How to use foreach in streams for my custom object?

Question

I need to iterate over Objects and add every elements name to ArrayList. My class Command contains getName() method.

commands = List< Command >

I've done it without streams.

     ArrayList<String> commandList = new ArrayList<String>(); for
     (Command currentCommand : commands.getCommands()) {
     commandList.add(currentCommand.getName()); }

Here's what I've got now:

commands.getCommands().forEach(command -> { command.getName(); });

I want to do it in one line using streams

score 4 · Accepted Answer · answered Jul 24 '19 at 07:28

4

Try this

commands.getCommands().stream().map(Command::getName).collect(toList());

answered Jul 24 '19 at 07:28

Hadi J

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It should be commands.getCommands().stream().map(Command::getName).collect(Collectors.toList()); but it does not save it to commandList array in one line – Piotr Szczepanik Jul 24 '19 at 08:05
1

Don’t forget the assignment, `List commandList = …` – Holger Jul 24 '19 at 12:25

How to use foreach in streams for my custom object?

1 Answers1