"null object pattern vs optional"

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1. what is a null object block pattern ••• /mo •••
2. java optional vs null ••• /mo •••
3. objects nonnull vs null ••• /mo •••
4. optional.empty vs null ••• /mo •••
5. pattern cannot be null or empty ••• /mo •••
6. using optional for null check ••• /mo •••
7. null check with optional ••• /mo •••
8. check if optional is null ••• /mo •••
9. non-null object ••• /mo •••
10. optional of vs optional of nullable ••• /mo •••
11. null vs not null ••• /mo •••
12. c# optional parameter null ••• /mo •••

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