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8.2 Optional Idioms: orElse vs orElseGet Pitfalls
Topic Summary
Avoid NullPointerException safely and understand why optional.orElse(compute()) evaluates eagerly even when value exists.
What You Will Learn
• Understand the intended purpose of `java.util.Optional` (method return types).
• Fix the eager evaluation bug: `orElse()` vs `orElseGet(Supplier)`.
• Chain optional transformations using `.map()` and `.flatMap()`.
Included in Java Intermediate: Collections, Streams & Modern OOP • Lifetime access for ₹99