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.
