Pragmatic Play Senior Technical Support Engineer Interview Questions and Answers

There are two types of JDBC connections: Type 1 and Type 4.

• Type 1: JDBC-ODBC bridge driver, requires ODBC driver to connect to the database

• Type 4: Direct-to-database pure Java driver, no need for additional software

• Type 4 is more commonly used due to better performance and platform independence

Java is a programming language used to create applications that can run on any platform.

• Java is used to develop desktop, web, mobile, and enterprise applications.

• It is known for its platform independence, allowing programs to run on any device with a Java Virtual Machine (JVM).

• Java is object-oriented, making it easier to organize and manage code.

• It is widely used in the development of Android apps, server-side applications, and financial software.

The servlet life cycle refers to the stages a servlet goes through from initialization to destruction.

• Initialization: Servlet is loaded, instantiated, and initialized.

• Servicing client requests: Servlet handles client requests by calling service() method.

• Destruction: Servlet is removed from service and destroyed by the container.

JDBC is a Java API for connecting and executing SQL queries on a database. Templates provide reusable code for common database operations.

• JDBC stands for Java Database Connectivity, allowing Java programs to interact with databases.

• JDBC provides classes and interfaces for connecting to a database, sending queries, and retrieving results.

• JDBC templates are pre-defined code structures that simplify common database operations like querying, updating, and deleting data.

• Templates ...read more

Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.

• Hash map uses a hash function to determine the index of the key-value pair in the underlying array.

• Collisions can occur when multiple keys hash to the same index, which is resolved using techniques like chaining or open addressing.

• Hash map provides constant time complexity O(1) for insertion, deletion, and lookup operations on average.