Java File and Data I/O: Streams, Serialization, and JSON

Managing data flow is a fundamental skill for any developer, yet handling files, streams, and data formats can quickly become overwhelming. This text-only course guides you step-by-step through the essentials of Java input/output operations, helping you confidently read, write, and manipulate external data. You will transition from writing simple console applications to building robust programs that interact with the file system, serialize Java objects, and parse complex JSON data. By mastering modern Java I/O APIs and standard libraries, you will write cleaner, more efficient, and secure data-handling code. What you will learn: 1. Understand foundational I/O concepts, including byte streams, character streams, and the modern NIO.2 Path and Files APIs. 2. Read and write text files efficiently using modern Java features like text blocks for cleaner multi-line strings. 3. Serialize and deserialize Java objects safely to persist application state across sessions. 4. Process JSON data seamlessly using the industry-standard Jackson library to map files to Java objects. 5. Apply robust error handling with try-with-resources to manage system resources and prevent memory leaks. 6. Practice data validation and basic security principles when reading untrusted input files. The course begins with essential terminology, explaining how streams move data before introducing file system operations. You will then progress through object serialization, modern JSON processing with Jackson, and resource management techniques. This course is designed for beginner to intermediate Java developers who want to master data persistence and file manipulation. No prior experience with file I/O is required, though a basic understanding of Java syntax is recommended. Start reading today to master the flow of data in your Java applications.