What are some examples of using Optional in Java 8?

Can you give me some examples of using Optional in Java 8?

Sure! In Java 8, Optional is a container that may or may not contain a non-null value. Here's a simple example:

Optional<String> optionalString = Optional.of("Hello, World!");
optionalString.ifPresent(s -> System.out.println(s));

This will print "Hello, World!" if the value is present.

What happens if the value is not present?

If the value is not present, you can use methods like orElse() or orElseGet(). For example:

Optional<String> emptyOptional = Optional.empty();
String value = emptyOptional.orElse("Default Value");
System.out.println(value); // This will print "Default Value"

Can I chain methods with Optional?

Yes, you can chain methods! For instance, you can use map() to transform the value if it's present:

Optional<String> optionalName = Optional.of("John");
Optional<Integer> nameLength = optionalName.map(String::length);
nameLength.ifPresent(length -> System.out.println(length)); // Prints the length of the name