Functions In Optional Class:
empty → Returns an empty Optional instance
of→ Returns an Optional wrapping of the given value or throws a NullPointerException if this value is null
ofNullable→ Returns an Optional wrapping the given value or the empty Optional if this value is null
filter → If the value is present and matches the given predicate, returns this Optional; otherwise returns the empty one
map→ If a value is present, applies the provided mapping function to it
flatMap → If a value is present, returns the Optional resulting from the application of the provided mapping function to it; otherwise returns the empty Optional
get → Returns the value wrapped by this Optional if present; otherwise throws NoSuchElementException
ifPresent → If a value is present, invokes the specified consumer with the value; otherwise does nothing
isPresent→ Returns true if there is a value present; otherwise false
isEmpty → returns true if empty else false
orElse→ Returns the value if present or the given default value otherwise
orElseGet→ Returns the value if present or the one provided by the given Supplier otherwise
orElseThrow→ Returns the value if present or throws the exception created by the given Supplier otherwise
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