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Mintoak Innovations Java Developer Interview Questions, Process, and Tips
Top Mintoak Innovations Java Developer Interview Questions and Answers
- Q1. How to sort a class object having roll no names add to roll no
- Q2. Spring Boot Annotations, how they work with each other
- Q3. Differences in diff SQL DBs - postgresql vs oracle sql
Mintoak Innovations Java Developer Interview Experiences
2 interviews found
Anonymous
(4 Questions)
- Q1. What is hashmap in java
- Ans.
HashMap in Java is a data structure that stores key-value pairs and allows fast retrieval of values based on keys.
HashMap is part of the Java Collections framework.
It uses hashing to store key-value pairs, allowing for fast retrieval.
Keys in a HashMap must be unique, but values can be duplicated.
Example: HashMap<String, Integer> map = new HashMap<>(); map.put("John", 25);
- Q2. What is constructor
- Ans.
A constructor in Java is a special type of method that is used to initialize objects. It has the same name as the class and no return type.
Constructors are called when an object of a class is created.
They can be used to initialize instance variables or perform any other setup required for the object.
Constructors can be overloaded, meaning a class can have multiple constructors with different parameters.
If a class does ...
- Q3. How to sort a class object having roll no names add to roll no
- Ans.
You can sort a class object by implementing the Comparable interface and overriding the compareTo method.
Implement the Comparable interface in the class and override the compareTo method to compare objects based on roll number.
Use Collections.sort() method to sort the list of objects based on roll number.
Example: class Student implements Comparable<Student> { public int compareTo(Student s) { return this.rollNo -
- Q4. What is comparator
- Ans.
A Comparator in Java is an interface used to compare objects for sorting purposes.
Comparator interface is used to define custom comparison logic for objects.
It has a method called compare() which takes two objects as arguments and returns an integer value based on their comparison.
It is commonly used with sorting algorithms like Collections.sort() or Arrays.sort().
Interview Preparation Tips
Skills evaluated in this interview
I applied via Recruitment Consulltant and was interviewed in Sep 2024. There was 1 interview round.
(4 Questions)
- Q1. Functional Interfaces in Java
- Ans.
Functional interfaces in Java are interfaces with a single abstract method, used for lambda expressions and method references.
Functional interfaces have only one abstract method, but can have multiple default or static methods.
Examples include java.lang.Runnable, java.util.Comparator, and java.util.function.Predicate.
Functional interfaces can be used with lambda expressions and method references for concise code.
- Q2. Spring Boot Annotations, how they work with each other
- Ans.
Spring Boot annotations are used to simplify the development process by providing metadata to the Spring framework.
Annotations like @RestController, @RequestMapping, and @Autowired are commonly used in Spring Boot to define controllers, request mappings, and dependency injection.
Annotations like @SpringBootApplication are used to bootstrap the Spring application context.
Annotations like @ComponentScan and @EnableAutoCo...
- Q3. Streams in Java
- Ans.
Streams in Java are sequences of elements that support functional-style operations.
Streams are used to process collections of objects in a functional way.
They allow for concise and readable code by enabling operations like filter, map, reduce, etc.
Example: List
names = Arrays.asList("Alice", "Bob", "Charlie"); Stream stream = names.stream();
- Q4. Differences in diff SQL DBs - postgresql vs oracle sql
- Ans.
PostgreSQL and Oracle SQL differ in terms of licensing, features, performance, and cost.
PostgreSQL is open-source while Oracle SQL is proprietary.
PostgreSQL is known for its extensibility and support for advanced features like JSON data types, while Oracle SQL is known for its robustness and scalability.
PostgreSQL is generally considered more cost-effective for small to medium-sized projects, while Oracle SQL is prefer...
Skills evaluated in this interview
Interview questions from similar companies
I appeared for an interview before Apr 2021.
(3 Questions)
Round duration - 90 minutes
Round difficulty - Medium
This round had 3 coding questions of Medium to Hard level of difficulty.
- Q1.
Balanced Parentheses Combinations
Given an integer
Nrepresenting the number of pairs of parentheses, find all the possible combinations of balanced parentheses using the given number of pairs.Explanati...
