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Use Java filter on stream with in a stream filter


Use Java filter on stream with in a stream filter

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Use Java filter on stream with in a stream filter
Tag : java , By : Wilfred Knigge
Date : January 11 2021, 05:14 PM

wish helps you You can use anyMatch on the inner stream:
items.stream().filter(a->a.getAddress().stream().
      anyMatch(b->"lane1".equals(b.getLane()))).collect(Collectors.toList());

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Java 8 stream findFirst throwing NPE, Unable to filter out nonNull objects from stream


Tag : java , By : brennen
Date : March 29 2020, 07:55 AM
it fixes the issue You're calling filter() on the Optional>, instead of calling it on the Stream.
Use
Optional<String> innerValue = Optional.ofNullable(outermost) // outermost var can be null, hence using Optional.ofNullable
            .map(OuterMost::getOuter)
            .map(Outer::getNested)
            .map(nestedList -> nestedList.stream().filter(Objects::nonNull))
            .flatMap(Stream::findFirst)
            .map(Nested::getInner)
            .map(Inner::getFoo);

Java 8 Stream filter to filter specific portion of a file


Tag : java , By : John Bentley
Date : March 29 2020, 07:55 AM
I hope this helps you . There is a java 9 stream api takeWhile and dropWhile, which take a predicate as an argument.
takeWhile(s->s.contains("Another input"))
.dropWhile(s->s.contains("Input data"))
 Stream<String> output = Files
        .lines(Paths.get("a.out"))
    List<String> partition = output
        .filter(new StartData())
        .filter(new EndData())
        .collect(toList);
class StartData implements Predicate<String> {

  boolean matchingData = false;

  boolean test(String input) {
    if (input.contains("Input data")) {
      matchingData = true;
    }
    return matchingData;
  }
}
class EndData implements Predicate<String> {

  boolean passThrough = true;

  boolean test(String input) {
    if (input.contains("Another Input")) {
      passThrough = false;
    }
    return passThrough;
  }
}
}

Collect stream only if allMatch filter and process stream once in Java


Tag : java , By : Anonymous
Date : March 29 2020, 07:55 AM
seems to work fine I have the following stream code: , This would be a job for Java 9:
List<Data> results = items.stream()
    .map(item -> requestDataForItem(item))
    .takeWhile(data -> data.isValid())
    .collect(Collectors.toList());
List<Data> results = new ArrayList<>();
for(Item item: items) {
    Data data = requestDataForItem(item);
    if(!data.isValid()) break;
    results.add(data);
}

filter duplications by property name with java stream filter


Tag : java , By : silvervino
Date : March 29 2020, 07:55 AM
Does that help You may first create a map using the task name as the key and the relevant Task as the value. Ignore the duplicate Tasks merely by using a mergeFunction. Then get all the distinct tasks as a Set view.
Set<Task> distinctTasks = tasks.stream().collect(Collectors.collectingAndThen(
    Collectors.toMap(Task::getName, Function.identity(), 
        (a, b) -> a), m -> new HashSet<>(m.values())));

Java Stream filter - how can i filter data without wrapping the filter code in 'if' condition for checking null on the f


Tag : development , By : user158220
Date : March 29 2020, 07:55 AM
it should still fix some issue I am doing the following: , An additional option is to do the null checks in the predicate:
.filter(o -> source.equals(o.getSource()) 
             && (null == date || date.equals(o.getDate()))
             && (null == id || id.equals(o.getId())))
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