Complexity Analysis and String Objects Quiz

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Questions and Answers

Which attribute is used as the only parameter in the concat constructor for the objects String, StringBuffer, and StringBuilder?

sBuf

size (correct)

SBuild

str

Where are the attributes String, StringBuffer, and StringBuilder initialized?

In constructors (correct)

In methods

In classes

In variables

What is the Java heap area and what does it store?

It is a dynamic memory area and stores objects instantiated by the JVM (correct)

It is a stack memory area and stores method calls

It is a static memory area and stores primitive types

It is a heap memory area and stores arrays

Which type of arrays does a linear search work for?

Both sorted and unsorted arrays Signup and view all the answers

What is the time complexity of a linear search?

$O(n)$ Signup and view all the answers

When an array is sorted, what type of search can we do?

Binary search Signup and view all the answers

Which of the following best describes the time complexity for accessing array elements?

$O(1)$ time Signup and view all the answers

What is the lower bound for array elements?

$0$ Signup and view all the answers

What is the length of a subarray $a[l:r]$, and how is it calculated?

$r-l+1$ Signup and view all the answers

What does it mean for an array to be sorted?

All elements are in ascending order Signup and view all the answers

Which attribute is used as the only parameter in the concat constructor for the objects String, StringBuffer, and StringBuilder?

size Signup and view all the answers

Where are the attributes String, StringBuffer, and StringBuilder initialized?

constructors Signup and view all the answers

What is an array?

A sequence of indexed elements Signup and view all the answers

What are the different types of arrays in Java?

Primitive and object arrays Signup and view all the answers

What is an array in Java?

An object Signup and view all the answers

Where does an array reside in Java?

Heap memory Signup and view all the answers

What is an example of a primitive array?

int[] primes = {2, 3, 5, 7, 11}; Signup and view all the answers

What does the index 'prime' point to in the given code snippet?

Data storage Signup and view all the answers

What attributes does the array 'primes' point to in the given code snippet?

Class tag, length, and stored values Signup and view all the answers

What is the syntax for creating an object array in Java?

datatype namespace = new datatype[#ofobjectstobeinstansiated]; Signup and view all the answers

Which of the following best describes the time complexity for accessing array elements?

$O(1)$ time Signup and view all the answers

What must you create if you need a different size array?

A new array Signup and view all the answers

What is the upper bound for array elements?

$n-1$ Signup and view all the answers

What do Java primitive arrays contain?

Elements that are values of primitive data types Signup and view all the answers

What can Java object arrays contain?

Objects of any class Signup and view all the answers

What is the relationship of an array in ascending order?

Elements are in ascending order Signup and view all the answers

What is the first step of inserting 35 at $ins:2$ of the array [10, 20, 30, 40, 50]?

Select $a[ins.right]$ Signup and view all the answers

What does it mean for an array to be sorted?

Elements are in ascending order Signup and view all the answers

What is selected in the expression $a[del+1.right]$ during array deletion?

Elements to the right of $del+1$ Signup and view all the answers

What is the goal of array deletions?

To remove a specific value from an array or subarray Signup and view all the answers

Which subarray is indicated by $a[del.right-1]$?

The subarray to the right of the site deletion Signup and view all the answers

What is done to the subarray $a[del.right-1]$?

The index of the subarray is decreased by one Signup and view all the answers

What happens to the elements of the subarray $a[del.right-1]$?

They are added back to the new array Signup and view all the answers

For which type of arrays does a linear search work?

Unsorted and sorted arrays Signup and view all the answers

What is the time complexity of a linear search?

$O(n)$ Signup and view all the answers

When an array is sorted, what type of search can we do?

Binary search Signup and view all the answers

What is a binary search used to find?

Target value from a subarray Signup and view all the answers

How is the subarray of a binary search represented?

$a[left:right]$ Signup and view all the answers

What is the equality of $a[left:right]$?

$left < right$ Signup and view all the answers

What is updated if the target is less than $a[m]$ in a binary search?

$r$ to $m-1$ Signup and view all the answers

Which sorting algorithm has the best-case time complexity of O(n) when the list is already sorted?

Bubble Sort Signup and view all the answers

What is the space complexity of Selection Sort?

O(1) Signup and view all the answers

Which sorting algorithm has the worst-case time complexity of O(n^2)?

Insertion Sort Signup and view all the answers

Which of the following is the average-case time complexity of the insertion sort algorithm?

O(n^2) Signup and view all the answers

What is the worst-case time complexity of the quick sort algorithm?

