All based on Zybooks = AP Java with zylabsPlease answer all questi.pdf

All based on Zybooks = AP Java with zylabs
Please answer all questions - no explanation of answers needed
QUESTION 1
char[][] table = new char[10][5];
How many rows are in the array seen in the accompanying figure?
0
5
10
15
QUESTION 2
The standard output object in Java is ____.
output
System.out
Sys.out
System.in
QUESTION 3
The length of the string "first java program" is:
16
18
19
20
1 points
QUESTION 4
The loop condition of a while loop is reevaluated before every iteration of the loop.
True
False
1 points
QUESTION 5
If str1 is “Hello” and str2 is “Hi”, which of the following could not be a result of
str1.compareTo(str2);?
-9
-5
-1
1

1 points
QUESTION 6
Both System.out.println and System.out.print can be used to output a string on the standard
output device.
True
False
1 points
QUESTION 7
In a method call statement, when passing an array as an actual parameter, you use only its name.
True
False
1 points
QUESTION 8
Which of the following is true about a while loop?
The body of the loop is executed at least once.
The logical expression controlling the loop is evaluated before the loop is entered and after the
loop exists.
The body of the loop may not execute at all.
It is a post-test loop
1 points
QUESTION 9
int x, y;
if (x < 4)
y = 2;
else if (x > 4)
{
if (x > 7)
y = 4;
else
y = 6;
}
else
y = 8;
Based on the code above, what is the value of y if x = 9?

2
4
6
8
1 points
QUESTION 10
The array index can be any nonnegative integer less than the array size.
True
False
1 points
QUESTION 11
When a program executes, the first statement to execute is always the first statement in the main
method.
True
False
1 points
QUESTION 12
Java stores two-dimensional arrays in a row order form in computer memory.
True
False
1 points
QUESTION 13
The statement dataType[][][] arrayName; would declare a two-dimensional array.
True
False
1 points
QUESTION 14
All the methods defined in a class must have different names.
True
False
1 points
QUESTION 15
Which of the following is NOT a reserved word in Java?
double
throws
static

num
1 points
QUESTION 16
Given the declaration
int[] list = new int[50];
the statement
System.out.println(list[0] + "..." + list[49]);
outputs all 50 components of the array list.
True
False
1 points
QUESTION 17
In the case of an infinite while loop, the while expression (that is, the loop condition) is always
true.
True
False
1 points
QUESTION 18
Consider the following program.
public class CircleArea
{
static Scanner console = new Scanner(System.in);
static final double PI = 3.14;
public static void main(String[]args)
{
doubler;
double area;
r = console.nextDouble();
area = PI * r * r;
System.out.println("Area = " + area);

}
}
To successfully compile this program, which of the following import statement is required?
import java.io.Scanner;
import java.util.Scanner;
import java.lang.Scanner;
No import statement is required
1 points
QUESTION 19
An identifier can be any sequence of characters and integers.
True
False
1 points
QUESTION 20
A single array can hold elements of many different data types.
True
False
1 points
QUESTION 21
Consider the following program.
// Insertion Point 1
public class CircleArea
{
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);

}
}
In the above code, where do the import statements belong?
Insertion Point 1
Insertion Point 2
Insertion Point 3
Insertion Point 4
1 points
QUESTION 22
Suppose that x is an int variable. Which of the following expressions always evaluates to false?
(x > 0) || (x <= 0)
(x > 0) || (x == 0)
(x > 0) && ( x <= 0)
(x >= 0) && (x == 0)
1 points
QUESTION 23
What is the value of alpha[4] after the following code executes?
int[] alpha = new int[5];
for (int j = 0; j < 5; j++)
alpha[j] = 2 * j - 1;
one
three
five
seven
1 points
QUESTION 24
If a = 4; and b = 3;, then after the statement a = b; executes, the value of b is 4 and the value of a
is 3.
True
False
1 points
QUESTION 25

