← Exit to Module 9: Advanced Core Features lessons
Module progress · 0%Lesson · 14 min
Module 9: Advanced Core Features
Lesson focusOptional Usage Patterns
Model absence safely with Optional while avoiding anti-patterns.
01 · 15 minString Pool & Memory ManagementLocked02 · 12 minStringBuilder vs StringBufferLocked03 · 16 minFormatting & LocalizationLocked04 · 20 minRegular Expressions, Pattern & MatcherLocked05 · 18 minFile I/O with java.ioLocked06 · 18 minModern I/O with NIO.2Locked07 · 15 minSerialization BasicsLocked08 · 14 minOptional Usage PatternsLocked09 · 30 minMini-Project: Log File AnalyzerLocked
Return Optional from methods rather than accepting it as a parameter.
Chain transformations with map, flatMap, or provide defaults with orElseGet.
Avoid using Optional for fields in DTOs; prefer plain nullable references serialized via JSON frameworks.