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Which of the following about Java arrays is true?
(i) Array components must be of the same type.
(ii) The array index must evaluate to a nonnegative integer less than the length.

Select one:

a. Both (i) and (ii)

b. Only (ii)

c. None of these

d. Only (i)

Question 2

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int[] alpha = new int[5];

alpha[0] = 22;
alpha[1] = 33;

System.out.println(alpha[0] + " " + alpha[1] + " " + alpha[5]);


What is the output of the code fragment above?

Select one:

a. 0 22 33

b. 22 33 88

c. 22 33 0

d. This program throws an exception.

Question 3

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Which of the following declares an array of int named beta?

Select one:

a. int beta;

b. int beta = int[];

c. int[] beta;

d. new int beta[];

Question 4

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Given the following method heading

public static void mystery(int list[], int size)

and the declaration

int[] alpha = new int[75];

Which of the following is a valid call to the method mystery?

Select one:

a. None of these

b. mystery(alpha[75], 50);

c. mystery(alpha, 40);     

d. mystery(alpha[], 50);

Question 5

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Given the method heading

public static void strange(int a, int b)

and the declaration

int[] alpha = new int[20];
int[] beta = new int[25];

Which of the following is a valid call to the method strange?

Select one:

a. strange(alpha[10], alpha[15]);

b. strange(alpha[5], beta);

c. strange(alpha, beta[20]);

d. strange(alpha[0], beta[25]);

Question 6

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Which of the following statements creates alpha, an array of 5 components of the type int, and initializes each component to 10?

(i)  int[] alpha = {10, 10, 10, 10, 10};
(ii) int[5] alpha = {10, 10, 10, 10, 10}

Select one:

a. Only (ii)

b. Only (i)

c. Both (i) and (ii)

d. None of these

Question 7

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given this array declaration:

int [] list = { 2, 4, 3, 99, 23, 5, 11, 21, 75, 3, 51, 15, 12 };

How can you sort the array in numerical order from lowest to highest?

Select one:

a. sort(list);

b. list.sort();

c. sortArray(list);

d. Arrays.sort(list);

Question 8

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


How many columns are in the array above?

Select one:

a. 5

b. 15

c. 0

d. 10

Question 9

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


How many dimensions are in the array above?

Select one:

a. 5

b. 1

c. 10

d. 2

Question 10

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Given the declaration

int[] gamma = new int[100];
      
Which of the following for loops set the index of gamma out of bounds?

(i)
      for (int j = 0; j <= 99; j++)
          System.out.print(gamma[j] + " ");
(ii)
      for (int j = 1; j <= 100; j++)
          System.out.print(gamma[j] + " ");
(iii)
      for (int j = 0; j < 100; j++)
          System.out.print(gamma[j] + " ");

Select one:

a. All (i), (ii), and (iii)

b. Only (i)

c. Only (ii)

d. Only (iii)

Question 11

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Consider the following declaration.
     

double[] sales = new double[100];

Which of the following will correctly initializes all the components of the array  sales to 25.0.

(i)
      for (int j = 0; j < 99; j++)
          sales[j] = 25.0;

(ii)
      for (j = 1; j < 100; j++)
          sales[j] = 25.0;

Select one:

a. Only (i)

b. Both (i) and (ii)

c. None of these

d. Only (ii)

Question 12

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Consider the following declaration.

     
int[] beta = new int[3];
int j;

Which of the following input statements correctly input values from the scanner in order into the elements of beta? (Assume that console is a Scanner object initialized to the standard input device.)

(i)
      beta[0] = console.nextInt();
      beta[1] = console.nextInt();
      beta[2] = console.nextInt();

(ii)
      for (j = 0; j < 3; j++) {
          beta[j] = console.nextInt();
      }

Select one:

a. Only (ii)

b. None of these

c. Both (i) and (ii)

d. Only (i)

Question 13

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which of these import statements will allow you to use the File class?

Select one:

a. import java.FileIO.*;

b. import java.util.*;

c. import java.io.*;

d. import java.Files;

Question 14

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When you get this error exception:

java.util.NoSuchElementException

From a scanner object declared as

Scanner fin = new Scanner(new File("data.txt"));

When your code executes

list[10] = fin.nextInt();

What does the error mean?

Select one:

a. reading past the end of the line in a file

b. tying to read a string into a int

c. tying to read beyond the end of a file

d. reading a file into the wrong element of an array

Question 15

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Consider the following statements:

int[] hits = {5, 7, 9, 11, 13, 15};

What is the number of elements in the array hits.

Select one:

a. 15

b. 5

c. 0

d. 6

Question 16

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Consider the following statements:

int[] hits = {5, 7, 9, 11, 13, 15};   //Line 1

public void print(int[] list)         //Line 2
{                                     //Line 3
    ...                               //Line 4
}                                     //Line 5

print(hits);                          //Line 6

In Line 6 what is being passed into the method call statement?

Select one:

a. A reference to the array object hits

b. 10

c. A copy of the array hits

d. The value of the elements of hits

Question 17

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you are reading the following file data ( indicate where new lines are in the file)

10.6 Tom Jones

You already have a Scanner object named input that can read the file.

After the following code, what is the value in the variable x after this code runs?

double score = input.nextDouble();
String x = input.nextLine();

Select one:

a. "Tom Jones"

b. "Jones"

c. "Tom"

d. ""

Question 18

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What import statement do you need to read files?

Select one:

a. import java.file.*;

b. import java.io.*;

c. import java.util.*;

d. import java.fileio.*;

Question 19

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You see this error message:

unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown

type the exact code in the correct case in the area provided to fix this error within the main method declaration below:

public static void main(String[] args) Answer  {

Question 20

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After this line of code:

File f = new File("data.txt");

If the file can be opened and read, then the expression f.canRead() will return the value of true.

Select one:

True

False

Question 21

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Consider the boolean value after the followin code runs:

int [] list1 = { 1, 2, 3 };

int [] list2 = { 1, 2, 3 };

boolean areEqual = ( list1 == list2 )

The value of areEqual will now be true since the two arrays are equal.

Select one:

True

False

Question 22

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if list is an array of integers, then you can use the special for each loop construct like this to print out the array.

foreach( int i in list) {

System.out.println(i);

}

Select one:

True

False

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Explanation / Answer

Answered Everything Correctly, If u want any Further Explanation of anything or any doubts , Do ask me , plzz do Rate :)

1) A --> Both i) and ii)

2) D , out of bounds exception as alpha[5] is not in range.

3) C

4) C

5) A

6) A

7) D

8) A

9) D

10) C

11) A

12) C

13) C

14) D

15) D

16) A

17) A

18) B

19) public static void main(String []args) throws FileNotFoundException{
        //You can write any Code Here...and The exception will be thrown if there.
     }

20) True

21) False

22) False

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