The expression !(x <= 0) is true only if x is a positive number.
True
False
1 points
QUESTION 26
In a return method, the last line of the method must be a return statement.
True
False
1 points
QUESTION 27
The expression (int)8.7 evaluates to ____.
8
8.0
9.0
9
1 points
QUESTION 28
A loop is a control structure that causes certain statements to be executed over and over until
certain conditions are met.
True
False
1 points
QUESTION 29
What is stored in alpha after the following code executes?
int[] alpha = new int[5];
for (int j = 0; j < 5; j++)
{
alpha[j] = 2 * j;
if (j % 2 == 1)
alpha[j - 1] = alpha[j] + j;
}
alpha = {0, 2, 4, 6, 8}
alpha = {3, 2, 9, 6, 8}

alpha = {0, 3, 4, 7, 8}
alpha = {0, 2, 9, 6, 8}
1 points
QUESTION 30
Suppose that x and y are int variables and x = 7 and y = 8. After the statement: x = x * y - 2;
executes, the value of x is ____.
42
54
56
58
1 points
QUESTION 31
A counter-controlled loop should be used when the programmer knows the exact number of loop
iterations are needed.
True
False
1 points
QUESTION 32
In Java, a period is used to terminate a statement.
True
False
1 points
QUESTION 33
In Java, return is a reserved word.
True
False
1 points
QUESTION 34
When an array reference is passed to a method, the method can modify the elements of the array
object.
True
False
1 points
QUESTION 35
A local identifier is an identifier that is declared within a method or block and that is visible only
within that method or block.

True
False
1 points
QUESTION 36
An expression such as str.length(); is an example of a(n) ____.
system call
object call
class
method call
1 points
QUESTION 37
Suppose str1 and str2 are String variables. The expression (str1 == str2) determines whether str1
and str2 reference the same String object.
True
False
1 points
QUESTION 38
Just like the nesting of loops, Java allows the nesting of methods.
True
False
1 points
QUESTION 39
Suppose console is a Scanner object initialized with the standard input device. The expression
console.nextInt(); is used to read one int value and the expression console.nextDouble(); is used
to read two int values.
True
False
1 points
QUESTION 40
A compiler translates the assembly language instructions into machine language.
True
False
1 points
QUESTION 41
An identifier can be declared anywhere including within a class, and outside of every method
definition (and every block).

True
False
1 points
QUESTION 42
The following for loop executes 21 times. (Assume all variables are properly declared.)
for (i = 1; i <= 20; i = i + 1)
System.out.println(i);
True
False
1 points
QUESTION 43
Which of the following is the array subscripting operator in Java?
.
{}
new
[]
1 points
QUESTION 44
How many columns are in the array seen in the accompanying figure?
0
5
10
15
1 points
QUESTION 45
The digit 0 or 1 is called a ____.
bit
bytecode
Unicode
hexcode
1 points
QUESTION 46
The output of the following Java code is: Stoor.
int count = 5;

System.out.print("Sto");
do
{
System.out.print('o');
count--;
}
while (count >= 5);
System.out.println('r');
True
False
1 points
QUESTION 47
The expression (double)(5 + 4) evaluates to ____.
8
9
9.0
10.0
1 points
QUESTION 48
In Java, !, &&, and || are called logical operators.
True
False
1 points
QUESTION 49
int x, y;
if (x < 4)
y = 2;
else if (x > 4)
{
if (x > 7)
y = 4;
else
y = 6;

}
else
y = 8;
Based on the code above, what is the value of y if x = 4?
2
4
6
8
1 points
QUESTION 50
What is the output of the following code?
int count;
int num = 2;
for (count = 1; count < 2; count++)
{
num = num + 3;
System.out.print(num + " ");
}
System.out.println();
5
5 8
2 5 8
5 8 11
0
5
10
15
Solution
Question 1:

How many rows are in the array seen in the accompanying figure?
Answer : 5
Question 2: The standard output object in Java is ____.
Answer : System.out
Question 3: The length of the string "first java program" is:
Answer : 18

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