How do I get the numbers in a String and then calculate the average of them?

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So I am currently experimenting with Streams and I try to calculate the average of the numbers in the String "589 Hello 56" in a stream. My approach is like this:

```List <int[]> experiment = a.stream()
.map(x -> x.replaceAll("[^0-9]", "").split("\\D+"))
.map(x-> Arrays.asList(x).stream().mapToInt(Integer::parseInt).toArray())
.collect(Collectors.toList());
```

So I first get a Stringarray with "589 56", because I split the String. But after that I try to convert everything to an Integerarray to get the average more easily and it doesn´t work, because the "589 56" converts to "58956". Does anyone have a better approach? Thanks in advance.

To calculate the average using stream, you need :

```double average = Arrays.stream(a.split("\\D+")) // split with non degits ["589", "56"]
.mapToInt(Integer::valueOf) // convert each string to integer [589, 56]
.average()  // OptionalDouble
.getAsDouble(); // double 322.5
```

Or if you are not sure that your string can contain any number, then you need to avoid this with :

```.orElse(0);
```

or

```.orElseThrow(() -> new IllegalArgumentException("no number in the string"));
```

instead of `.getAsDouble();`

Or if you want to go deeper and for example avoid cases where the numbers can be in front of any non digits for example `a45 Hello 9a7` where the numbers can be a part of a word, in this case you can go with Pattern and Matcher with this regex `\b\d+\b`, which use work boundary, like so :

```double average = Pattern.compile("\\b\\d+\\b")
.matcher(a)
.results()
.map(MatchResult::group)
.mapToInt(Integer::valueOf)
.average()
.orElse(0);
```

This last solution can work only from Java9+.

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Try this one

```String s = "589 Hello 56";
OptionalDouble average = Arrays.stream(s.split("\\D+"))
.mapToInt(Integer::parseInt)// or maybe  .mapToDouble(Double::parseDouble)
.average();
```

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The call to replaceAll strips all non-numeric characters from the string including the spaces. This converts '589 Hello 56' into '58956'. Try using `replaceAll("[^0-9\\s]", "")`.

You will also need to split on the separator characters (i.e., the spaces) instead of the digits.

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• Try this `Arrays.stream(s.split("\\D+")) .mapToInt(Integer::parseInt) .average();`
• FYI: `[^0-9]` and `\D` is the same thing, so you first remove all non-digit characters, then try to split on the now non-existent non-digits, which means that split will do thing.