所以代码实现很容易写: class Solution { public ListNode mergeTwoLists(ListNode l1, ListNode l2) { //新建链表 ListNode dummyHead = new ListNode(0); ListNode cur = dummyHead; while (l1 != null && l2 != null) { if (l1.val < l2.val) { cur.next = l1; cur = cur.next; l1 = l1....
title Merge Two Lists section Initialize Lists MergeLists --> Initialize Lists section Merge Lists MergeLists --> Merge Lists section Print Merged List MergeLists --> Print Merged List 结论 通过利用Java中的Stream API,我们可以高效地将两个List合并成一个。这种方法可以减少遍历的次数,提高效率。希望本...
Stream<Object> fmlist =lists.stream() .map(Map::entrySet) .flatMap(Set::stream); System.out.println("merged="+merged); }/** * 两个list《map》中的map合并为一个list《map》,新的list中的每个map包含了之前的两个listmap的key*/publicstaticvoidmergeTwoListmapToOneListmap(List<Map> list1,Li...
import com.google.common.collect.Lists; import lombok.extern.slf4j.Slf4j; import java.lang.reflect.Field; import java.util.*; import java.util.stream.Collectors...
Tip: There are more ways to merge lists using libraries like guava or Apache commons lang, but they all useaddAll()method only. So it’s better to use this method directly. 1.2. UsingStream.flatMap() Java 8 streams provide us with one-line solutions to most of the problems and at th...
public static void main(String[] args) { //将List<Map>变成一个mapmergeListmapToOnemap(null);//将两个List<Map>合并成一个List<Map>,“name”为map的keymergeTwoListmapToOneListmap(null,null,"name");//对List<Map>分组统计summaryGroup();}/** * 对List 进行分组合并,按某个相同的key进行合并...
//Streamresult = Stream.concat(list1.stream(), list2.stream()) .collect(Collectors.toList()); assertEquals(expected, result); 4.2 Guava Guava提供了将Iterable转化为List的方法,代码如下: //Guavaresult = Lists.newArrayList(Iterables.concat(list1, list2)); ...
过程大体相似,合并Stream,然后转化为List,代码如下: //Streamresult=Stream.concat(list1.stream(),list2.stream()).collect(Collectors.toList());assertEquals(expected,result); 4.2 Guava Guava提供了将Iterable转化为List的方法,代码如下: //Guavaresult=Lists.newArrayList(Iterables.concat(list1,list2));asser...
过程大体相似,合并Stream,然后转化为List,代码如下: //Streamresult=Stream.concat(list1.stream(),list2.stream()).collect(Collectors.toList());assertEquals(expected,result); 4.2 Guava Guava提供了将Iterable转化为List的方法,代码如下: //Guavaresult=Lists.newArrayList(Iterables.concat(list1,list2));asser...
List<User> userList = Lists.newArrayList(new User().setId("A").setName("张三"),new User().setId("A").setName("李四"),new User().setId("C").setName("王五"));Map<String, User> collect = userList.stream().collect(Collectors.toMap(User::getId, Function.identity()));System.out...