- Ans.
Generate all possible combinations of balanced parentheses for a given number of pairs.
Use recursion to generate all possible combinations of balanced parentheses.
Keep track of the number of open and close parentheses used in each combination.
Return the valid combinations as an array of strings.
- Q2.
Trapping Rain Water Problem Statement
You are given a long type array/list
ARRof sizeN, representing an elevation map. The valueARR[i]denotes the elevation of theithbar. Your task is to determine th... - Ans.
Calculate the total amount of rainwater that can be trapped between given elevations in an array.
Iterate through the array and calculate the maximum height on the left and right of each bar.
Calculate the amount of water that can be trapped at each bar by taking the minimum of the maximum heights on the left and right.
Sum up the trapped water at each bar to get the total trapped water for the entire array.
- Q3.
Rotting Oranges Problem Statement
You are given a grid containing oranges where each cell of the grid can contain one of the three integer values:
- 0 - representing an empty cell
- 1 - representing a fre...
- Ans.
Find the minimum time required to rot all fresh oranges adjacent to rotten oranges.
Create a queue to store the coordinates of rotten oranges and perform BFS to rot adjacent fresh oranges.
Track the time taken to rot all fresh oranges and return -1 if not all fresh oranges can be rotten.
Update the grid with the new state of oranges after each second.
Handle edge cases such as empty grid or no fresh oranges present.
Example...
(3 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
This was a standard DS/Algo round where I was given 2 questions to solve under 60 minutes. I was able to come up with the optimal approach for both the questions and then at the end of the interview I was also asked the famous Die Hard Water Puzzle.
- Q1.
Queue Using Stacks Implementation
Design a queue data structure following the FIFO (First In First Out) principle using only stack instances.
Explanation:
Your task is to complete predefined functions t...
- Ans.
Implement a queue using stacks following FIFO principle.
Use two stacks to simulate a queue.
For enQueue operation, push elements onto stack1.
For deQueue operation, if stack2 is empty, pop all elements from stack1 and push onto stack2, then pop from stack2.
For peek operation, if stack2 is empty, pop all elements from stack1 and push onto stack2, then return top of stack2.
For isEmpty operation, check if both stack1 and st...
- Q2.
Merge Intervals Problem Statement
You are provided with 'N' intervals, each containing two integers denoting the start time and end time of the interval.
Your task is to merge all overlapping intervals a...
- Ans.
Merge overlapping intervals and return sorted list of merged intervals by start time.
Sort the intervals based on start time.
Iterate through intervals and merge overlapping ones.
Return the merged intervals in sorted order.
- Q3. You have a 3-liter jar and a 5-liter jar. How can you measure exactly 4 liters using these two jars?
(4 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
This round had 2 coding questions - first one related to Binary Tree and the second one was a simple question from Bit Manipulation. This was followed by some questions from OOPS.
- Q1.
Binary Tree Diameter Problem Statement
You are given a Binary Tree, and you need to determine the length of the diameter of the tree.
The diameter of a binary tree is the length of the longest path betwe...
- Ans.
The task is to find the diameter of a binary tree, which is the length of the longest path between any two end nodes in the tree.
Traverse the tree to find the longest path between two nodes.
Keep track of the maximum diameter found during traversal.
The diameter may not necessarily pass through the root node.
Consider both left and right subtrees while calculating the diameter.
Example: For input 1 2 3 4 -1 5 6 -1 7 -1 -1
- Q2.
Power of 2 Problem Statement
Determine if it is possible to reorder the digits of a given integer 'N' such that the resulting number is a power of two. The leading digit must not be zero.
Input:
The fir... - Ans.
The problem involves determining if it is possible to reorder the digits of a given integer to form a power of 2.
Iterate through all possible permutations of the digits of the given integer.
Check if any of the permutations form a power of 2.
Return 1 if a valid permutation is found, else return 0.
- Q3. What are some advantages of using Object-Oriented Programming (OOP)?
- Ans.
