Can you explain what the Optional class in the Java programming language is?

In Java, the Optional<T> class represents a container that may either contain a value of type T or be empty (absence of a value). It helps to avoid errors related to null (for example, NullPointerException) and makes the code more readable and safe.

Main features of Optional:

• Creating an object with or without a value:

  Optional<String> maybeName = Optional.of("Alice");
  Optional<String> empty = Optional.empty();
  

• Checking for the presence of a value:

  if (maybeName.isPresent()) {
      System.out.println(maybeName.get());
  }
  

• Alternative actions when the value is absent:

  String name = maybeName.orElse("Unknown");
  

Using Optional helps to explicitly handle the possible absence of a value, reducing the risk of errors.