Arrays, Arraylists

Question 1

a set of well-
defined instructions to solve a
particular problem. It takes a
set of input(s) and produces the
desired output.

Answer 1

Algorithm

Question 2

a storage that is
used to store and organize data.

Answer 2

Data Structure

Question 3

the elements are arranged in sequence
one after the other. Since elements
are arranged in particular order,
they are easy to implement.

Answer 3

Linear Data Structure

Question 4

are arranged in a
hierarchical manner where one
element will be connected to one or
more elements.

Answer 4

Non-Linear Data Structure

Question 5

Fixed-size sequential collection of elements of the same kind.

Answer 5

Arrays

Question 6

To find out how many elements an array has,

Answer 6

length

Question 7

an array of arrays.

Answer 7

Multidimensional Arrays

Question 8

Most basic type of Multidimensional Array and is also called the matrix

Answer 8

2d array

Question 9

the Java Collection Framework. This class
provides static methods to
dynamically create and access
Java arrays.

Answer 9

Array Class

Question 10

a part of the
Java collection framework and it
is a class of java.util package.
It provides us with dynamic
arrays in Java.

Answer 10

ArrayList

Question 11

ArrayList in Java can be seen as a vector in

Answer 11

C++

Question 12

Array List Advantages

Answer 12

1. Dynamic size
2. Easy to use
3. Fast Access
4. Ordered Collections
5. Support Null Values

Question 13

Array List Disadvantages

Answer 13

1. Slower than arrays
2. Increased Memory Usage
3. Not Thread Safe
4. Performance Degradation

Question 14

ArrayLists Methods

Answer 14

add();
remove();
size();
get();
clear();
set();

Question 15

Array Methods

Answer 15

toString();
binarySearch();
compare();
sort();

Question 16

ArrayList can not be used for primitive types, like int,
char, etc. We need a ________ class for such cases.

Answer 16

Wrapper

Question 17

Which package contains the Scanner class

Answer 17

java.util packgae

Question 18

Operator used to concatenate two strings in java

Answer 18

+

Question 19

Used to test two strings for equality

Answer 19

equals()

Question 20

Every IF statement in java does not need to be followed by an ELSE OR ELSE IF statement

Answer 20

TRUE

Question 21

Accesses a specific element in an array

Answer 21

INDEX

Question 22

Syntax for creating an Array

Answer 22

data_type[] name_of_array = new data_type[size of array];