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Java 8 Streams : Count the occurrence of elements(List<String> list1) from list of text data(List<String> li


By : Matt Lamont
Date : August 01 2020, 08:00 PM
Hope this helps In real life scenarios you would have to consider that applying an arbitrary number of match operations to an arbitrary number of comments can become quiet expensive when the numbers grow, so it’s worth doing some preparation:
code :
Map<String,Predicate<String>> filters = elements.stream()
    .sorted(String.CASE_INSENSITIVE_ORDER)
    .map(s -> Pattern.compile(s, Pattern.LITERAL|Pattern.CASE_INSENSITIVE))
    .collect(Collectors.toMap(Pattern::pattern, Pattern::asPredicate,
        (a,b) -> { throw new AssertionError("duplicates"); }, LinkedHashMap::new));
filters.entrySet().stream()
    .map(e -> Map.entry(e.getKey(), listofComments.stream().filter(e.getValue()).count()))
    .sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
    .forEachOrdered(e -> System.out.printf("%-7s%3d%n", e.getKey(), e.getValue()));
Mangoes  3
Apple    2
Oranges  2
Figs     1


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C#: Count a dictionary Key (word) occurrence in a String (text) present in a list


By : John Smith
Date : March 29 2020, 07:55 AM
This might help you I added code, having more time complexity, but you can retrieve sentence having maximum occurrences of a word. Your task is to make it compatible with your problem and try to solve your problem by your own.
code :
 //Function to print maximum occurances of word from dictionary with sentence
    public static void FindSentenceWithMaxOcc(List<string> list, Dictionary<string, int>dict){

        int maxSentenceIndex = 0, index = 0;
        int maxCount = int.MinValue;
        string word = "";

        //Iterate through dictionary containing words with total occurances
        foreach(KeyValuePair<string, int> kv in dict){

            //Iterating through sentences present in list
            foreach(string element in list){
                //Split all words using space
                string[] words = element.Split(' ');
                //Count all occurrances of dictionary key in sentence
                int temp = Array.FindAll(words, s => s.Equals(kv.Key.Trim())).Length;

                //Get max occurrances 
                if(temp > maxCount){
                    maxCount = temp;
                    maxSentenceIndex = index;
                    word = kv.Key;
                }
                index++;
            }
            index = 0;
        }

        //Print result
        Console.WriteLine("Maximum count: " +maxSentenceIndex);
        Console.WriteLine("Word: " +word);
        Console.WriteLine("Sentence" +list[maxSentenceIndex]);
    }

How to use Java 8 Streams to pull a string value out of a list of objects and create a new list?


By : Marcello Massidda
Date : March 29 2020, 07:55 AM
wish helps you You have multiple syntax errors.
1)release is not a variable here.
code :
Set<String> oldIds = lastPage.getPage().getContent()
                         .stream()
                         .map(Release::getId).collect(Collectors.toSet());

List elements as comma seperated string - split and add to list using java 8 streams


By : GoldenBoy
Date : March 29 2020, 07:55 AM
this one helps. Lets say I have a List where an element could have a comma seperated String.
code :
list
    .stream()
    .flatMap(s -> Arrays.stream(s.split(","))
    .collect(Collectors.toList());

java 8 streams how to convert a Map<String, List<Strings>> to a List<String> will all the string value


By : Johannes
Date : March 29 2020, 07:55 AM
To fix the issue you can do You can do what you want using Stream.flatMap(Function).
code :
public static List<String> collectValues(Map<String, List<String>> map) {
    return map.values().stream()
            .flatMap(Collection::stream)
            .collect(Collectors.toList());
}
public static <E> List<E> collectValues(Map<?, ? extends Collection<? extends E>> map) {
    return map.values().stream()
            .flatMap(Collection::stream)
            .collect(Collectors.toList());
}
public static <C extends Collection<E>, E> C collectValues(
        Map<?, ? extends Collection<? extends E>> map, Supplier<C> collectionFactory) {
    return map.values().stream()
            .flatMap(Collection::stream)
            .collect(Collectors.toCollection(collectionFactory));
}
public static <C, E> C collectValues(Map<?, ? extends Iterable<? extends E>> map, 
                                     Collector<E, ?, C> collector) {
    return map.values().stream()
            .flatMap(iterable -> StreamSupport.stream(iterable.spliterator(), false))
            .collect(collector);
}

How to convert List<Object> to Map<String , List<String>> using java 8 streams?


By : user3434190
Date : March 29 2020, 07:55 AM
I hope this helps . I have Employee object which has rowId, skillId and student as below , Try use groupingBy and mapping
code :
list.stream()
     .collect(Collectors.groupingBy(Employee::getSkillId,
                    Collectors.mapping(Employee:getStudent, Collectors.toList())));
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