MCQ

Java MCQ – Multiple Choice Questions and Answers – Array – Part 1

This collection of Java Multiple Choice Questions and Answers (MCQs): Quizzes & Practice Tests with Answer focuses on “Java Array”.
 

1. Array is a collection of ________.

A same type of elements

B different type of elements

C heterogeneous data

D Both A and C

A
An array is a collection of similar type of elements which has contiguous memory location.
 

2. In Java arrays are ________.

A objects

B object references

C primitive data type

D None of the above

A
In java an array is a container object that contains a fixed number of values of a single type. The size of an array is fixed when the array is created. After creation, its length is fixed.
 

3. We access data in Array using ________.

A Operator

B Variable

C Index

D Pointer

C
We access data in Array using index.
 
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4. On the point of array initialization which is required to specify?

A Row

B Column

C Row and Column

D None of the above

A
Row is essential to specify when initializing an array. Example:

int[] arr = new int[20];
 

5. Which declaration is valid ?

A char[] arr = new char();

B char[] arr = new char[6];

C char[] arr = new char(7);

D char[] arr = new char[];

B
Syntax for declaring an array in Java is: dataType[] arr = new dataType[Size];

As a result, option (A) and option (C) are wrong as parentheses ( ) is used in place of square brackets [ ].
Option (D) is wrong as the size of the array is missing.

 

6. Array can allocate __________.

A Static Memory

B Dynamic Memory

C Automatic

D None of the above

A
Arrays are static that can store a specific type of variables. Thus these arrays need to be initialized at the compile time.
 

7. Which is wrong declaration of array?

A int [] arr = new int[10];

B int arr[] = new int[10];

C int arr[] = new int[10];

D int arr[] = int [10] new;

D
int arr[] = int [10] new; is a wrong declaration because Operator new must be followed by array type and array size.
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8. Index in array start with ______.

A -1

B 0

C 1

D null

B
Index in array start with 0.
 

9. Which is used to declare, create, and initlaize an array?

A int arr [][] = {1, 2, 3};

B int [] arr = (1, 2, 3);

C int arr [] = {1, 2, 3};

D int [] arr = {};

C
int arr [] = {1, 2, 3}; is used to declare, create, and initlaize an array, so Option A is incorrect because it initializes an int array with String literals. Option B is incorrect because it uses something other than curly braces for the initialization. Option C is incorrect because it provides initial values for only one dimension, despite the declared array is a two-dimensional array.
 

10. We can determine the length of an array using __________.

A sizeof(array)

B array.len

C array.length

D array.sizeof()

C
We can determine the length of an array using array.length.
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