Java Arrays and Multidimensional Arrays Interview MCQ Questions and Answers | MCQ Questions and Answers on Java Arrays and Multidimensional Arrays
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Go through Java Theory Notes Arrays and Multidimensional Arrays before reading these objective questions.
1) An Array in Java is a collection of elements of ___ data type.
A) Same
B) Different
C) -
D) -
Answer [=]
A
2) The Java Virtual Machine (JVM) implements arrays as ___ type.
A) Primitive
B) Object
C) -
D) -
Answer [=]
B
Explanation:
That is the reason why Java Array has predefined methods.
3) Unlike C-Arrays, the Java-Arrays have ___.
A) Names
B) Values
C) Methods and Fields
D) None
Answer [=]
C
4) An array declaration in Java without initialization ___ memory.
A) Does not allocate
B) Allocates memory
C) -
D) -
Answer [=]
A
Explanation:
Only initialization causes memory to be allocated.
5) In Java language, an array index starts with ___.
A) -1
B) 0
C) 1
D) Any integer
Answer [=]
B
6) Which are the special symbols used to declare an array in Java?
A) Braces { }
B) Parentheses ()
C) Square Brackets [ ]
D) Angled Brackets < >
Answer [=]
C
7) Which are the special symbols used to initialize an array at the time of the declaration itself?
A) Parentheses ( )
B) Square Brackets [ ]
C) Braces { }
D) Angled Brackets < >
Answer [=]
C
Explanation:
int[] nums = {1,3,6};
8) It is possible to skip initializing some elements of the array during Shorthand Initialization. (TRUE / FALSE)
A) FALSE
B) TRUE
C) -
D) -
Answer [=]
A
Explanation:
No, you can not skip any elements. All elements need to be initialized in one go or at the same time.
9) In Java, an array can be declared without initialization without mentioning the size. (TRUE / FALSE)
A) TRUE
B) FALSE
C) -
D) -
Answer [=]
A
Explanation:
It is a Lazy initialization of an array.
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10) What is the output of the below Java code snippet with arrays?
static int[] nums;
public static void main(String args[])
{
System.out.println(nums.length);
}
A) 0
B) null
C) Compiler error
D) Runtime Exception — Null Pointer Exception
Answer [=]
D
11) What is the output of the below Java program?
int[] marks = {35,65,95};
System.out.print(marks.length + “,” + marks[1]);
A) 2,65
B) 3,95
C) 3,65
D) Compiler error
Answer [=]
C
Explanation:
Array index starts with Zero (0). So marks[1] represents the second element.
12) What is the output of the below Java code snippet?
int[] balls = {};
System.out.print(balls.length);
A) 0
B) -1
C) 1
D) Compiler error
Answer [=]
A
13) Which is the correct way of knowing Array Size in Java?
A)
//int[] ary;
ary.length()
B)
//int[] ary;
ary.length
C)
//int[] ary;
ary->length()
D)
//int[] ary;
ary->length
Answer [=]
B
Explanation:
“length” is a field, not a method. So, parentheses are not required.
14) What is the output of the below Java program with arrays?
String[] colors = {“RED”;”YELLOW”;”WHITE”};
System.out.print(colors[2]);
A) RED
B) YELLOW
C) WHITE
D) Compiler error
Answer [=]
D
Explanation:
Array elements must be separated with Comma(,)s.
15) What is the output of the below Java program with arrays?
public class Polo {
public static void main(String args[])
{
String[] computer = {“RAM”,”HDD”,”MOUSE”};
String[] parts = {computer[0],computer[2]};
System.out.print(parts[1]);
}
}
A) RAM
B) HDD
C) MOUSE
D) Compiler error
Answer [=]
C
16) What is the output of the below Java program?
int ages[3] = {25, 27, 30};
System.out.println(ages[1]);
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A) 25
B) 27
C) 30
D) Compile error
Answer [=]
D
Explanation:
We should not mention the array size at the time of Shorthand Initialization.
Error: Unresolved compilation problem:
Syntax error on token “3”, delete this token
So make it like
int ages[] = {25, 27, 30};
17) We should not specify the array size if declaration and initialization are done at the same time. (TRUE / FALSE)
A) FALSE
B) TRUE
C) -
D) -
Answer [=]
B
Explanation:
WRONG:
int ary[2]={34,45};
RIGHT:
int ary[] ={34,45};
18) If an index of an element is N, what is its actual position in the array?
A) N-1
B) N
C) N+1
D) N+2
Answer [=]
C
Explanation:
Array index starts with 0. So, an index of 6 means 7th position. An index of N means, N+1 position.
19) An array in Java can be declared only of some predefined types. (TRUE/FALSE)
A) FALSE
B) TRUE
C) -
D) -
Answer [=]
A
Explanation:
An array can be of any data type, primitive or Object type.
20) The name of an array variable or identifier can start with ___.
A) A letter
B) Underscore ( _ )
C) Dollar Symbol ($)
D) All
Answer [=]
D
21) Shorthand array initialization in Java needs the keyword “new” to allocate memory to the array and elements. State TRUE or FALSE.
A) FALSE
B) TRUE
C) -
D) -
Answer [=]
A
Explanation:
Only lazy initialization of array needs the keyword “new” to allocate memory.
22) Lazy initialization of array requires the keyword “new” to allocate memory to the array and its elements. State TRUE or FALSE.
A) FALSE
B) TRUE
C) -
D) -
Answer [=]
B
Explanation:
int[] ary;
ary = new int[5];
23) What is the default value of an element of Object type array?
A) 0
B) null
C) -1
D) Garbage value
Answer [=]
B
Explanation:
Objects can be String, ArrayList, HashMap, HashSet etc.
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24) What is the default value of byte, short, int or long data type elements of an array in Java?
A) -1
B) 1
C) 0
D) Garbage value
Answer [=]
C
25) What is the default value of float or double data type elements of an array in Java?
A) 0
B) 0.0
C) 1
D) 1.0
Answer [=]
B
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