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Numerical, logical reasoning
Java is a high-level programming language known for its portability, security, and object-oriented features.
Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)
It is known for its strong security features, such as automatic memory management and built-in exception handling
Java is object-oriented, allowing for the creation of reusable code through classes and objects
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JDBC steps for establishing a connection with a database
Load the JDBC driver class using Class.forName() method
Create a connection object using DriverManager.getConnection() method
Create a statement object using connection.createStatement() method
Execute SQL queries using statement.executeQuery() or statement.executeUpdate() methods
Close the connection using connection.close() method
Hashing in Java is a technique used to convert a key into an index in a hash table, allowing for efficient data retrieval.
Hashing is used to quickly retrieve data from a large dataset by converting keys into indexes in a hash table.
It involves applying a hash function to the key to generate a unique hash code.
Java provides built-in hash functions for common data types like strings and integers.
Example: HashMap and Hash...
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I applied via Naukri.com and was interviewed before Jul 2020. There was 1 interview round.
Name mangling is a technique used by compilers to give unique names to functions and variables to avoid naming conflicts.
Name mangling is used in C++ to support function overloading.
It is also used in Python to avoid naming conflicts in modules.
Name mangling can make it difficult to access variables and functions from outside the class in which they are defined.
In C++, name mangling can be seen by using the 'nm' comman
I applied via Naukri.com and was interviewed in Aug 2020. There were 3 interview rounds.
Abstract Factory is a creational design pattern that provides an interface for creating families of related objects.
Abstract Factory is used when we need to create families of related objects without specifying their concrete classes.
It provides an interface for creating objects of related classes without specifying their concrete classes.
It encapsulates a group of factories that have a common theme.
It promotes loose c...
Range based map iteration can be done using a for-each loop or iterators.
Use a for-each loop to iterate over the map elements.
Alternatively, use iterators to traverse the map.
The range-based for loop is preferred for its simplicity and readability.
Example: for(auto const& [key, value] : myMap) { //do something with key and value }
Detached threads are independent threads that run separately from the main thread. Joined threads are threads that wait for the main thread to finish.
Detached threads are created using pthread_detach() function
Joined threads are created using pthread_join() function
Detached threads do not need to be explicitly terminated
Joined threads must be explicitly terminated using pthread_exit() or return statement
Detached thread...
Static code analysis tools are software programs that analyze source code to find potential issues and improve code quality.
Static code analysis tools scan code without executing it
They can detect issues such as security vulnerabilities, coding errors, and performance problems
Examples of static code analysis tools include SonarQube, ESLint, and Checkstyle
Command to list currently running threads in linux
Use the 'ps' command with the 'H' option to display threads in a hierarchy
Use the 'top' command to display threads in real-time
Use the 'htop' command for an interactive display of threads
No, arithmetic operations cannot be performed on unique pointers.
Unique pointers are used to manage the lifetime of dynamically allocated objects.
They cannot be copied or assigned, only moved.
Arithmetic operations are not defined for pointers, including unique pointers.
Designing Facebook is a complex task involving various components and technologies.
Identify the core features of Facebook such as user profiles, news feed, messaging, and groups.
Choose appropriate technologies for each component such as PHP for backend, React for frontend, and MySQL for database.
Ensure scalability and performance by implementing caching, load balancing, and database sharding.
Implement security measures...
I applied via Job Fair and was interviewed before May 2021. There were 2 interview rounds.
I applied via Referral and was interviewed in Jan 2020. There were 4 interview rounds.
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