Array

Question 1

A _____________ is a way of organizing and
storing data so that it can be accessed and
modified efficiently.

Answer 1

data structure

Question 2

________ in Java are __________(consisting of
parts all of the same kind.) data structures
implemented in Java as objects.

Answer 2

Arrays
homogeneous

Question 3

A specific element in an array is accessed by its
_______. Arrays offer a convenient means of grouping
related information.

Answer 3

index

Question 4

An ________ in an array is a single value stored at a
particular position. Each element shares the same
data type as the array.

Answer 4

element

Question 5

An __________ is the position of anelement inside an array. In Java, array indices start from 0 (not 1).

Answer 5

index (plural: indices)

Question 6

A __________ is the physical address in
computer memory (RAM) where an array stores its
elements.

Answer 6

memory location

Question 7

What are the typesof Java Array

Answer 7

Single Dimensional Array
Double Dimensional Array
Multi Dimensional Array

Question 8

You can imagine a 1D array as a row, where elements are stored one
after another.

Answer 8

Single Dimensional Arrays

Question 9

A two-dimensional (2D) array can be visualized as a table or a matrix. It contains rows and columns.

Answer 9

Double Dimensional Arrays

Question 10

Each element is initialized to a default value, a process known as _________. ____________ is initialization of variables to a default value, as in the initialization of array elements when an array is __________.

Answer 10

auto-initialization
Auto-Initialization
constructed

Question 11

A ______________ in Java
is a structured way of storing multiple
values of the same data type under a
single variable name.

Answer 11

one-dimensional array (1D array)

Question 12

The enhanced for loop, also called the _______, is a simplified way to iterate through arrays and collections. It eliminates the need for index tracking, making the code cleaner and easier to read.

Answer 12

for each loop

Question 13

Accessing an index that is outside the valid range of the array causes a
runtime error.

Answer 13

Array Index Out of Bounds Exception

Question 14

Arrays have a fixed size—once created, they cannot grow or
shrink.

Answer 14

Fixed Size Limitation

Question 15

Java provides various utility methods to work with
arrays through the Arrays class in the java.util
package. These methods help with______,
_______, _____, _______, and _________
arrays efficiently.

Answer 15

sorting
searching
copying
comparing
filling

Question 16

The equals() method checks if
two arrays contain the same
elements in the same order.

Answer 16

Arrays.equals()

Question 17

The sort() method sorts an array in
ascending order.

Answer 17

Arrays.sort() –

Question 18

The fill() method sets all elements in an array to a
specific value.

Answer 18

Arrays.fill()

Question 19

The copyOf() method creates a new array with the
same elements as the original.

Answer 19

Arrays.copyOf()

Question 20

is used to
search for an element in a sorted array efficiently.

Answer 20

Arrays.binarySearch() method

Question 21

method is used
to convert a String into a
character array (char[])

Answer 21

toCharArray()

Question 22

A ________ is an array of arrays.
It stores data in rows and columns
(tabular format).

Answer 22

2D array

Question 23

Elements are accessed using two
indices: row index and column index.
Also called __________
because they use more than one
dimension (row and column).

Answer 23

multidimensional arrays

Question 24

Elements are stored row by row in
memory.

Answer 24

Row-Major Order

Question 25

Elements are stored column by column in memory

Answer 25

Column-Major Order

Question 26

_______ are stored in contiguous memory locations.

Answer 26

Arrays

Question 27

Arrays are stored in _________________.

Answer 27

contiguous memory locations

Question 28

Elements are accessed using ____________.

Answer 28

numeric indexing

Question 29

A ____________ 2D array stores elements of different data types.

Answer 29

heterogeneous

Question 30

Gives the number of rows in the 2D array.

Answer 30

numbers.length

Question 31

Iterates over each row before moving to the next.

Answer 31

Row-Major Order Traversal

Question 32

Iterates over each column before moving to the next.

Answer 32

Column-Major Order Traversal

Question 33

2D array is an array of _____.

Answer 33

arrays

Question 34

It stores data in ____ and ____ (tabular format).

Answer 34

rows columns

Question 35

It stores data in rows and column (_____).

Answer 35

tabular format

Question 36

Elements are accessed using two indices.______ and ______

Answer 36

Row index and column index

Question 38

What is columns

Answer 38

Vertical Elements

Question 39

______ are accessed using two indices

Answer 39

Elements

Question 40

2D is also called__________ because they use more than one dimensions.

Answer 40

Multidimensional arrays

Question 41

2D is commonly used in programming to ______ and______ data.

Answer 41

Store Manipulate

Question 42

What is rows?

Answer 42

Horizontal elements

Question 42

Java treats a 2D array as a _______ of 1D arrays.

Answer 42

collection

Question 43

Each row in a 2D array is _____ to 1D array.

Answer 43

Pointer

Question 44

Syntax for declaring 2D array:

Answer 44

Two square brackets

Question 45

Specify the number of rows but leave columns uninitialized.

Answer 45

Double-Dimensional array with only rows initialized.

Question 46

Creates a _________(rows can have different column sizes).

Answer 46

Jagged array

Question 47

Arrays are stored in __________.

Answer 47

contagious memory locations.

Question 48

Elements are accessed 1using _______

Answer 48

numeric indexing

Question 49

____________ in Java are like the basic units or building blocks of a Java program.

Answer 49

Methods

Question 50

A method is a ___________ that performs a specific task or operation.

