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javaoption-type

How to peek on an Optional?

I want to use the fluent api of Optional and apply two Consumers to it.

I'm dreaming about something like this:

Optional.ofNullable(key)
    .map(Person::get)
    .ifPresent(this::printName)
    .ifPresent(this::printAddress); // not compiling, because ifPresent is void

How do I apply several Consumers to an Optional?

Solution

  • You can use this syntax:

    ofNullable(key)
    .map(Person::get)
    .map(x -> {printName(x);return x;})
    .map(x -> {printAddress(x);return x;});