IntStream、LongStream、DoubleStream:表示元素为基本类型int、long、double的序列。 Stream API提供了一种类似于SQL语句的查询机制,包括:过滤、映射、聚合等操作。 Stream API的核心思想是把集合中的数据转换为流,在流中对数据进行操作,然后再把流转换为集合。这个过程中,不需要对集合中的数据进行手动操作,而是通过Str...
// 创建一个Lambda表达式Function<Integer,Integer>square=(num)->num*num;// 使用Lambda表达式进行排序List<Integer>numbers=Arrays.asList(1,2,3,4,5);Collections.sort(numbers,(a,b)->a.compareTo(b));// 使用Stream API过滤数据List<String>names=Arrays.asList("Alice","Bob","Charlie","David");...
* See the class documentation for {@linkStream} and the package documentation * for java.util.stream for additional * specification of streams, stream operations, stream pipelines, and * parallelism, which governs the behavior of all stream types. * *@param<T> the type of the stream elements...
Full API documentation is availablehere. Take a look at theCheatsheetfor brief introduction to the StreamEx! Before updating StreamEx check themigration notesand full list ofchanges. StreamEx library main points are following: Shorter and convenient ways to do the common tasks. ...
int sum = widgets.stream() .filter(w -> w.getColor() == RED) .mapToInt(w -> w.getWeight()) .sum(); In this example,widgetsis aCollection<Widget>. We create a stream ofWidgetobjects viaCollection.stream(), filter it to produce a stream containing only the red widgets, and then...
方法二: 使用stream流实现 1/**2* 使用Stream流方式实现(推荐使用这个方式)3*4*@authorlyh5*@versionv-1.0.06*@since2021/5/207*/8publicclassStreamTest {9publicstaticvoidmain(String[] args) {10List<Person> listA =newArrayList<Person>();11//模拟关联方传递过来的数据列表12listA.add(newPerson("...
int sum = widgets.stream() .filter(w -> w.getColor() == RED) .mapToInt(w -> w.getWeight()) .sum(); See the class documentation forStreamand the package documentation forjava.util.streamfor additional specification of streams, stream operations, stream pipelines, and parallelism. ...
StreamEx 0.8.3 Enhancing the Java Stream API. This library defines four classes:StreamEx,IntStreamEx,LongStreamEx,DoubleStreamExthat are fully compatible with the Java 8 stream classes and provide many useful additional methods. Also, theEntryStreamclass is provided which represents a stream of ma...
Combine advanced operations of the Stream API to express rich data processing queries. Processing Data with Java SE 8 Streams, Part 1by Raoul-Gabriel Urma Use stream operations to express sophisticated data processing queries. Ease of Use
Sets the designated parameter to the given input stream, which will have the specified number of bytes. void setAsciiStream(String parameterName, InputStream x, long length) Sets the designated parameter to the given input stream, which will have the specified number of bytes. void setBigDecima...