Example of using Guava to flatten a nested List in Java. List<Integer> output = Lists.newArrayList( Iterables.concat(list)); System.out.println(output);//prints://[1, 4, 3, 12, 17, 14, 31, 39, 32]Code language:Java(java)
In out case, to get the flattenedList, we need to iterate overStreamand merge consecutive lists into one for each successive nestedList. Note that due to extra instances ofArrayListcreated at runtime, this method does not give good performance for large nested lists. List<String>flatList=nested...
In order to flatten this nested collection into a list of strings, we can use forEach together with a Java 8 method reference: public <T> List<T> flattenListOfListsImperatively( List<List<T>> nestedList) { List<T> ls = new ArrayList<>(); nestedList.forEach(ls::addAll); return ls...
Java - Bitwise Complement Operator Java Constructor & Types Java - Constructor Java - Copy Constructor Java - String Constructors Java - Parameterized Constructor Java Array Java - Array Java - Accessing Array Elements Java - ArrayList Java - Passing Arrays to Methods Java - Wrapper Class Java -...
我正在用Java构建一个基本的战舰式游戏,并使用嵌套列表来表示游戏网格.但是,当我试图放下一艘船时,我一直得到IndexOutOfBoundsException. 游戏板具有如下构造函数 public Board(){ theSea = new ArrayList<ArrayList<ShipInterface>>(10); for(int i = 0; i < theSea.size(); i++){ theSea.set(i, new...
at jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302) ~[?:?] at java.util.Objects.checkIndex(Objects.java:385) ~[?:?] at java.util.ArrayList.get(ArrayList.java:427) ~[?:?] at org.jooq.impl.DefaultBinding$DefaultRecordBinding.lambda$13(DefaultBinding.java:4662) ~[classes/...
Java实现 1publicclassNestedIteratorimplementsIterator<Integer>{2Stack<NestedInteger>stack;34publicNestedIterator(List<NestedInteger>nestedList) {5stack =newStack<>();6for(inti = nestedList.size() - 1; i >= 0; i--) {7stack.push(nestedList.get(i));8}9}1011@Override12publicInteger next() ...
"reduce_script": "ArrayList huanbi_reduce = new ArrayList();for(huanbi in states){huanbi_reduce.add(huanbi)} return huanbi_reduce;" } } } } 在使用上述代码进行合并之后出现了如下错误 "failed_shards" : [ { "shard" : 0, "index" : "dgcrm-allinone", ...
elasticsearch中的内部对象无法按预期工作 这里的问题是elasticsearch(lucene)使用的库没有内部对象的概念,因此内部对象被扁平化为一个简单的字段名称和值列表。 我们的文档内部存储为: {"title": [ invest, money ],"body": [ as, investing, money, please, soon, start ],"tags": [ invest, money ],"pub...
问NestedScrollView中未显示RecyclerViewEN此外，还必须在RecyclerView的LayoutManager中使用setAutoMesureEnabled...