Advantages of OOP include code reusability, modularity, and easier maintenance.
Code reusability: Objects can be reused in different parts of the program, reducing redundancy.
Modularity: OOP allows for breaking down complex problems into smaller, more manageable parts.
Easier maintenance: Changes to one part of the codebase do not necessarily affect other parts, making maintenance easier.
Encapsulation: Data hiding and ab...
- Q4. What are access specifiers and what is their significance in Object-Oriented Programming?
- Ans.
Access specifiers define the level of access to class members in Object-Oriented Programming.
Access specifiers include public, private, protected, and default
Public members are accessible from outside the class
Private members are only accessible within the class
Protected members are accessible within the class and its subclasses
Default access is when no access specifier is specified
(1 Question)
Round duration - 30 Minutes
Round difficulty - Easy
This was my last round and I hoped it to go good just like the other rounds. The interviewer was very straight to point
and professional. The interview lasted for 30 minutes.
- Q1. Why should we hire you?
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
Interview Questionnaire
8 Questions
- Q1. Implement queue with the help of two stacks
- Ans.
Queue can be implemented using two stacks by maintaining the order of elements in the stacks.
Create two stacks, let's call them stack1 and stack2
When an element is enqueued, push it to stack1
When an element is dequeued, pop all elements from stack1 and push them to stack2
Pop the top element from stack2 and return it as the dequeued element
If stack2 is empty, repeat step 3
To get the front element of the queue, peek the
- Q2. Iven a table “student” of with columns Name and Marks. You have to write a SQL query to get the 2nd highest marks from the table. Also write a query to find the nth highest marks, where n can be any number
- Q3. What is left join. Give example. And Full outer join?
- Ans.
Left join returns all records from left table and matching records from right table. Full outer join returns all records from both tables.
Left join is used to combine two tables based on a common column.
In left join, all records from the left table are returned along with matching records from the right table.
If there is no match in the right table, NULL values are returned.
Example: SELECT * FROM table1 LEFT JOIN table...
- Q4. What is magic functions and autoloading in PHP?
- Ans.
Magic functions are special methods in PHP that start with __. Autoloading is a way to automatically load classes.
Magic functions are used to handle certain events in PHP, such as object creation or property access.
Autoloading allows PHP to automatically load classes when they are needed, without requiring manual includes.
Magic functions can be used in conjunction with autoloading to dynamically load classes or handle
- Q5. Given three arrays sorted in non-decreasing order, print all common elements in these arrays. Examples: ar1[] = {1, 5, 10, 20, 40, 80} ar2[] = {6, 7, 20, 80, 100} ar3[] = {3, 4, 15, 20, 30, 70, 80, 120} Ou...
- Ans.
Given three sorted arrays, find common elements.
Create three pointers to traverse each array
Compare the elements at the pointers and move the pointer of the smallest element
If all pointers point to the same element, add it to the result and move all pointers
Repeat until any pointer reaches the end of its array
- Q6. A puzzle. You will be given with a 3 Litre container & a 7 Litre Container. Measure exactly 5 Litres of water
- Q7. Asked about one of my projects I mentioned in my resume?
- Q8. Find if a number is a power of 2 or not?
- Ans.
Check if a number is a power of 2 or not.
A power of 2 has only one bit set in its binary representation.
Use bitwise AND operator to check if the number is a power of 2.
If n is a power of 2, then n & (n-1) will be 0.
Interview Preparation Tips
College Name: na
Motivation: Overall it was a very good experience. They test you from every aspect. In the End I would like to say that Practo is one of the best companies to work for.
Skills evaluated in this interview
Interview Questionnaire
9 Questions
- Q1. What is event bubbling?
- Ans.
Event bubbling is the propagation of an event from the innermost child element to the outermost parent element.
Events triggered on a child element will also trigger on its parent elements
The event travels up the DOM tree until it reaches the document object
Can be stopped using event.stopPropagation()
Can be useful for event delegation
- Q2. Difference between .on(‘click’,function() and .click(function())
- Ans.
