All based on Zybooks AP Java with zylabs Please answer all

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?

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:

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 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?

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
{
      // 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?

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 ____.

8.0

9.0

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 ____.

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

char[][] table = new char[10][5];

How many columns are in the array seen in the accompanying figure?

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 ____.

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?

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 8

2 5 8

5 8 11