Summary of "Optionals In Java - Simple Tutorial"
The video explains the concept of Optionals in Java, containers that may or may not have a value. Optionals are used as return types in methods where null might be returned. Methodology:
- Optionals are used to inform users about the possibility of a value not existing.
- Use Optional.ofNullable
to place a value in an Optional.
- Utilize isPresent
to verify the existence of a value before calling get
.
- Use orElse
to set a default value if the Optional is empty.
- Use orElseGet
with a lambda supplier function for a default value.
- Avoid using get
directly to prevent exceptions; check isPresent
first.
- Use map
to change the contents of an Optional and extract specific values.
- Optionals are preferable as return types rather than method parameters.