Java Optional

Mar 25, 2023

• Creating an Optional object:   
  • To create an Optional object with a non-null value, use the static method Optional.of(T value).   
  • To create an Optional object that may or may not contain a null value, use the static method Optional.ofNullable(T value)
• Retrieving the value from an Optional object:
  • To retrieve the value from an Optional object, use the method get(). This will throw a NoSuchElementException if the Optional is empty.
  • To retrieve the value from an Optional object or return a default value if it is empty, use the method orElse(T other)
• Checking if an Optional object contains a non-null value:
  • To check if an Optional object contains a non-null value, use the method isPresent(). This returns true if there is a non-null value and false otherwise

• Optional (Java Platform SE 8 )