Answer 50

group of code

Question 51

A method is a group of code that performs a ____________.

Answer 51

specific task or operation

Question 52

a method is a collection of __________ that work together to complete a particular job.

Answer 52

statements

Question 53

Applications of 2D Arrays: Used in mathematics to represent __________ and ________.

Answer 53

matrices complex data structures

Question 54

____________ Can store: ______ ________ Other types of data.

Answer 54

Images. Text.

Question 55

Applications of 2D Arrays: Useful for __________ and ___________.

Answer 55

data analysis visualization

Question 56

Java treats a __________ as a collection of 1D arrays.

Answer 56

2D array

Question 57

Java treats a 2D array as a collection of ___________.

Answer 57

1D arrays

Question 58

A 2D array in Java has rows and columns, requiring ______ indices: One for the _______. One for the _______.

Answer 58

two row column

Question 59

Syntax for declaring a 2D array ________: Type of values the array can store (e.g., int, char).

Answer 59

DataType

Question 60

Syntax for declaring a 2D array ________: Reference variable for the 2D array object.

Answer 60

ArrayName

Question 61

Ways to Initialize a 2D Array ______________: Assign values directly during declaration.

Answer 61

Static Initialization

Question 62

Ways to Initialize a 2D Array ____________: Set the size first, then assign values later.

Answer 62

Dynamic Initialization

Question 63

Types of 2D Array Initialization 1. Double-Dimensional Array with Only Rows Initialized Specify the number of rows but leave columns __________.

Answer 63

uninitialized

Question 64

1. Double-Dimensional Array with Only Rows Initialized Creates a j_________(rows can have different column sizes). Useful for _________________ (e.g., storing words of different lengths).

Answer 64

jagged array flexible structures

Question 65

Types of 2D Array Initialization ___________________________: Not possible in Java. You must define rows first because a 2D array is an array of arrays. Columns are defined per row.

Answer 65

Double-Dimensional Array with Only Columns Initialized

Question 66

Types of 2D Array Initialization 1.__________________: Specify the number of rows but leave columns uninitialized. Creates a jagged array (rows can have different column sizes). Useful for flexible structures (e.g., storing words of different lengths). Initialize each row with a different number of columns

Answer 66

Double-Dimensional Array with Only Rows Initialized

Question 67

Types of 2D Array Initialization 3.______________________________: Declare a 2D array without initializing rows or columns. This is just a _________; no memory is allocated yet. Must initialize before use.

Answer 67

Double-Dimensional Array with No Rows or Columns Initialized reference

Question 68

A ________ is a 2D array where each row can have a different number of columns

Answer 68

jagged array

Question 69

A jagged array is a 2D array where each row can have a different number of ___________

Answer 69

columns

Question 70

Unlike regular 2D arrays, jagged arrays are not ____________. Useful when the data structure is __________ (e.g., varying number of subjects per student).

Answer 70

rectangular irregular

Question 71

Declaring and Initializing a Heterogeneous 2D Array A heterogeneous 2D array stores ___________ of __________.

Answer 71

elements different data types

Question 72

Declaring and Initializing a Heterogeneous 2D Array A ___________ stores elements of different data types.

Answer 72

heterogeneous 2D array

Question 73

Java arrays are _______ by ______all elements must be of the same type).

Answer 73

homogeneous default (

Question 74

To achieve __________, we use a workaround involving the Object class

Answer 74

heterogeneity

Question 75

To achieve heterogeneity, we use a workaround involving the _____

Answer 75

Object class

Question 76

To achieve heterogeneity, we use a ______ involving the Object class.

Answer 76

workaround

Question 77

How to Achieve Heterogeneity in Java Use the ________: The Object class is the root of Java’s class ________. By declaring a 2D array as Object[][], we can store _______ of any type.

Answer 77

Object class hierarchy elements

Question 78

Declaring and Initializing a Heterogeneous 2D Array Declare the array as _______ Assign ______ of different types

Answer 78

Object[][] values

Question 79

Accessing 2d Array Elements Since the array is of type Object, you must _________ elements back to their original types when _____ them

Answer 79

cast(typecasting) accessing

Question 80

Looping Through a 2D Array Use ________ (a loop inside another loop) to _______ all elements of a 2D array. ______: Iterates over the rows. __________: Iterates over the columns of each row.

Answer 80

nested loops traverse Outer loop nner loop

Question 81

Row-Major Order Traversal Iterates over ______ before moving to the next.

Answer 81

each row

Question 82

___________ Iterates over each row before moving to the next.

Answer 82

Row-Major Order Traversal

Question 83

__________ Iterates over each column before moving to the next.

Answer 83

Column-Major Order Traversal

Question 84

Column-Major Order Traversal Iterates over _____ before moving to the next.

Answer 84

each column

Question 85

A data structure is a way of ________ and ______ so that it can be accessed and modified efficiently.

Answer 85

organizing storing data

Question 86

A data structure is a way of organizing and storing data so that it can be_______ and ________ efficiently.

Answer 86

accessed modified

Question 87

Some common data structures include ___, linked lists, stacks, queues, hash tables, and trees.

Answer 87

arrays

Question 88

Arrays in Java are homogeneous(consisting of parts all of the same kind.) data structures implemented in Java as ______.

Answer 88

objects

Question 89

Arrays store one or more values of a ________ and provide _______ access to store the same.

Answer 89

specific data type indexed

Question 90

Arrays offer a _____ means of grouping related information.

Answer 90

convenient