Create a list from instance variables of items in array using streams [duplicate]

Question

I have an array of items, and I want to create a list (or any iterable) from an instance variable belonging to them.

public void foo(final MyClass... args) {
    final List<Baz> properties = new ArrayList<>();
    for (final MyClass a : args) {
        properties.add(a.getProperty());
    }
}

How would I do this using a one-liner stream?

So an instance of MyClass has a property of type MyClass? Am I getting this right? — deHaar
– deHaar, Commented Jul 2, 2020 at 12:20
Fixed both, wrote this without compiling it and I jump between programming languages — Michael Bianconi
– Michael Bianconi, Commented Jul 2, 2020 at 12:24
Arrays.stream(args).map(MyClass::getProperty).collect(Colectors.toList()); ? — Eritrean
– Eritrean, Commented Jul 2, 2020 at 12:30

user4910279 · Accepted Answer · 2020-07-02 12:31:00Z

3

List<Baz> list = Arrays.stream(args).map(MyClass::getProperty).collect(Collectors.toList());
Iterable<Baz> iterable = () -> Arrays.stream(args).map(MyClass::getProperty).iterator();

answered Jul 2, 2020 at 12:31

user4910279

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Shyam Baitmangalkar · Accepted Answer · 2020-07-02 12:32:14Z

0

Assuming that getProperty() method of MyClass returns an object of type Baz

List<Baz> properties = Stream.of(args)
.map(myClazz -> myClazz.getProperty())
.collect(Collectors.toList())

answered Jul 2, 2020 at 12:32

Shyam Baitmangalkar

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