Malte Hartwig questions

Malte Hartwig answers

• How to chain lambdas with all optional values available at the innermost scope without nesting Optional#ifPresent()?
• How to group values from a list with Java Stream API (groupingBy collector)?
• How to get() specific element from HashSet? Kotlin
• Java split stream by predicate into stream of streams
• Is there a simple way in Java to get the difference between two collections using a custom equals function without overriding the equals?
• How to use Oracle regular expression in Java or how to map them?
• Java 8 stream groupBy pojo
• Java 8 One Stream To Multiple Map
• Java Long Stream contains specific number
• Optional monad and the Law of Demeter in Java