IQVIA Interview Questions and Answers

Java is a high-level, object-oriented programming language used for developing applications.

• Java features include platform independence, automatic memory management, and exception handling.

• Try and catch blocks are used for handling exceptions in Java.

• Static is a keyword used to create class-level variables and methods.

• ArrayList is a dynamic array that can grow and shrink in size, while HashSet is a collection that does not allow duplicates.

Runtime polymorphism allows a subclass to provide a specific implementation of a method that is already provided by its parent class.

• Runtime polymorphism is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its superclass.

• The method to be overridden must have the same name, return type, and parameters in both the superclass and subclass.

• When an object of the subclass is assigned to a reference variable ...read more

Threads in Java are created by extending the Thread class or implementing the Runnable interface, and invoked using the start() method.

• Threads can be created by extending the Thread class and overriding the run() method.

• Threads can also be created by implementing the Runnable interface and passing an instance of the class to a Thread object.

• Threads are invoked by calling the start() method on the Thread object.

JDBC involves steps like loading driver, establishing connection, creating statement, executing query and handling results.

• Load the JDBC driver using Class.forName() method

• Establish a connection to the database using DriverManager.getConnection() method

• Create a statement object using the connection.createStatement() method

• Execute the query using statement.executeQuery() method

• Handle the results using ResultSet object

Rest Template is a class in Spring that simplifies making HTTP requests and handling responses.

• Rest Template is part of the Spring framework in Java.

• It can be used to make HTTP requests to RESTful web services.

• It simplifies the process of making HTTP calls and handling responses.

• Rest Template can handle GET, POST, PUT, DELETE, etc. requests.

• Example: RestTemplate restTemplate = new RestTemplate();

Spring beans are Java objects managed by the Spring IoC container.

• Spring beans are defined in the Spring configuration file using XML or annotations.

• They are instantiated, assembled, and managed by the Spring IoC container.

• Beans can be singleton, prototype, request, session, or custom scoped.

• Dependency injection is used to inject dependencies into Spring beans.

Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.

• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It allows developers to quickly set up and run standalone Spring-based applications.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow for easy deployment.

• It promotes convention over configuration, reducing the amount of boilerplate code...read more