10+ Sense Talent Labs Interview Questions and Answers

A circular linked list is a linked list where the last node points back to the first node, forming a loop.

• Create a Node class with data and next pointer

• Initialize the head and tail pointers to null

• When adding a node, if the list is empty, set head and tail to the new node

• If the list is not empty, set the next pointer of the tail to the new node and update the tail

• To traverse the circular linked list, start from the head and keep moving to the next node until you reach the hea...read more

To create a singleton class in a multi-threaded environment, we can use double-checked locking or synchronized block.

• Use double-checked locking to minimize the use of synchronization and improve performance.

• In double-checked locking, check if the instance is null, then synchronize the block and create the instance.

• Use volatile keyword to ensure visibility of the instance across threads.

• Alternatively, use synchronized block to create a thread-safe singleton class.

• In synchroniz...read more

The wait method in the Object class is used for inter-thread communication and synchronization.

• wait() is used to make a thread wait until another thread notifies it.

• It is used in multi-threaded applications to coordinate the execution of threads.

• wait() releases the lock held by the current thread, allowing other threads to acquire it.

• It is typically used in conjunction with notify() and notifyAll() methods.

• Example: wait() can be used to implement the producer-consumer pattern...read more

An immutable class in Java is a class whose state cannot be modified after it is created.

• Declare the class as final to prevent inheritance

• Declare all fields as private and final

• Do not provide any setter methods

• Ensure that any mutable objects within the class are not accessible or modifiable

• Provide only getter methods to access the fields

• If a field is mutable, return a copy of it instead of the original object

RDBMS is a relational database management system that uses structured data, while NoSQL is a non-relational database that uses unstructured data.

• RDBMS stores data in tables with predefined schemas, while NoSQL stores data in various formats like key-value, document, columnar, or graph.

• RDBMS supports ACID (Atomicity, Consistency, Isolation, Durability) properties, while NoSQL sacrifices some of these properties for scalability and performance.

• RDBMS is suitable for structured d...read more

No, generics are not limited to collections.

• Generics can be used with any type of class or interface, not just collections.

• They provide type safety and allow for code reusability.

• For example, generics can be used with classes like ArrayList, LinkedList, HashMap, etc.

• They can also be used with interfaces like Comparable, Iterator, etc.

HashMap is an unordered collection while LinkedHashMap maintains insertion order.

• HashMap uses hash table to store key-value pairs.

• LinkedHashMap uses doubly-linked list to maintain the insertion order.

• HashMap provides faster access and retrieval time complexity.

• LinkedHashMap provides predictable iteration order based on insertion order.

• Example: HashMap - {1=A, 2=B, 3=C}, LinkedHashMap - {1=A, 2=B, 3=C}

Normalization is the process of organizing data in a database to eliminate redundancy and improve data integrity.

• Normalization helps in reducing data redundancy by breaking down a database into multiple tables.

• It ensures that each table has a single purpose and avoids data duplication.

• Normalization follows a set of rules called normal forms, such as First Normal Form (1NF), Second Normal Form (2NF), etc.

• By eliminating redundancy, normalization improves data integrity and redu...read more

Performing asynchronous API calls for microservices involves using non-blocking operations to improve performance and scalability.

• Use asynchronous programming frameworks like Node.js or Spring WebFlux to handle concurrent API calls.

• Implement callback functions or promises to handle responses from asynchronous API calls.

• Consider using message queues like RabbitMQ or Kafka for communication between microservices.

• Use circuit breakers like Hystrix to handle failures and prevent c...read more

KPIs are Key Performance Indicators that measure the success of a business or project. They are quantifiable and help track progress.

• KPIs are specific metrics that are used to measure the success of a business or project

• They should be quantifiable and directly related to the goals of the business or project

• Examples of KPIs include revenue growth, customer satisfaction, and employee turnover rate

• KPIs should be regularly monitored and analyzed to track progress and make necessa...read more

Justification can be provided through data analysis and clear communication of benefits.

• Gather relevant data to support the decision

• Analyze the data to identify key benefits and potential drawbacks

• Communicate the benefits clearly to stakeholders

• Address any concerns or objections raised by stakeholders

• Provide a clear plan for implementation and ongoing evaluation

• Example: Justifying a new software system by demonstrating increased efficiency and cost savings

• Example: Justifying ...read more

Shrinkage and attrition are calculated by dividing the total number of lost hours by the total number of scheduled hours.

• Shrinkage refers to the time lost due to factors such as breaks, meetings, and training sessions.

• Attrition refers to the loss of employees due to resignation, retirement, or termination.

• To calculate shrinkage, divide the total number of lost hours by the total number of scheduled hours.

• To calculate attrition, divide the number of employees who left during a...read more

Securing API requests involves using authentication, encryption, and rate limiting to protect against unauthorized access and attacks.

• Use authentication mechanisms such as API keys, OAuth tokens, or JWT tokens to verify the identity of the requester.

• Implement encryption (e.g. HTTPS) to secure data transmission between the client and server.

• Utilize rate limiting to prevent abuse and protect against denial of service attacks.

• Regularly monitor and audit API requests for suspicio...read more

Rotate an array of strings by a given number of positions.

• Create a function that takes an array of strings and a number of positions to rotate.

• Use array slicing to rotate the array by shifting elements to the left or right.

• Handle cases where the number of positions is greater than the length of the array.

• Example: rotate_array(['a', 'b', 'c', 'd', 'e'], 2) => ['c', 'd', 'e', 'a', 'b']

Reverse an integer

• Convert the integer to a string

• Reverse the string

• Convert the reversed string back to an integer