Review

Question 1

The format specifier ________ is a placeholder for an int value.

Answer 1

%d

Question 2

What would be displayed as a result of executing the following code?
final int x = 22, y = 4;
y += x;
System.out.println(“x = “ + x + “, y = “ + y)

Answer 2

Error because named constants with final

Question 3

What is the value of z after the following code is executed?
int x = 5, y = 28;
float z;
z = (float) (y / x);

Answer 3

5.0

Question 4

How many times will the following do-while loop be executed?
int x = 11;
do
{
x += 20;
} while (x > 100);

Answer 4

1

Question 5

int x, y = 15;
x = y–;

Answer 5

15

Question 6

Scanner keyboard = new Scanner(System.in);
System.out.print(“Enter a number: “);
int number = keyboard.nextInt();
while (number < 100 || number > 500)
{
System.out.print(“Enter another number: “);
number = keyboard.nextInt();
}

Answer 6

range 100-500

Question 7

public static double methodA()
{
double a = 8.5 + 9.5;
return a;
}

Answer 7

18.0

Question 8

int x = 11;
do
{
x += 20;
} while (x <= 100);

Answer 8

5

Question 9

int temp = 200;

if (temp > 90) {
System.out.println(“This porridge is too hot.”);
}

if (temp < 70) {
System.out.println(“This porridge is too cold.”);
}
if (temp == 80) {
System.out.println(“This porridge is just right!”);}

Answer 9

The porridge is too hot

Question 10

The empty statement is denoted by what symbol?

Answer 10

semicolon

Question 11

a counter-controlled iteration is also known as

Answer 11

definite iteration

Question 12

System.out.printf(“%s”, “I love “, “Java”);

Answer 12

i love

Question 13

In a class containing methods with the same name, the methods are distinguished by ________.
Number of arguments
Types of arguments
Return type
(a) and (b)
(b) and (c)

Answer 13

a and b

Question 14

math methods

Answer 14

min(), max(), avg(), sin(), cos(), tan(), round(), ceil(), floor(), abs() etc.

Question 15

Which of the following methods is not in the Math class?
ceil
abs
parseInt
Log

Answer 15

parseInt

Question 16

Overloaded methods always have the same _________.
method name
return type
number of parameters
order of the parameters

Answer 16

method name

Question 17

Which of the following promotions of primitive types is not allowed to occur?
char to int.
double to float.
int to double.
short to long.

Answer 17

double to float

Question 18

Stacks

Answer 18

Lifo

Question 19

Any field declared with keyword ________ is constant.
static
const
constant
Final

Answer 19

final

Question 20

Which is a correct static method call of Math class method sqrt?
sqrt(900);
math.sqrt(900);
Math.sqrt(900);
Math math = new Math(); math.sqrt(900);

Answer 20

Math.sqrt(900);

Question 21

Which expression is equivalent to if (!(grade == sentinelValue))?
if (grade !== sentinelValue)
if (grade != sentinelValue)
! if (grade == sentinelValue)
! if (grade !== sentinelValue)

Answer 21

B if (grade != sentineValue)