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Optional::stream returns a Stream containing the value if it is present and else an empty stream. So for a Stream<Optional> optionals, optionals.flatMap(Optional::stream) returns a …
The Optional class is declared as final in Java. Nevertheless, it contains two methods, flatMap and or with the following signatures: public Optional flatMap(Function
I want to replace two ternary operator by a java 8 optional expression Here is the two ternary operator: valueA and valueB are string valueA != null ? valueA.length() < 3 ? "0"+valueA : ...
Suppose I have a class such as this : @Builder class AnIdentifier { @NonNull //to indicate required to builder private String mandatoryIdPart; private Optional
How do I pick the value from the method ifPresent, as this method returns void? The logic that I want to apply is: If the object deliveryInfo is not null, take the delivery quantity and set it into …
In Java 8, I want to do something to an Optional object if it is present, and do another thing if it is not present. if (opt.isPresent()) { System.out.println(“found”); } else { System.out….