Java 8 stream map string to int

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Java 8 stream map string to int

// if choices are unique by name. Map result = choices.stream() .collect(Collectors.toMap(Choice::getName, Function.identity())); // owtherwise group by Map result = choices.stream() .collect(Collectors.groupingBy(Choice::getName)); Map result = Stream.of(choices).toMap(Choice::getName, Fn.identity()); // group by Map result = Stream.of(choices).groupTo(Choice::getName); ###Map to Pair List result = map.entrySet() .stream() .flatMap( entry -> entry.getValue() .stream() .map(string -> new Pair(entry.getKey(), string))) .collect(Collectors.toList()); List result = Stream.of(map) .flatMap(e -> Stream.of(e.getValue()).map(v -> Pair.of(e.getKey(), v))).toList(); Retrieving a List from a java.util.stream.Stream in Java 8 targetLongList = sourceLongList.stream() .filter(l -> l > 100) .collect(Collectors.toList()); targetLongList = Stream.of(sourceLongList).filter(l -> l > 100).toList(); Custom thread pool in Java 8 parallel stream stream.parallel(threadNum); Is there a concise way to iterate over a stream with indices in Java 8? String[] names = {"Sam", "Pamela", "Dave", "Pascal", "Erik"}; IntStream.range(0, names.length) .filter(i -> names[i].length() names[i]) .collect(Collectors.toList()); String[] names = {"Sam", "Pamela", "Dave", "Pascal", "Erik"}; IntStream.range(0, names.length) .filter(i -> names[i].length() names[i]) .toList(); // Or: indexed for any type of collection/iterator. Stream.of(collection).indexed()...; How can I throw CHECKED exceptions from inside Java 8 streams? (Not wrapping it into unchecked exceptions) Stream.of("java.lang.Object", "java.lang.Integer", "java.lang.String") .map(className -> try { Class.forName(className)) } catch (ClassNotFoundException ) { throw new RuntimeException(e); } .collect(Collectors.toList()); Stream.of("java.lang.Object", "java.lang.Integer", "java.lang.String") .map(Fn.ff(className -> Class.forName(className))) .toList(); Using Java 8's Optional with Stream::flatMap Optional result = things.stream() .map(this::resolve) .flatMap(o -> o.isPresent() ? Stream.of(o.get()) : Stream.empty()) .findFirst(); Optional result = things.stream() .map(this::resolve) .flatMap(Optional::stream) .first(); Limit a stream by a predicate // ??? No easy way to do it until Java 9 IntStream .iterate(1, n -> n + 1) .takeWhile(n -> n < 10) .forEach(System.out::println); IntStream .iterate(1, n -> n + 1) .takeWhile(n -> n < 10) .forEach(Fn.println); Java 8 NullPointerException in Collectors.toMap List answerList = new ArrayList(); answerList.add(new Answer(1, true)); answerList.add(new Answer(2, true)); answerList.add(new Answer(3, null)); Map answerMap = answerList.stream() .collect(Collectors.toMap(Answer::getId, Answer::getAnswer)); // throw NullPointerException // Works well. Map answerMap = answerList.stream().toMap(Answer::getId, Answer::getAnswer); Adding two Java 8 streams, or an extra element to a stream Stream stream = Stream.concat( Stream.concat( stream1.filter(x -> x!=0), stream2) .filter(x -> x!=1), Stream.of(element)) .filter(x -> x!=2); stream1.append(stream2).append(element); Java8: HashMap to HashMap using Stream / Map-Reduce / Collector Map x; Map y = x.entrySet().stream() .collect(Collectors.toMap( e -> e.getKey(), e -> Integer.parseInt(e.getValue()) )); Map y = Stream.of(x).toMap(e -> e.getKey(), e -> Integer.parseInt(e.getValue())); Does Java SE 8 have Pairs or Tuples? Yes, with the most beautiful design: Pair, Triple, Tuple Filter Java Stream to 1 and only 1 element List resultUserList = users.stream() .filter(user -> user.getId() == 1) .limit(2) .collect(Collectors.toList()); if (resultUserList.size() != 1) { throw new IllegalStateException(); } User resultUser = resultUserList.get(0); // Or by singletonCollector() public static Collector singletonCollector() { return Collectors.collectingAndThen( Collectors.toList(), list -> { if (list.size() != 1) { throw new IllegalStateException(); } return list.get(0); } ); } users.stream().filter(user -> user.getId() == 1).onlyOne(); What Java 8 Stream.collect equivalents are available in the standard Kotlin library? // Answers are included in the above link. Kotlin vs Java 8 on Collection Zipping streams using JDK8 with lambda (java.util.stream.Streams.zip) String[] a = {"a", "b", "c"}; String[] b = {"1", "2", "3"}; Stream.zip(a, b, Pair::of)...; Ignore duplicates when producing map using streams Map phoneBook = people.stream() .collect(Collectors.toMap( Person::getName, Person::getAddress, (address1, address2) -> { System.out.println("duplicate key found!"); return address1; } )); Map phoneBook = people.stream().toMap(Person::getName, Person::getAddress, Fn.ignoringMerger()); // Fn.replacingMerger() Is it possible to cast a Stream in Java 8? Stream.of(objects).filter(c -> c instanceof Client) .map(c -> ((Client) c).getID()).forEach(System.out::println); Stream.of(objects).select(Client.class).forEach(Fn.println); Java 8: How do I work with exception throwing methods in streams? stream.forEach(a -> safeFoo(a)); private void safeFoo(final A a) { try { a.foo(); } catch (Exception ex) { throw new RuntimeException(ex); } } stream.forEach(a -> Try.run(() -> a.foo())); Java 8 stream reverse order stream.reversed()... IntStream.of(1, 5, 3).reverseSorted()... Collect successive pairs from a stream // For Array/List only. IntStream.range(1, arrayList.size()) .mapToObj(i -> new Pair(arrayList.get(i-1), arrayList.get(i))) .forEach(System.out::println); // There is no general solution Stream created from iterator/collection.. // For any stream created from iterator/Collection/Array/List... stream().slidingMap(Pair::of).forEach(Fn.println()); Most efficient way to get the last element of a stream T last = stream.reduce((a, b) -> b).orElse(null); T last = stream.last().orElse(null); Java 8 Stream with batch processing stream.split(batchSize)... Merging two Map with Java 8 Stream API Map m1 = ImmutableMap.of("a", 2, "b", 3); Map m2 = ImmutableMap.of("a", 3, "c", 4); Map mx = Stream.of(m1, m2) .map(Map::entrySet) // converts each map into an entry set .flatMap(Collection::stream) // converts each set into an entry stream, then // "concatenates" it in place of the original set .collect( Collectors.toMap( // collects into a map Map.Entry::getKey, // where each entry is based Map.Entry::getValue, // on the entries in the stream Integer::max // such that if a value already exist for // a given key, the max of the old // and new value is taken ) ); Stream.of(m1).append(m2.entrySet()).toMap(Fn.key(), Fn.value(), Integer::max); Take every nth element from a Java 8 stream List list = ...; return IntStream.range(0, list.size()) .filter(n -> n % 3 == 0) .mapToObj(list::get) .collect(Collectors.toList()); Stream.of(list).step(3).toList(); Java 8, Streams to find the duplicate elements Integer[] numbers = new Integer[] { 1, 2, 1, 3, 4, 4 }; Set allItems = new HashSet(); Set duplicates = Arrays.stream(numbers) .filter(n -> !allItems.add(n)) //Set.add() returns false if the item was already in the set. .collect(Collectors.toSet()); Stream.of(numbers).groupByToEntry(Fn.identity(), Fn.counting()).filterByValue(occur -> occur > 1).keys().toList(); // Or: Multiset.of(numbers).entryStream().filterByValue(occur -> occur > 1).keys().toList(); How to map to multiple elements with Java 8 streams? Collection convert(List multiDataPoints) { Map result = new HashMap(); multiDataPoints.forEach(pt -> pt.keyToData.forEach((key, value) -> puteIfAbsent( key, k -> new DataSet(k, new ArrayList())) .dataPoints.add(new DataPoint(pt.timestamp, value)))); return result.values(); } // Or: Collection convert(List multiDataPoints) { return multiDataPoints.stream() .flatMap(mdp -> mdp.keyToData.entrySet().stream().map(e -> new Object() { String key = e.getKey(); DataPoint dataPoint = new DataPoint(mdp.timestamp, e.getValue()); })) .collect( collectingAndThen( groupingBy(t -> t.key, mapping(t -> t.dataPoint, toList())), m -> m.entrySet().stream().map(e -> new DataSet(e.getKey(), e.getValue())).collect(toList()))); } Stream.of(multiDataPoints) .flatMap(mdp -> Stream.of(mdp.keyToData).map(e -> Pair.of(e.getKey(), new DataPoint(mdp.timestamp, e.getValue())))) .groupBy(Entry::getKey, Entry::getValue).map(e -> new DataSet(e.getKey(), e.getValue())).toList(); Simplest way to print an IntStream as a String String result = "Hello world." .codePoints() //.parallel() // uncomment this line for large strings .map(c -> c == ' ' ? ' ': '*') .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append) .toString(); CharStream.of(result).map(c -> c == ' ' ? ' ': '*').println(); java.util.stream with ResultSet Stream.of(resultSet)... // Or: Stream.of(entityClass, resultSet)... //Or: sqlExecutor.stream(sql, parameters); How to use streams to find pairs of elements from two lists or array multiplication int[] one = new int[]{1, 2, 3}; int[] two = new int[]{3, 4}; List list = new ArrayList(); IntStream.of(one).forEach(i -> IntStream.of(two).mapToObj(j -> PrimitiveTuples.pair(i, j)).forEach(list::add)); System.out.println(list); Stream.of(1, 2, 3).cartesianProduct(Arrays.asList(3, 4)).forEach(Fn.println()); Page 2 You can't perform that action at this time. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session.

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