Java 2
Basic Elements of Java
- 1.
Suppose x = 2 and y = 3. If the statement x *= y; is executed once, what is the value of x?
- A.
2
- B.
3
- C.
5
- D.
6
Correct Answer
D. 6Explanation
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- 2.
Suppose x = 2 and y = 3. If the statement x *= y; is executed once, what is the value of y?
- A.
2
- B.
3
- C.
5
- D.
6
Correct Answer
B. 3Explanation
REF: 93Rate this question:
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- 3.
Which of the following is the correct syntax for commenting in Java?
- A.
# Enter Comments Here
- B.
""
- C.
/* Enter Comments Here*/
- D.
** Enter Comments Here **
Correct Answer
C. /* Enter Comments Here*/Explanation
REF: 91Rate this question:
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- 4.
The declaration int a, b, c; is equivalent to which of the following?
- A.
Int a b, c;
- B.
Int a, b, c;
- C.
Int abc;
- D.
Int a b c;
Correct Answer
B. Int a, b, c;Explanation
REF: 91 | 92Rate this question:
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- 5.
____ are executable statements that inform the user what to do.
- A.
Variables
- B.
Prompt lines
- C.
Named constants
- D.
Expressions
Correct Answer
B. Prompt linesExplanation
REF: 90Rate this question:
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- 6.
Which of the following is the newline character?
- A.
\r
- B.
\n
- C.
\l
- D.
\b
Correct Answer
B. \nExplanation
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- 7.
Consider the following program. // Insertion Point 1 public class CircleArea { // Insertion Point 2 static final float PI = 3.14 public static void main(String[]args) { //Insertion Point 3 float r = 2.0; float area; area = PI * r * r; System.out.println("Area = " + area); } // Insertion Point 4 } In the above code, where do the import statements belong?
- A.
Insertion Point 1
- B.
Insertion Point 2
- C.
Insertion Point 3
- D.
Insertion Point 4
Correct Answer
A. Insertion Point 1Explanation
REF: 82 | 83Rate this question:
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- 8.
What is the output of the following statement? System.out.println("Welcome \n Home");
- A.
WelcomeHome
- B.
Welcome Home
- C.
Welcome (on first line) Home (on second line)
- D.
Welcome \n Home
Correct Answer
C. Welcome (on first line) Home (on second line)Explanation
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- 9.
Suppose that x = 5 and y = 6. What is the output of the following Java statement? System.out.println("Sum of " + x + " and " + y + " = " + x + y);
- A.
Sum of 5 and 6 = 11
- B.
Sum of 5 and 6 = 56
- C.
Sum of x and y = 11
- D.
None of these
Correct Answer
B. Sum of 5 and 6 = 56Explanation
REF: 72 | 75Rate this question:
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- 10.
Suppose that x = 5 and y = 6. What is the output of the following Java statement? System.out.println("Sum of " + x + " and " + y + " = " + (x + y));
- A.
Sum of 5 and 6 = 11
- B.
Sum of x and y = 11
- C.
Sum of x and y = x + y
- D.
None of these
Correct Answer
A. Sum of 5 and 6 = 11Explanation
REF: 72 | 75Rate this question:
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- 11.
Consider the following sequence of statements. String str; int num1, num2; num1 = 13; num2 = 24; str = "The sum = " + num1 + num2; What is the final value stored in str?
- A.
The sum = 37
- B.
The sum = 13 24
- C.
The sum = 13 + 24
- D.
The sum = 1324
Correct Answer
D. The sum = 1324Explanation
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- 12.
Suppose that alpha and beta are int variables. The statement alpha = ++beta; is equivalent to the statement(s) ____.
- A.
Beta = beta + 1; alpha = beta;
- B.
Alpha = 1 + beta;
- C.
Alpha = alpha + beta;
- D.
None of these
Correct Answer
A. Beta = beta + 1; alpha = beta;Explanation
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- 13.
Suppose that alpha and beta are int variables. The statement alpha = beta++; is equivalent to the statement(s) ____.
- A.
Alpha = 1 + beta;
- B.
Alpha = alpha + beta;
- C.
Alpha = beta; beta = beta + 1;
- D.
None of these
Correct Answer
C. Alpha = beta; beta = beta + 1;Explanation
REF: 70 | 71Rate this question:
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- 14.
Given int one; double two; boolean four; Which of the following assignment statements are valid? (i) one = 7 + 3 % 4; (ii) 2.3 + 3.5 = two; (iii) four = (2 <= 3);
- A.
Only (i) is valid
- B.
(i) and (ii) are valid
- C.
(ii) and (iii) are valid
- D.
(i) and (iii) are valid
Correct Answer
A. Only (i) is validExplanation
REF: 54Rate this question:
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- 15.
Which of the following statements about a named constant is NOT true?
- A.
Its content cannot change during program execution.
- B.
Its value can be changed during program execution.
- C.
It is a memory location.
- D.
It is declared using the reserved word final.
Correct Answer
B. Its value can be changed during program execution.Explanation
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- 16.
What type of Java statement(s) stores a value in a variable?
- A.
Input
- B.
Output
- C.
Assignment
- D.
Both an input statement and an assignment statement
Correct Answer
D. Both an input statement and an assignment statementExplanation
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- 17.
Suppose that x and y are int variables and x = 10 and y = 20. After the statement: x = x + y; executes, the value of x is ____.
- A.
10
- B.
20
- C.
30
- D.
None of these
Correct Answer
C. 30Explanation
REF: 54Rate this question:
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- 18.
