Geodis Overseas Software Engineer Interview Questions and Answers

Checked and unchecked exceptions are used in Java to handle errors. Checked exceptions must be handled, while unchecked exceptions do not.

• 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 do not require handling

• Example of checked exception: IOException

• Example of unchecked exception: NullPointerException

Yes, I have used multithreading in software development.

• Multithreading is the ability of a central processing unit (CPU) to execute multiple threads concurrently.

• It allows for parallel execution of tasks, improving performance and responsiveness in applications.

• Multithreading can be used to perform tasks in the background while the main thread handles user interactions.

• Examples of multithreading in software development...read more

LINQ joins on 2 tables allow for combining data from both tables based on a common key.

• Use the 'join' keyword in LINQ to join two tables based on a common key

• Specify the key to join on using 'equals' keyword

• Select the desired columns from both tables in the result

Open close principle states that a class should be open for extension but closed for modification.

• Classes should be open for extension through inheritance or implementing interfaces

• Classes should be closed for modification to avoid breaking existing code

• Example: Using abstract classes or interfaces to define behavior and allowing subclasses to implement specific functionality

Identifying and solving race conditions involves understanding concurrent execution and implementing synchronization mechanisms.

• Understand the critical sections of code where race conditions can occur

• Use synchronization mechanisms like locks, semaphores, or atomic operations to control access to shared resources

• Implement thread-safe data structures or use thread-safe libraries to avoid race conditions

• Use tools like sta...read more

Find the third largest element in an unsorted array of strings.

• Sort the array in descending order.

• Remove duplicates if necessary.

• Return the element at index 2 as the third largest.