Is there a way to use Stream() inside of Stream()?

Question

I have the below object, I would like to use Stream() in order to get the first input param where the name is equal to "target" is it possible? or I can only stream the inputParam?

    "flow": [
        {
            "step": [
                {
                    "inputParam": [
                        {
                            "name": "inputname",
                            "value": "value"
                        }
                    ]
                }
            ]
        }
    ]
}```

have you tried? If the element a Stream iterates over is a Collection of sorts, why wouldn't you be able to use a Stream? — Stultuske, Apr 21 '21 at 07:33

Arun Gowda · Accepted Answer · 2021-04-21T07:46:09.817

1

Use flatMap in streams.

more about map and flat map

 Optional<InputParam> optionalInputParam = flowCollection.stream()
                .flatMap(flow -> flow.getSteps().stream())
                .flatMap(step -> step.getInputParams().stream())
                .filter(inputParam -> inputParam.getName().equals("target"))
                .findFirst();

This is assuming you have steps in Flow object and inputParams in Step object and have defined getters on these attributes.

edited Apr 21 '21 at 07:46

answered Apr 21 '21 at 07:40

Arun Gowda

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Thanks! this is the solution. Stream is new to me so im still learning. – Shmuel P. Apr 21 '21 at 07:47

Is there a way to use Stream() inside of Stream()?

1 Answers1