**float (primitive):** Default 0.0f for class fields; locals must be initialized. **Float (wrapper):** Default null. Primitives can't be null; wrappers can.
**When to Use:** Primitive for performance, arrays, computation. Float for generics (List<Float>), Optional, nullable schema (DB NULL).
**Production:** DTOs from DB—use Float for nullable columns. Internal computation—use float....
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