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RecyclerView is a flexible view for providing a limited window into a large data set.
RecyclerView is used to display large data sets that can be scrolled efficiently.
It reuses the views that are no longer visible to display new data.
It uses a LayoutManager to position the items and a ViewHolder to cache the views.
It provides built-in animations for adding, removing, and updating items.
It supports both vertical and hori...
Array is a collection of elements of similar data type stored in contiguous memory locations. LinkedList is a data structure where each element is a separate object with a reference to the next element.
Array has fixed size, LinkedList can grow dynamically
Array has faster access time, LinkedList has faster insertion and deletion time
Array is best for random access, LinkedList is best for sequential access
Example of Arra...
Context is an object that provides access to application-specific resources and classes.
Context is used to get access to system services, resources, preferences, etc.
There are two types of context: Application Context and Activity Context.
Application Context is tied to the lifecycle of the application and is available throughout the application.
Activity Context is tied to the lifecycle of an activity and is available o...
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posted on 7 Sep 2015
I applied via Referral
I was interviewed before Mar 2021.
Round duration - 60 Minutes
Round difficulty - Easy
Given a binary tree of integers, return the level order traversal of the binary tree.
The first line contains an integer 'T', representing the number of te...
Return the level order traversal of a binary tree given in level order with null nodes represented by -1.
Create a queue to store nodes for level order traversal
Start with the root node and add it to the queue
While the queue is not empty, dequeue a node, print its value, and enqueue its children
Repeat until all nodes are traversed in level order
Round duration - 45 minutes
Round difficulty - Easy
A deadlock in DBMS occurs when two or more transactions are waiting for each other to release locks, causing them to be stuck indefinitely.
Deadlock is a situation where two or more transactions are unable to proceed because each is waiting for the other to release locks.
To prevent deadlocks, DBMS uses techniques like deadlock detection and prevention algorithms.
Joins in DBMS are used to combine rows from two or more ta...
Round duration - 60 Minutes
Round difficulty - Medium
Design a system for Twitter
Key components: user profiles, tweets, hashtags, timelines
Architecture: microservices, load balancers, databases, caching
Scalability: sharding, replication, CDN
Real-time processing: streaming APIs, push notifications
Round duration - 60 Minutes
Round difficulty - Medium
You are provided with an array of ‘N’ integers and ‘Q’ queries. Each query requires calculating the maximum subarray sum in a specified range of the array.
The first ...
Implement a function to calculate maximum subarray sum queries in a given range of an array.
Iterate through each query and calculate the maximum subarray sum within the specified range using Kadane's algorithm.
Keep track of the maximum sum found so far and update it as needed.
Return the maximum subarray sum for each query in the test case.
Given an integer array arr
of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
The first line contains an integer 'T' representing the n...
Sort an integer array containing only 0s, 1s, and 2s in linear time complexity.
Use a single scan over the array to sort it in-place.
Maintain three pointers for 0s, 1s, and 2s and swap elements accordingly.
Example: Input: [0, 2, 1, 2, 0], Output: [0, 0, 1, 2, 2]
Round duration - 20 Minutes
Round difficulty - Medium
Tip 1 : Prepare DS and Algo
Tip 2 : Prepare Dynamic programming
Tip 1 : Good in DS and algo that will be help in the interview that is very neccassry
Tip 2 : Prepare DBMS
posted on 24 Apr 2024
I applied via Campus Placement and was interviewed in Oct 2023. There were 3 interview rounds.
It was online 60min test.
It was offline 30 min test.
posted on 26 Apr 2024
I applied via Campus Placement and was interviewed before Apr 2023. There was 1 interview round.
The 4 principles of OOP are Inheritance, Encapsulation, Abstraction, and Polymorphism.
Inheritance allows a class to inherit properties and behavior from another class.
Encapsulation restricts access to certain components within a class, protecting the data.
Abstraction hides complex implementation details and only shows the necessary features.
Polymorphism allows objects to be treated as instances of their parent class.
String buffer is synchronized and thread-safe, while string builder is not synchronized and faster.
String buffer is synchronized, making it thread-safe for use in multi-threaded environments.
String builder is not synchronized, providing better performance in single-threaded applications.
String builder is faster than string buffer due to lack of synchronization overhead.
Example: StringBuffer sb = new StringBuffer(); Str
Strings are immutable in order to ensure data integrity and security.
Immutable strings prevent accidental data modification, ensuring data integrity.
Immutable strings enhance security by preventing unauthorized access or tampering.
Immutable strings allow for more efficient memory management and optimization.
Example: 'Hello' cannot be changed to 'Hella' directly, a new string must be created.
There are two types of exceptions in Java: checked exceptions and unchecked exceptions.
Checked exceptions are checked at compile time and must be handled using try-catch or throws keyword.
Unchecked exceptions are not checked at compile time and include RuntimeException and its subclasses.
Examples of checked exceptions include IOException, SQLException, and ClassNotFoundException.
Examples of unchecked exceptions include...
Linear search is a simple searching algorithm that sequentially checks each element in a list until a match is found.
Iterate through each element in the list
Compare the current element with the target value
Return the index if a match is found, otherwise return -1
JDK includes JRE and development tools, while JRE includes only the Java Runtime Environment.
JDK stands for Java Development Kit, which includes JRE and development tools like compilers and debuggers.
JRE stands for Java Runtime Environment, which includes JVM and libraries necessary to run Java applications.
JVM stands for Java Virtual Machine, which is responsible for executing Java bytecode.
JDK is used for developing ...
posted on 12 Apr 2023
I applied via Recruitment Consulltant and was interviewed before Apr 2022. There were 3 interview rounds.
25 MCQ questions online with time limit
Create webapp . Frontend, Backend , data encryption
posted on 4 Nov 2023
I was interviewed in Oct 2023.
Easy to medium
profit and loss questions
Permutation and combination
Easy to medium
45 mins
Operator overloading allows operators to be redefined for user-defined types in Java.
Operator overloading is not supported in Java as it can lead to ambiguity and confusion.
Java does not allow custom operators to be defined or existing operators to be overloaded.
Instead of operator overloading, Java provides method overloading where methods with the same name but different parameters can be defined.
Java is a high-level, object-oriented programming language known for its platform independence and robust features.
Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)
It is object-oriented, allowing for modular and reusable code
Java is known for its robust standard library, which includes tools for networking, I/O, and more
It supports multithreading, allowing for concurrent e...
posted on 24 Sep 2024
I applied via Campus Placement
Easy aptitude, 30 min with 20 question
based on 1 interview
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