The length of the string "computer science" is:
- A.
14
- B.
15
- C.
16
- D.
18
Correct Answer
C. 16Explanation
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- 19.
Suppose that alpha is a double variable. What is the value of alpha after the following statement executes: alpha = 11.5 + (double)(15) / 2;
- A.
18.0
- B.
18.5
- C.
19.0
- D.
None of these
Correct Answer
C. 19.0Explanation
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- 20.
Suppose that x is an int variable. What is the value of x after the following statement executes: x = 15 + (int)(10.5) / 2;.
- A.
20
- B.
20.25
- C.
21
- D.
22
Correct Answer
A. 20Explanation
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- 21.
The expression (int)9.9 evaluates to ____.
- A.
9
- B.
9.0
- C.
9.9
- D.
10
Correct Answer
A. 9Explanation
REF: 49 | 50Rate this question:
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- 22.
The expression (double)(6 + 2) evaluates to ____.
- A.
7
- B.
8
- C.
8.0
- D.
10
Correct Answer
C. 8.0Explanation
REF: 49 | 50Rate this question:
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- 23.
The expression (int)6.9 + (int)7.9 evaluates to ____.
- A.
13
- B.
14
- C.
14.8
- D.
15
Correct Answer
A. 13Explanation
REF: 49 | 50Rate this question:
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- 24.
Operators that have two operands are called ____.
- A.
Unary operands
- B.
Binary operands
- C.
Operators
- D.
Expressions
Correct Answer
B. Binary operandsExplanation
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- 25.
The value of the expression 1 + 5 % 3 is ____.
- A.
0
- B.
2
- C.
3
- D.
4
Correct Answer
C. 3Explanation
REF: 45Rate this question:
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- 26.
The value of the expression 26 – 14 % 3 + 1 is ____.
- A.
0
- B.
1
- C.
24
- D.
25
Correct Answer
D. 25Explanation
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- 27.
The value of the expression 26 + 14 / 3 + 1 is ____.
- A.
10
- B.
14
- C.
29
- D.
31
Correct Answer
D. 31Explanation
REF: 45Rate this question:
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- 28.
Suppose that x, y and z are int variables. The expression x(y+z) in Java is written as ____.
- A.
X * y + z
- B.
X * (y + z)
- C.
Y + x * z
- D.
None of these
Correct Answer
B. X * (y + z)Explanation
REF: 40Rate this question:
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- 29.
Suppose that x, y, z, and w are int variables. The expression x(y-z)/w in Java is written as ____.
- A.
X * y - z / w
- B.
X * y - x * z / w
- C.
X * (y - z) / w
- D.
X (y - z) / w
Correct Answer
C. X * (y - z) / wExplanation
REF: 40Rate this question:
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- 30.
The value of the expression 36 – 15 % 2.0 + 1 is ____.
- A.
36
- B.
36.0
- C.
37
- D.
This is an illegal Java expression
Correct Answer
B. 36.0Explanation
REF: 46 | 47Rate this question:
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- 31.
The value of 3 % 9 is ___.
- A.
0
- B.
1/3
- C.
3
- D.
9
Correct Answer
C. 3Explanation
REF: 40Rate this question:
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- 32.
The value of the expression 17 % 7 is ____.
- A.
1
- B.
2
- C.
3
- D.
None of these
Correct Answer
C. 3Explanation
REF: 40Rate this question:
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- 33.
The ____ rules of a programming language tell you which statements are legal, or accepted by the programming language.
- A.
Semantic
- B.
Logical
- C.
Syntax
- D.
Grammatical
Correct Answer
C. SyntaxExplanation
REF: 33Rate this question:
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- 34.
Which of the following is NOT a special symbol in Java?
- A.
+
- B.
#
- C.
!=
- D.
?
Correct Answer
B. #Explanation
REF: 33Rate this question:
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- 35.
Which of the following is a reserved word in Java?
- A.
Char
- B.
Char
- C.
CHAR
- D.
None of these
Correct Answer
A. CharExplanation
REF: 34Rate this question:
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- 36.
Which of the following is NOT a reserved word in Java?
- A.
Int
- B.
Public
- C.
Static
- D.
Num
Correct Answer
D. NumExplanation
REF: 34Rate this question:
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- 37.
Which of the following is a valid Java identifier?
- A.
1Stop_and_go
- B.
#salaryForTheMonth
- C.
_Hello_There
- D.
MyNumber!
Correct Answer
C. _Hello_ThereExplanation
REF: 34Rate this question:
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- 38.
Which of the following is a legal identifier?
- A.
Program!
- B.
Program_1
- C.
1program
- D.
Program 1
Correct Answer
B. Program_1Explanation
REF: 34Rate this question:
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- 39.
All of the following are examples of integral data types EXCEPT ____.
- A.
Int
- B.
Char
- C.
Double
- D.
Byte
Correct Answer
C. DoubleExplanation
REF: 36Rate this question:
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- 40.
Which of the following is a valid int value?
- A.
46,259
- B.
46259
- C.
462.59
- D.
None of these
Correct Answer
B. 46259Explanation
REF: 37Rate this question:
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- 41.
What is the floating-point notation for 25.611?
- A.
2.5E1
- B.
2.6
- C.
2.561100E1
- D.
256.1100E1
Correct Answer
C. 2.561100E1Explanation
REF: 39Rate this question:
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- 42.
The value of the expression 44 / 10 is _____.
- A.
0.4
- B.
4
- C.
4.0
- D.
4.4
Correct Answer
B. 4Explanation
REF: 40Rate this question:
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