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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?
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?
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?
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?
Which type of arrays does a linear search work for?
What is the time complexity of a linear search?
What is the time complexity of a linear search?
When an array is sorted, what type of search can we do?
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?
Which of the following best describes the time complexity for accessing array elements?
What is the lower bound for 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 is the length of a subarray $a[l:r]$, and how is it calculated?
What does it mean for an array to be sorted?
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?
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?
Where are the attributes String, StringBuffer, and StringBuilder initialized?
What is an array?
What is an array?
What are the different types of arrays in Java?
What are the different types of arrays in Java?
What is an array in Java?
What is an array in Java?
Where does an array reside in Java?
Where does an array reside in Java?
What is an example of a primitive array?
What is an example of a primitive array?
What does the index 'prime' point to in the given code snippet?
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 attributes does the array 'primes' point to in the given code snippet?
What is the syntax for creating an object array in Java?
What is the syntax for creating an object array in Java?
Which of the following best describes the time complexity for accessing array elements?
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 must you create if you need a different size array?
What is the upper bound for array elements?
What is the upper bound for array elements?
What do Java primitive arrays contain?
What do Java primitive arrays contain?
What can Java object arrays contain?
What can Java object arrays contain?
What is the relationship of an array in ascending order?
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 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 does it mean for an array to be sorted?
What is selected in the expression $a[del+1.right]$ during array deletion?
What is selected in the expression $a[del+1.right]$ during array deletion?
What is the goal of array deletions?
What is the goal of array deletions?
Which subarray is indicated by $a[del.right-1]$?
Which subarray is indicated by $a[del.right-1]$?
What is done to the subarray $a[del.right-1]$?
What is done to the subarray $a[del.right-1]$?
What happens to the elements of the subarray $a[del.right-1]$?
What happens to the elements of the subarray $a[del.right-1]$?
For which type of arrays does a linear search work?
For which type of arrays does a linear search work?
What is the time complexity of a linear search?
What is the time complexity of a linear search?
When an array is sorted, what type of search can we do?
When an array is sorted, what type of search can we do?
What is a binary search used to find?
What is a binary search used to find?
How is the subarray of a binary search represented?
How is the subarray of a binary search represented?
What is the equality of $a[left:right]$?
What is the equality of $a[left:right]$?
What is updated if the target is less than $a[m]$ in a binary search?
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?
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?
What is the space complexity of Selection Sort?
Which sorting algorithm has the worst-case time complexity of O(n^2)?
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?
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 worst-case time complexity of the quick sort algorithm?
What is the space complexity of the quick sort algorithm on average?
What is the space complexity of the quick sort algorithm on average?
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]isright - 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 asr - 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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Description
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.
