Array -Java Programming MCQ Questions and Answers

1

In Java, arrays are objects of which class?

A) Array B) Collection C) ArrayList D) None of the above

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Answer & Solution

Answer: Option D

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2

How do you declare a one-dimensional array in Java?

A) int[] myArray; B) int myArray[]; C) Array myArray; D) All of the above

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Answer & Solution

Answer: Option A

Solution:

In Java, a one-dimensional array is declared by specifying the type of elements followed by square brackets and then the array name. The correct syntax is:
type[] arrayName;
Option A follows this syntax and is the correct way to declare a one-dimensional array in Java.
Option B is also a valid syntax but is less commonly used. Both Option A and Option B are equivalent.
Option C is incorrect as it attempts to use generics syntax, which is not allowed for arrays in Java.
Option D is incorrect because Option C is not a valid way to declare an array.

3

What is the default initial value of numeric elements in an array of type int in Java?

A) 0 B) 1 C) -1 D) Null

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Answer & Solution

Answer: Option A

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4

What is the correct way to initialize a two-dimensional array in Java?

A) int[][] myArray = {{1, 2}, {3, 4}}; B) int[2][2] myArray = {{1, 2}, {3, 4}}; C) int[2][2] myArray; myArray[0][0] = 1; myArray[0][1] = 2; myArray[1][0] = 3; myArray[1][1] = 4; D) None of the above

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Answer & Solution

Answer: Option A

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5

What does the length attribute of an array in Java represent?

A) The number of elements in the array B) The maximum value of elements in the array C) The length of the variable name D) The number of dimensions

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Answer & Solution

Answer: Option A

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6

How do you access an element in a one-dimensional array named myArray at index 3 in Java?

A) myArray[3] B) myArray(3) C) myArray.get(3) D) myArray.getElement(3)

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Answer & Solution

Answer: Option A

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7

What happens if you try to access an array element at an index that is out of bounds in Java?

A) It returns null. B) It throws an ArrayIndexOutOfBoundsException. C) It returns 0. D) It returns -1.

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Answer & Solution

Answer: Option B

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8

Which method is used to find the length of an array in Java?

A) length() B) size() C) getSize() D) length

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Answer & Solution

Answer: Option D

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9

What is the highest index of an array with 10 elements in Java?

A) 9 B) 10 C) 0 D) 1

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Answer & Solution

Answer: Option A

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10

Which of the following is a valid declaration and initialization of a String array in Java?

A) String[] names = {"Alice", "Bob", "Charlie"}; B) String names[] = new String[]{"Alice", "Bob", "Charlie"}; C) String[3] names = {"Alice", "Bob", "Charlie"}; D) Both A and B E) Both B and C

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Answer & Solution

Answer: Option D

Solution:

Option A initializes a String array named "names" with three elements: "Alice", "Bob", and "Charlie".
This is a valid and commonly used syntax for declaring and initializing a String array in Java.

Option B:

String names[] = new String[]{"Alice", "Bob", "Charlie"};

This syntax is also valid for declaring and initializing a String array in Java. However, it's less commonly used.

Option C:

String[3] names = {"Alice", "Bob", "Charlie"};

This syntax is invalid. In Java, when declaring an array, the size should not be specified in the square brackets.