Java SE 21: Programming II Training

Based on the Official Oracle Curriculum, this is the second-level training for developers learning the Java language. It builds upon the foundations laid in the "Java SE: Programming I" course and covers advanced topics such as object-oriented programming (OOP), modular architecture, secure coding, database integration, use of Lambdas, and developing multithreaded applications.

This course uses the current version of Java: Java SE 21.

Completion of Java SE 21: Programming I or equivalent experience

By the end of this training, you will have gained knowledge and skills in the following areas:

• Develop Java applications using object-oriented principles such as encapsulation, inheritance, and polymorphism

• Execute Java applications from the command line

• Work effectively with the Java Collections Framework

• Use Lambda expressions to filter and process collections

• Manage exceptions with robust exception handling strategies

• Perform file input/output operations

• Manage file systems using the JDK NIO.2 API

• Perform CRUD operations using JDBC and JPA technologies

• Implement parallel operations and concurrency using Lambda expressions

• Apply modular programming practices for scalable application architecture

• Build high-performance, multithreaded applications

🔹 1. Functional Programming

• Lambda expressions and Functional Interfaces

• Built-in functional interfaces: Predicate, Consumer, Function, etc.

• Stream API usage: stream(), filter(), map()

• Writing clean and readable functional code using Java Streams

🔹 2. Modular Programming

• Fundamentals of Java’s module system (JPMS)

• module-info.java syntax and structure

• Defining modules and services in applications

• Migrating legacy projects to a modular structure

🔹 3. Stream and Parallel Stream Operations

• Understanding Parallel Streams and their advantages

• Enhancing performance with parallel processing

• Terminal operations using Collectors

• Creating and managing custom streams

🔹 4. Concurrency and Multithreading

• Writing multi-threaded applications

• Using ExecutorService, Callable, and Runnable

• Thread synchronization and handling race conditions

🔹 5. Java API & Secure Coding Practices

• Core I/O fundamentals: InputStream, OutputStream, Reader, Writer

• Modern file operations with NIO.2: Path, Files, DirectoryStream

• Best practices for writing secure Java code

🔹 6. Database Applications (JDBC & JPA)

• Connecting to databases using JDBC API

• Preventing SQL injection with PreparedStatement

• Using JPA for Object-Relational Mapping (ORM)

• Executing CRUD operations with hands-on examples

🔹 7. Localization

• Implementing locale-based features with Locale, ResourceBundle, DateFormat, and NumberFormat

• Building applications that support multiple languages

🔹 8. Collections and Generics

• Overview of Java Collections Framework: List, Set, Map, Queue

• Using Iterator and Iterable interfaces

• Type safety with Generics

• Working with Wrapper classes (Integer, Double, Boolean, etc.)

🔹 9. Exception Handling and Assertions

• Difference between checked and unchecked exceptions

• Creating and handling custom exceptions

• Using try, catch, finally, throw, and throws

• Validating assumptions with assert