Tescra Interview Questions and Answers

HashMap is not thread-safe while ConcurrentHashMap is thread-safe. ConcurrentHashMap is preferred for concurrent operations.

• HashMap is not thread-safe and can lead to ConcurrentModificationException in a multi-threaded environment.

• ConcurrentHashMap allows concurrent read and write operations without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concur...read more

Multithreading is the ability of a CPU to execute multiple threads concurrently. Callable interface is similar to Runnable interface but can return a result and throw a checked exception.

• Multithreading allows multiple threads to run concurrently, improving performance and responsiveness.

• Callable interface in Java is similar to Runnable interface but can return a result and throw a checked exception.

• Example: ExecutorService.submit(Callable) method returns a Future object repre...read more

Encapsulation, polymorphism, and inheritance are key concepts in Java OOP.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class). Access to the data is restricted to methods within the class.

• Polymorphism: Ability of a single method to perform different actions based on the object it is acting upon. Achieved through method overloading and overriding.

• Inheritance: Mechanism where a new class inherits properties and behaviors from an existing...read more

Exceptions - try with resources is a Java feature that automatically closes resources after they are no longer needed.

• Try with resources is a Java feature introduced in Java 7 to automatically close resources like streams, connections, etc. after they are no longer needed.

• It simplifies the code by reducing the need for explicit resource management and ensures that resources are closed properly even if an exception occurs.

• The syntax involves declaring the resource within the t...read more

Preparing a Dr. wise agenda before field work helps in better time management and prioritization of tasks.

• Helps in identifying the most important doctors to visit first

• Allows for better planning of travel routes

• Ensures that all necessary materials and samples are prepared beforehand

• Helps in setting realistic targets for the day

• Improves overall efficiency and productivity

OOPS stands for Object-Oriented Programming System. It is a programming paradigm based on the concept of objects.

• OOPS focuses on creating objects that contain data in the form of fields (attributes) and code in the form of procedures (methods).

• Encapsulation, inheritance, and polymorphism are key principles of OOPS.

• Examples of OOPS languages include Java, C++, and Python.