Optional
You can view the program of this course at the link - https://docs.google.com/document/d/1H...
Optional is a new class in the java.util package, it is a container (wrapper) for values that can also safely contain null. First appeared in Java 1.8. It is used to reduce the amount of code and increase reliability when working with null.
Link to the notes of this lecture - https://drive.google.com/file/d/1XMI2...