Question 1

Suppose a Scanner object is created as follows: Scanner input = new Scanner(System.in); What method do you use to read an int value?

Accepted Answer

input.nextInt();

Question 2

The following code fragment reads in two numbers: Scanner input = new Scanner(System.in); int i = input.nextInt(); double d = input.nextDouble(); What are the correct ways to enter these two numbers?

Accepted Answer

Enter an integer, a space, a double value, and then the Enter key.  Enter an integer, two spaces, a double value, and then the Enter key. Enter an integer, an Enter key, a double value, and then the Enter key

Question 3

_______ is the code with natural language mixed with Java code

Accepted Answer

Pseudocode

Question 4

If you enter 1 2 3, when you run this program, what will be the output?  import java.util.Scanner;  public class Test1 {  public static void main(String[] args) {  Scanner input = new Scanner(System.in);  System.out.print(\"Enter three numbers: \");  double number1 = input.nextDouble();  double number2 = input.nextDouble();  double number3 = input.nextDouble();   // Compute average  double average = (number1 + number2 + number3) / 3;   // Display result  System.out.println(average);  } }

Accepted Answer

2.0

Question 5

What is the exact output of the following code?   double area = 3.5;  System.out.print(\"area\");  System.out.print(area);

Accepted Answer

area3.5

Question 6

Every letter in a Java keyword is in lowercase?

Accepted Answer

true

Question 7

Which of the following is a valid identifier?

Accepted Answer

$343 radius

Question 8

Which of the following are correct names for variables according to Java naming conventions?

Accepted Answer

radius findArea

Question 9

is the Java assignment operator

Accepted Answer

=

Question 10

To assign a value 1 to variable x, you write

Accepted Answer

x = 1;

Question 11

Which of the following assignment statements is incorrect

Accepted Answer

i == j == k == 1; i = 1 = j = 1 = k = 1;

Question 12

To declare a constant MAX_LENGTH inside a method with value 99.98, you write

Accepted Answer

final double MAX_LENGTH = 99.98;

Question 13

Which of the following is a constant, according to Java naming conventions?

Accepted Answer

MAX_VALUE COUNT

Question 14

To improve readability and maintainability, you should declare _________ instead of using literal values such as 3.14159.

Accepted Answer

constants

Question 15

According to Java naming convention, which of the following names can be variables?

Accepted Answer

totalLength findArea

Question 16

Which of these data types requires the most amount of memory?

Accepted Answer

long

Question 17

If a number is too large to be stored in a variable of the float type, it _____________

Accepted Answer

causes overflow

Question 18

Analyze the following code:  public class Test {  public static void main(String[] args) {  int n = 10000 * 10000 * 10000;  System.out.println(\"n is \" + n);  } }

Accepted Answer

The result of 10000 * 10000 * 10000 is too large to be stored in an int variable n. This causes an overflow and the program continues to execute because Java does not report errors on overflow.

Question 19

What is the result of 45 / 4?

Accepted Answer

11

Question 20

Which of the following expression results in a value 1?

Accepted Answer

37 % 6

Question 21

24 % 5 is _____

Accepted Answer

4

Question 22

-24 % 5 is _____

Accepted Answer

-4

Question 23

-24 % -5 is _____

Accepted Answer

-4

Question 24

Math.pow(2, 3) returns __________.

Accepted Answer

8.0

Question 25

Math.pow(4, 1.0 / 2) returns __________.

Accepted Answer

2.0

Question 26

The __________ method returns a raised to the power of b.

Accepted Answer

Math.pow(a, b)

Question 27

To declare an int variable number with initial value 2, you write

Accepted Answer

int number = 2;

Question 28

Analyze the following code.  public class Test {  public static void main(String[] args) {  int month = 09;  System.out.println(\"month is \" + month);  } }

Accepted Answer

The program has a syntax error, because 09 is an incorrect literal value.

Question 29

Which of the following are the same as 1545.534?

Accepted Answer

A. 1.545534e+3 B. 0.1545534e+4 C. 1545534.0e-3 D. 154553.4e-2

Question 30

The expression 4 + 20 / (3 - 1) * 2 is evaluated to

Accepted Answer

24

Question 31

To add a value 1 to variable x, you write

Accepted Answer

x += 1;  x = x + 1; x = 1 + x;

Question 32

To add number to sum, you write (Note: Java is case-sensitive)

Accepted Answer

sum = sum + number; sum += number;

Question 33

Suppose x is 1. What is x after x += 2?

Accepted Answer

3

Question 34

What is x after the following statements?  int x = 2; int y = 1; x *= y + 1;

Accepted Answer

x is 4

Question 35

What is x after the following statements?  int x = 1; x *= x + 1;

Accepted Answer

x is 2.