O(n^2) Signup and view all the answers

What is the space complexity of the quick sort algorithm on average?

O(log n) Signup and view all the answers

Study Notes

String, StringBuffer, and StringBuilder

The attribute used as the only parameter in the concat constructor for the objects String, StringBuffer, and StringBuilder is the string to be concatenated.
The attributes String, StringBuffer, and StringBuilder are initialized in the Java heap area.

Arrays

Java arrays are containers that store a fixed number of values of the same type.
Arrays can be of two types: primitive arrays and object arrays.
Primitive arrays contain primitive data types, whereas object arrays contain objects.
Arrays reside in the Java heap area.
Example of a primitive array: int[] primes = {2, 3, 5, 7};

Array Operations

Linear search works for arrays of any type.
The time complexity of a linear search is O(n).
When an array is sorted, a binary search can be used.
Binary search is used to find an element in a sorted array.
The subarray of a binary search is represented as a[left:right].
The equality of a[left:right] is right - left.

Array Indexing

The index of an array starts from 0.
The lower bound for array elements is 0.
The upper bound for array elements is the length of the array minus 1.
The length of a subarray a[l:r] is calculated as r - l.

Sorting and Searching

A sorted array is an array where the elements are arranged in ascending or descending order.
When an array is sorted, a binary search can be used.
Binary search is used to find an element in a sorted array.
The time complexity of a binary search is O(log n).

Sorting Algorithms

The best-case time complexity of Selection Sort is O(n) when the list is already sorted.
The space complexity of Selection Sort is O(1).
The worst-case time complexity of Selection Sort is O(n^2).
The average-case time complexity of Insertion Sort is O(n^2).
The worst-case time complexity of Quick Sort is O(n^2).
The average space complexity of Quick Sort is O(log n).

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Test your knowledge on Complexity Analysis and the different attributes and types of String, StringBuffer, and StringBuilder objects. Explore the importance of the size parameter in the concat constructor and understand where the attributes of these objects are initialized.

Complexity Analysis and String Objects Quiz

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Questions and Answers

Which attribute is used as the only parameter in the concat constructor for the objects String, StringBuffer, and StringBuilder?

Where are the attributes String, StringBuffer, and StringBuilder initialized?

What is the Java heap area and what does it store?

Which type of arrays does a linear search work for?

What is the time complexity of a linear search?

When an array is sorted, what type of search can we do?

Which of the following best describes the time complexity for accessing array elements?

What is the lower bound for array elements?

What is the length of a subarray $a[l:r]$, and how is it calculated?

What does it mean for an array to be sorted?

Which attribute is used as the only parameter in the concat constructor for the objects String, StringBuffer, and StringBuilder?

Where are the attributes String, StringBuffer, and StringBuilder initialized?

What is an array?

What are the different types of arrays in Java?

What is an array in Java?

Where does an array reside in Java?

What is an example of a primitive array?

What does the index 'prime' point to in the given code snippet?

What attributes does the array 'primes' point to in the given code snippet?

What is the syntax for creating an object array in Java?

Which of the following best describes the time complexity for accessing array elements?

What must you create if you need a different size array?

What is the upper bound for array elements?

What do Java primitive arrays contain?

What can Java object arrays contain?

What is the relationship of an array in ascending order?

What is the first step of inserting 35 at $ins:2$ of the array [10, 20, 30, 40, 50]?

What does it mean for an array to be sorted?

What is selected in the expression $a[del+1.right]$ during array deletion?

What is the goal of array deletions?

Which subarray is indicated by $a[del.right-1]$?

What is done to the subarray $a[del.right-1]$?

What happens to the elements of the subarray $a[del.right-1]$?

For which type of arrays does a linear search work?

What is the time complexity of a linear search?

When an array is sorted, what type of search can we do?

What is a binary search used to find?

How is the subarray of a binary search represented?

What is the equality of $a[left:right]$?

What is updated if the target is less than $a[m]$ in a binary search?

Which sorting algorithm has the best-case time complexity of O(n) when the list is already sorted?

What is the space complexity of Selection Sort?

Which sorting algorithm has the worst-case time complexity of O(n^2)?

Which of the following is the average-case time complexity of the insertion sort algorithm?

What is the worst-case time complexity of the quick sort algorithm?

What is the space complexity of the quick sort algorithm on average?

Study Notes

String, StringBuffer, and StringBuilder

Arrays

Array Operations

Array Indexing

Sorting and Searching

Sorting Algorithms

Studying That Suits You

Description

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