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# Optional

## Optional

|  |  |
|:-----:|:-------|
| `empty` |  Optional  |
| `filter` |   Optional  Optional  |
| `map` |  mapping  |
| `flatMap` |  mapping  Optional   Optional  |
| `get` |  Optional  NoSuchElementException  |
| `ifPresent` |  |
| `isPresent` |  true false |
| `of` |  Optional  null NullPointerException  |
| `ofNullable` |  Optional  null Optional  |
| `orElse` |  |
| `orElseGet` |  Supplier  |
| `orElseThrow` |  Supplier  |
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