Question 36

Which of the following statements are the same?  (A) x -= x + 4 (B) x = x + 4 - x (C) x = x - (x + 4)

Accepted Answer

(A) and (C) are the same

Question 37

Are the following four statements equivalent? number += 1; number = number + 1; number++;  ++number;

Accepted Answer

Yes

Question 38

What is the value of i printed? public class Test {  public static void main(String[] args) {  int j = 0;  int i = ++j + j * 5;   System.out.println(\"What is i? \" + i);  } }

Accepted Answer

6  Explanation: Operands are evaluated from left to right in Java. The left-hand operand of a binary operator is evaluated before any part of the right-hand operand is evaluated. This rule takes precedence over any other rules that govern expressions. Therefore, ++j is evaluated first, and returns 1. Then j*5 is evaluated, returns 5.

Question 39

What is the value of i printed in the following code?  public class Test {  public static void main(String[] args) {  int j = 0;  int i = j++ + j * 5;   System.out.println(\"What is i? \" + i);  } }

Accepted Answer

5  Explanation: Same as before, except that j++ evaluates to 0.

Question 40

What is y displayed in the following code?  public class Test {  public static void main(String[] args) {  int x = 1;  int y = x++ + x;  System.out.println(\"y is \" + y);  } }

Accepted Answer

y is 3.

Question 41

public class Test {  public static void main(String[] args) {  int x = 1;  int y = x + x++;  System.out.println(\"y is \" + y);  } }

Accepted Answer

y is 2  Explanation: When evaluating x + x++, x is evaluated first, which is 1. X++ returns 1 since it is post-increment and 2. Therefore y is 1 + 1.

Question 42

To assign a double variable d to a float variable x, you write

Accepted Answer

x = (float)d;

Question 43

Which of the following expressions will yield 0.5?

Accepted Answer

(double) (1 / 2)  (double) 1 / 2  1.0 / 2

Question 44

What will be displayed by the following code?  double x = 5.5; int y = (int)x; System.out.println(\"x is \" + x + \" and y is \" + y);

Accepted Answer

x is 5.5 and y is 5

Question 45

Which of the following assignment statements is illegal?

Accepted Answer

int t = (int)false; int t = 4.5;

Question 46

What is the value of (double)5/2?

Accepted Answer

2.0

Question 47

Which of the following expression results in 45.37?

Accepted Answer

(int)(45.378 * 100) / 100.0

Question 48

The expression (int)(76.0252175 * 100) / 100 evaluates to _________.

Accepted Answer

76

Question 49

If you attempt to add an int, a byte, a long, and a double, the result will be a __________ value.

Accepted Answer

double

Question 50

_____________ is a formal process that seeks to understand the problem and document in detail what the software system needs to do

Accepted Answer

Requirements specification

Question 51

_____________ seeks to analyze the data flow and to identify the system\'s input and output.

Accepted Answer

System analysis

Question 52

Which of the following is the correct expression of character 4?

Accepted Answer

\'4\'

Question 53

A Java character is stored in __________.

Accepted Answer

two bytes

Question 54

Suppose x is a char variable with a value \'b\'. What will be displayed by the statement System.out.println(++x)?

Accepted Answer

c

Question 55

Which of the following statement prints smithexam1test.txt?

Accepted Answer

System.out.println(\"smithexam1test.txt\");

Question 56

Suppose i is an int type variable. Which of the following statements display the character whose Unicode is stored in variable i?

Accepted Answer

System.out.println((char)i);

Question 57

The Unicode of \'a\' is 97. What is the Unicode for \'c\'?

Accepted Answer

99

Question 58

Will System.out.println((char)4) display 4?

Accepted Answer

no  Explanation: The Unicode is to be displayed, not number 4.

Question 59

What will be displayed by System.out.println(\'z\' - \'a\')?

Accepted Answer

25

Question 60

An int variable can hold __________.

Accepted Answer

\'x\' 120

Question 61

Which of the following assignment statements is correct?

Accepted Answer

\'d\'; char c = 100; Explanation: Choice (B) is also correct, because an int value can be implicitly cast into a char variable. The Unicode of the character is the int value. In this case, the character is d

Question 62

\'3\' - \'2\' + \'m\' / \'n\' is ______.

Accepted Answer

1

Question 63

The expression \"Java \" + 1 + 2 + 3 evaluates to ________.

Accepted Answer

Java 123

Question 64

Note that the Unicode for character A is 65. The expression \"A\" + 1 evaluates to ________.

Accepted Answer

A1

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