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 y?
- A.
2
- B.
3
- C.
5
- D.
6
- 2.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 **
- 3.____ are executable statements that inform the user what to do.
- A.
Variables
- B.
Prompt lines
- C.
Named constants
- D.
Expressions
- 4.Which of the following is the newline character?
- A.
\r
- B.
\n
- C.
\l
- D.
\b
- 5.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
- 6.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
- 7.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
- 8.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
- 9.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
- 10.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
- 11.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.
- 12.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
- 13.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
- 14.The length of the string "computer science" is:
- A.
14
- B.
15
- C.
16
- D.
18
- 15.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
- 16.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
- 17.The expression (int)9.9 evaluates to ____.
- A.
9
- B.
9.0
- C.
9.9
- D.
10
- 18.The expression (double)(6 + 2) evaluates to ____.
- A.
7
- B.
8
- C.
8.0
- D.
10
- 19.The expression (int)6.9 + (int)7.9 evaluates to ____.
- A.
13
- B.
14
- C.
14.8
- D.
15
- 20.Operators that have two operands are called ____.
- A.
Unary operands
- B.
Binary operands
- C.
Operators
- D.
Expressions
- 21.The value of the expression 1 + 5 % 3 is ____.
- A.
0
- B.
2
- C.
3
- D.
4
- 22.The value of the expression 26 – 14 % 3 + 1 is ____.
- A.
0
- B.
1
- C.
24
- D.
25
- 23.The value of the expression 26 + 14 / 3 + 1 is ____.
- A.
10
- B.
14
- C.
29
- D.
31
- 24.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
- 25.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
Questions: 93 | Attempts: 14574 | Last updated: Jul 20, 2020
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