What you'll learn

Java collections are central to everyday Java development, yet they are frequently misused in production code. In this course, Java SE Foundation: Collections, you’ll learn to design data handling layers that are robust, expressive, and type-safe. First, you’ll explore the core behavioral contracts of the framework, moving beyond ArrayList to master the SequencedCollection interface for predictable ordering. Next, you’ll discover how to enforce data integrity using Sets for uniqueness and Maps for efficient associative lookups, while avoiding common hashing pitfalls. Finally, you’ll learn how to secure your application using modern immutable factories, defensive copying patterns, and fail-fast queue processing. When you’re finished with this course, you’ll have the skills and knowledge of the Java Collection Framework needed to write clear, correct, and high-performance code for modern enterprise systems.