Is Optional class methods compulsory in Java?

In this tutorial, we’re going to show the Optional class that was introduced in Java 8.

Introduction To Optional :

Optional<T> is a wrapper class with a very simple functionality.

A container object which may or may not contain a non-null value. If a value is present, isPresent() will return true and get() will return the value.

Optional<Employee> employeeOptional = OptionalTest.getEmployeeOpt();
if(employeeOptional.isPresent()) {
    System.out.println("Employee : " + employeeOpt.get());
}

Additional methods that depend on the presence or absence of a contained value are provided, such as orElse() (return a default value if value not present) and ifPresent() (execute a block of code if the value is present).

Optional<Employee> employeeOptional = Optional.ofNullable(OptionalTest.getEmployeeOpt().orElse(defaultEmployee()));

There are three ways to create an instance of Optional:

// an empty ‘Optional’;
Optional<String> empty = Optional.empty();

// an ‘Optional’ where you know that it will not contain null;
Optional<String> mustNonNull = Optional.of(“Some String”);