Migrating from Google Guava Optional
Migrating from Google Guava Optional
Prior to Java 8, many applications used the http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/base/Optional.html class in the Google Guava library to implement similar behavior to java.util.Optional.
| Guava | Java 8 | |
|---|---|---|
| get() | get() | |
| absent() | empty() | |
| fromNullable(T) | ofNullable(T) | |
| of(T) | of(T) | non-null reference |
| or(T) | orElseGet(T) | |
| or(c.g.c.b.Supplier) | orElse(j.u.Supplier<? extends T>) | |
| isPresent() | isPresent() | |
| orNull() | orElseGet(null) | |
| transform(c.g.c.b.Function<? super T,V> function)) | map(j.u.Function<? super T,? extends U>) | |
| none | ifPresent(Consumer<? super T>) | |
| none | flatMap(j.u.Function<? super T, j.u.Optional>) | |
| none | filter(j.u.Predicate<? super T>) |