Java8: Create list of object using enum value

Question

I have a list of enum like this :

public enum Fruit {
   Apple,
   Mango,
   Banana,
   kiwi
}

and I have class like this

public class FruitShop {
    private String name;

    public FruitShop(String name) {
       this.name = name
}

I want to create a list of object of FruitShop class passing each enum as an arument

List<FruitShop> shoplists = new new ArrayList<>()
shoplists.add(Fruit.Apple.name())
shoplists.add(Fruit.Mango.name())
shoplists.add(Fruit.Banana.name())
shoplists.add(Fruit.kiwi.name())

How can I achieve this using java8 stream?

did you try something? what didn't work? and does shoplists.add(Fruit.Apple.name()) work with your existing code? — Naman
– Naman, Commented Jun 30, 2020 at 20:52

Youcef LAIDANI · Accepted Answer · 2020-06-30 20:39:02Z

4

You can use EnumSet with stream like this:

List<FruitShop> shoplists = EnumSet.allOf(Fruit.class).stream()
        .map(f -> new FruitShop(f.name()))
        .collect(Collectors.toList());

answered Jun 30, 2020 at 20:39

Youcef LAIDANI

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Comments

Eklavya · Accepted Answer · 2020-06-30 20:57:13Z

3

You can use Fruit.values() then map to create FruitShop and collect as list

List<FruitShop> shoplists = Stream.of(Fruit.values())
                                  .map(f -> new FruitShop(f.name()))
                                  .collect(Collectors.toList());

edited Jun 30, 2020 at 20:57

answered Jun 30, 2020 at 20:44

Eklavya

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2 Comments

Naman Over a year ago

...or use Arrays.stream(Fruit.values())

Holger Over a year ago

or EnumSet.allOf(Fruit.class).stream()

lczapski · Accepted Answer · 2020-07-01 09:20:30Z

0

Other approach:

Arrays.stream(Fruit.values())
        .map(Fruit::name)
        .map(FruitShop::new)
        .collect(Collectors.toList());

answered Jul 1, 2020 at 9:20

lczapski

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