Java Arrays and Multidimensional Arrays Interview MCQ Questions and Answers

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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) -
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2) The Java Virtual Machine (JVM) implements arrays as ___ type.
A) Primitive
B) Object
C) -
D) -
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3) Unlike C-Arrays, the Java-Arrays have ___.
A) Names
B) Values
C) Methods and Fields
D) None
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4) An array declaration in Java without initialization ___ memory.
A) Does not allocate
B) Allocates memory
C) -
D) -
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5) In Java language, an array index starts with ___.
A) -1
B) 0
C) 1
D) Any integer
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6) Which are the special symbols used to declare an array in Java?
A) Braces { }
B) Parentheses ()
C) Square Brackets [ ]
D) Angled Brackets < >
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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 < >
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8) It is possible to skip initializing some elements of the array during Shorthand Initialization. (TRUE / FALSE)
A) FALSE
B) TRUE
C) -
D) -
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9) In Java, an array can be declared without initialization without mentioning the size. (TRUE / FALSE)
A) TRUE
B) FALSE
C) -
D) -
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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
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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
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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
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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
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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
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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
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16) What is the output of the below Java program? 
int ages[3] = {25, 27, 30};
System.out.println(ages[1]);
A) 25
B) 27
C) 30
D) Compile error
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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) -
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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
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19) An array in Java can be declared only of some predefined types. (TRUE/FALSE)
A) FALSE
B) TRUE
C) -
D) -
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20) The name of an array variable or identifier can start with ___.
A) A letter
B) Underscore ( _ )
C) Dollar Symbol ($)
D) All
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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) -
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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) -
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23) What is the default value of an element of Object type array?
A) 0
B) null
C) -1
D) Garbage value
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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
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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
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26) What is the default value of a char data type elements of an array in Java?
A) 'A'
B) '\0'
C) null
D) '\0' or null
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27) What is the default value of boolean data type elements of an array in Java?
A) true
B) false
C) -
D) -
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28) Allocating memory with the keyword "new" causes the array elements to carry default values. State TRUE or FALSE.
A) FALSE
B) TRUE
C) -
D) -
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29) What is the output of the below Java program? 
int balls[], rounds=3;
balls = new int[rounds];
for(int i=0; i<balls.length; i++)
    balls[i] = (i+1)*2;
for(int j=0; j<balls.length; j++)
    System.out.print(balls[j] + ",");
A) 0,2,4,
B) 1,2,3,
C) 2,4,6,
D) Compiler error
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30) What is the output of the below Java program with arrays? 
String[] ary = {"KITE", "AIR"};
String str = "PLANE";
ary[1] = str;
str = "FLY";
System.out.println(ary[1]);
A) AIR
B) PLANE
C) FLY
D) Compiler error
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31) An array of arrays in Java is called ___ array.
A) Bidirectional
B) Combo
C) Multidimensional
D) Multi-value
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32) A multidimensional array contains elements of the same data-type in all rows and columns. State TRUE or FALSE.
A) FALSE
B) TRUE
C) -
D) -
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33) An array of dimension N contains __ number of subscripts or brackets?
A) N-1
B) N
C) N+1
D) 10*N
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34) An array with two dimensions is called a two-dimensional array in Java. State TRUE or FALSE.
A) TRUE
B) FALSE
C) -
D) -
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35) Row number and Column number in a Multidimensional array start with ___.
A) -1
B) 0
C) 1
D) 2
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36) A 4-dimensional array is an array of ___ dimensional arrays.
A) 4
B) 3
C) 2
D) 1
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37) Choose the correct way of initializing a multidimensional array below.
A) 
int[][] code = {{1,2},{3,4,5}};
B) 
int[2][] code = {{1,2},{3,4,5}};
C) 
int[][] code={1,2,
              3,4,5};
D) All
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38) What is the output of the Java program with the multidimensional array? 
int[][] goats;
goats = new int[3][];
goats[0] = {1,2};
System.out.println(goats[0][1]);
A) 0
B) 1
C) 2
D) Compiler error
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39) State TRUE or FALSE. In a multidimensional array, the number of Columns in each Row can be different. 
1
2 3
4 5 6
A) FALSE
B) TRUE
C) -
D) -
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40) While mentioning the array size in a multidimensional array using the new keyword, the left-most script is mandatory. State TRUE or FALSE. 
int ary[][];
ary = new int[5][];//first dimension is compulsory.
A) FALSE
B) TRUE
C) -
D) -
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