
C) The program has a compile error because the two methods m
have the same signature.
D) The program has a compile error because the second m
method is defined, but not invoked in
the main method.
33) Which of the following is the best for generating random
integer 0 or 1? 33)

A) (int)Math.random()
B) (int)(Math.random() + 0.2)
C) (int)(Math.random() + 0.8)
D) (int)Math.random() + 1
E) (int)(Math.random() + 0.5)
34) Variables that are shared by every instances of a class are
________. 34)
A) private variables B) class variables
C) instance variables D) public variables
35) Which of the following operators are right-associative? 35)
A) + B) % C) * D) = E) &&
36) What is the number of iterations in the following loop:
for (int i = 1; i <= n; i++) {
// iteration
}
36)
A) n B) n + 1 C) n - 1 D) 2*n
37) What is Math.rint(3.6)? 37)
A) 4.0 B) 3.0 C) 5.0 D) 3
7
38) What code may be filled in the blank without causing syntax
or runtime errors:
public class Test {
java.util.Date date;

Test test = new Test();
System.out.println(________);
}
}
38)
A) test.date B) date.toString()
C) test.date.toString() D) date
39) Suppose x=10 and y=10 what is x after evaluating the
expression (y >= 10) || (x-- > 10)? 39)
A) 11 B) 9 C) 10
40) What is the value in count after the following loop is
executed?
int count = 0;
do {
} while (count++ < 9);
System.out.println(count);
40)
A) 8 B) 0 C) 9 D) 10 E) 11
8

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