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Managing system resources and memory is critical for building stable, high-performance Java applications. This comprehensive, text-only guide teaches you how to interact with the file system and understand how Java manages memory behind the scenes. You will start with the absolute basics of Java I/O, progress to modern file-handling techniques, and discover how the Java Virtual Machine automatically cleans up unused objects to prevent memory leaks. By the end of this course, you will write cleaner, safer code that efficiently manages both external files and internal system memory. What you'll learn: - Understand core Java I/O concepts, streams, and the differences between byte and character data. - Read and write files safely using modern Java NIO.2 APIs like Path and Files. - Implement automatic resource management using the try-with-resources statement to prevent resource leaks. - Master the fundamentals of Java Garbage Collection and how the JVM identifies unreachable objects. - Explore different garbage collection phases and modern garbage collectors at a conceptual level. - Practice writing robust code that handles file-system exceptions and optimizes memory usage. The course begins with foundational definitions of files, streams, and memory management before guiding you through practical code examples and structured reading exercises. You will move from basic file operations to advanced resource management and JVM memory tuning concepts. This course is designed for beginner to intermediate Java developers who want to deepen their understanding of system resources and JVM internals. No advanced programming experience is required. Start reading today to write highly efficient, leak-free Java applications.