The .on('click',function() is a more flexible method than .click(function())
The .on() method can handle multiple events and selectors
The .click() method can only handle one event and one selector
The .on() method can also handle dynamically added elements
The .click() method cannot handle dynamically added elements
- Q3. Write a function to check if two strings are anagram or not
- Ans.
Function to check if two strings are anagram or not
Create two character arrays from the strings
Sort the arrays
Compare the sorted arrays
- Q4. Given an array of integers which can be in one of four order – i.Increasing 2.Decreasing 3.decreasing then increasing 4.increasing then decreasing .Write a function to find the type of array
- Ans.
Function to determine the order of integers in an array.
Check first and last element to determine if increasing or decreasing
Check for inflection point to determine if order changes
Return order type as string
- Q5. How can you improve the performance of a site.(Only frontend)
- Ans.
Optimize images, minify code, reduce HTTP requests, use caching, and lazy loading.
Optimize images using compression and appropriate file formats
Minify code to reduce file size and improve load times
Reduce HTTP requests by combining files and using sprites
Use caching to store frequently accessed data locally
Implement lazy loading to defer loading of non-critical resources
- Q6. Design database schema for a movie site.Where user can watch the movie,genre of movie,give ratings and recommended movies to user.Also Write an algorithm to show recommended movies to user
- Ans.
Design a database schema for a movie site with user ratings and recommendations.
Create tables for movies, users, ratings, and recommendations
Use foreign keys to link tables
Include columns for movie genre and user watch history
Algorithm for recommendations can use user watch history and ratings to suggest similar movies
- Q7. By tossing a coin we can get either head or tail, i have a function toss() which return head or tail with equal probability
- Q8. You have to write a function for dice which will return number from 1-6 with equal probability. constraints : you can not use random function, you can use only toss function
- Ans.
Function to simulate dice roll with equal probability without using random function
Use a toss function that returns either 0 or 1 with equal probability
Call the toss function 3 times and convert the result to a binary number
If the binary number is greater than 0 and less than or equal to 6, return it
If the binary number is greater than 6, repeat the process
- Q9. Write a query to fetch duplicate email from table?
- Ans.
Query to fetch duplicate email from table
Use GROUP BY and HAVING clause to filter out duplicates
SELECT email, COUNT(*) FROM table_name GROUP BY email HAVING COUNT(*) > 1;
This will return all the duplicate emails in the table
Interview Preparation Tips
College Name: na
Motivation: Practo is the market leader in digital healthcare management with millions of consumers using our products to find doctors, book appointments and manage their healthcare efficiently. Practo Ray is the platform of choice for the vast majority of doctors and clinics deploying cloud based clinic management solution.I recently got an offer from Practo, here is my interview experience:
Skills evaluated in this interview
I applied via Recruitment Consultant and was interviewed before May 2020. There were 3 interview rounds.
Interview Questionnaire
2 Questions
- Q1. DS and Algo questions based on DP and backtracking
- Q2. Clone linked list with random pointers.
- Ans.
Clone a linked list with random pointers.
Create a new node for each node in the original list.
Store the mapping between the original and cloned nodes in a hash table.
Traverse the original list again and set the random pointers in the cloned list using the hash table.
Return the head of the cloned list.
Interview Preparation Tips
Skills evaluated in this interview
I applied via Walk-in and was interviewed before Jul 2020. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. Egerly they asked questions about your inner confidence of tha job seekers
Interview Preparation Tips
(1 Question)
- Q1. Difference between absolute xpath and relative xpath
- Ans.
Absolute xpath specifies the complete path from the root element to the desired element, while relative xpath specifies the path relative to the current element.
Absolute xpath starts with a single forward slash (/) and is more specific.
Relative xpath starts with a double forward slash (//) and is more flexible.
Absolute xpath is more prone to breaking if the structure of the page changes.
Relative xpath is easier to main...
Skills evaluated in this interview
Data Structures and Algorithms
(2 Questions)
- Q1. Data Structures
- Q2. System design questions
I applied via Company Website and was interviewed in Apr 2022. There were 2 interview rounds.
Mcq
Interview Preparation Tips
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- C++
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