Melody Healthcare Interview Questions and Answers

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.

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 ne...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 occu...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: ExecutorSer...read more

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, allowin...read more

HPLC stands for High Performance Liquid Chromatography. It is a technique used to separate, identify, and quantify components in a mixture.

• HPLC is based on the principle of separating components in a mixture using a liquid mobile phase and a solid stationary phase.

• It is commonly used in pharmaceutical, environmental, and food industries for analyzing compounds.

• HPLC instruments consist of a pump, injector, column, detec...read more