How can I Use Collectors to collect in a ConcurrentHashMap instread of putting manually into ConcurrentHashMap
ConcurrentHashMap<String, String> configurationMap = new ConcurrentHashMap<>();
List<Result> results = result.getResults();
results.stream().forEach(res -> {
res.getSeries().stream().forEach(series -> {
series.getValues().stream().forEach(vals ->{
configurationMap.put(vals.get(1).toString(),vals.get(2).toString());
});
});
});
//Note: vals is List<List<Object>> type
Help will be appreciated.
You can use Collectors.toConcurrentMap
results.stream()
.flatMap(res -> res.getSeries().stream())
.flatMap(series -> series.getValues().stream())
.collect(Collectors.toConcurrentMap(
vals -> vals.get(1).toString(),
vals -> vals.get(2).toString()));
We can do this as follows also:
results.stream()
.flatMap(res -> res.getSeries().stream())
.flatMap(series -> series.getValues().stream())
.collect(Collectors.toMap(
vals -> vals.get(1).toString(),
vals -> vals.get(2).toString(),
(vals1,vals2) -> vals2,
ConcurrentHashMap::new);
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