Java

Which of the following is NOT a pillar of OOP in Java? #java #javaprogramming

Which keyword is used to skip the current iteration in Java? #java #javaprogramming

Which of these is a reserved keyword in Java? #java #javaprogramming

Which keyword is used to manually throw an exception in Java? #java #javaprogramming

What is the default value of a boolean variable in Java?

What is the result of this operation in Java #java #javaprogramming

Which of these is NOT a valid way to declare an array in Java? #java #javaprogramming

When working with relational databases in Java, 𝗝𝗗𝗕𝗖 (𝗝𝗮𝘃𝗮 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝘃𝗶𝘁𝘆) and 𝗝𝗣𝗔 (𝗝𝗮𝘃𝗮 𝗣𝗲𝗿𝘀𝗶𝘀𝘁𝗲𝗻𝗰𝗲 𝗔𝗣𝗜) are two popular approaches. Both aim to achieve data persistence, but differ significantly in how they operate. 𝗝𝗗𝗕𝗖 (𝗝𝗮𝘃𝗮 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝘃𝗶𝘁𝘆) ➤ A low-level API provided by Java for directly interacting with relational databases. ➤Offers general-purpose classes and interfaces for database connectivity and SQL operations, but requires a database-specific JDBC driver to facilitate communication with the database. ➤ Developers must manually write SQL queries, manage database connections, and handle results. ➤ Offers complete control over SQL queries and database operations but can be verbose and prone to repetitive code. ➤ Databases like MySQL, PostgreSQL, Oracle provide their own database-specific JDBC drivers. 𝗝𝗣𝗔 (𝗝𝗮𝘃𝗮 𝗣𝗲𝗿𝘀𝗶𝘀𝘁𝗲𝗻𝗰𝗲 𝗔𝗣𝗜) ➤A higher-level API provided by Java to manage database interactions using Object-Relational Mapping (ORM). ➤ Serves as a specification that defines rules, interfaces, and annotations for ORM, but does not include a runtime implementation. ➤Simplifies database operations by mapping Java objects to database tables, eliminating the need for most manual SQL writing. ➤ Minimizes boilerplate code, accelerates development, and improves maintainability but comes with overhead and delay ➤Popular implementations of JPA include Hibernate (the most popular), Apache OpenJPA, and EclipseLink. JPA requires JDBC to interact with the database; it cannot interact with a database independently. Attached image shows how JPA and JDBC work together. #java #javaprogramming

Which package is automatically imported into every Java program? #java #javaprogramming

Which of the following is a singleton class in java? #java #javaprogramming