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import static java.util.Comparator.comparing; import static java.util.stream.Collectors.toList; List<String> lowCaloricDishesName = menu.stream() .filter(d -> d.getCalories() < 400) //选出400卡路里以下的菜肴 .sorted(comparing(Dish::getCalories)) .map(Dish::getName) //提取菜肴的名称 .col...
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return new StatelessOp<P_OUT, R>(this, StreamShape.REFERENCE,StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) { //增加了opWrapSink方法,第一个参数是标志 = 95,第二个是 ChainedReference 对象 //这个方法会在结果态的时候调用 @Override Sink<P_OUT> opWrapSink(int flags, Sink<R> sink) {...
Map<Integer, String> stringMap = list.stream().collect(Collectors.toMap(DemoEntity::getId, DemoEntity::getName)); // 2.取list中的某个值成list或set List<Integer> integers = list.stream().map(DemoEntity::getId).collect(Collectors.toList()); Set<String> strings = list.stream().map(Demo...
继续深入Stream的底层实现过程 2.spliterator()# 接上https://www.cnblogs.com/bigbaby/p/12159495.html 我们这次回到最开始源码分析的地方 Copy publicstatic<T> Spliterator<T>spliterator(Collection<? extends T> c,intcharacteristics){returnnewIteratorSpliterator<>(Objects.requireNonNull(c), ...
1、stream stream是串行的,可以理解为它的执行是按顺序执行的。 2、parallelStream parallelStream是并行的,可以理解为它的执行不是按顺序执行的,它的原理采用了分治的原理去实现,可以点击查看Fork/Join,我就不多做解释啦,并行是为了充分利用CPU的性能,如果CPU不太行的话,还是不用吧,并行执行会有不确定性,而且不是...
io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.lang.reflect.Field; import java.security.*; import java.util.Base64; import java.util.HashMap; public class SignObjectTest2 { public static void main(String[] args) throws Exception { String AbstractTranslet = "com....
privateList<Integer>getIdListFromEsSearchResult(SearchResult searchResult){SearchHit[]searchHits=searchResult.getHits().getHits();List<Integer>idList=Arrays.asList(searchHits).stream().map(SearchHit::getSourceAsMap).map(o->Integer.parseInt(String.valueOf(o.get("id"))).collect(Collectors.toList...
ObjectInputStream.GetField ObjectInputValidation ObjectInstance ObjectName ObjectNotActive ObjectNotActiveHelper ObjectOutput ObjectOutputStream ObjectOutputStream.PutField ObjectReferenceFactory ObjectReferenceFactoryHelper ObjectReferenceFactoryHolder ObjectReferenceTemplate ObjectReferenceTemplateHelper...