import com.google.common.collect.Lists; import lombok.extern.slf4j.Slf4j; import java.lang.reflect.Field; import java.util.*; import java.util.stream.Collectors...
In this article, we explored how to find common values between two lists using Java Stream. By leveraging the filter operation along with streams, we can easily compare collections and extract the common elements. This approach provides a concise and efficient way to perform such tasks in Java ...
publicstaticList<Map<Object,Object>>compareListHitData(List<Map<Object,Object>>oneList,List<Map<Object,Object>>twoList,ObjectequalKeyName) { List<Map<Object,Object>>resultList=oneList.stream().map(map->twoList.stream() .filter(m->Objects.equals(m.get(equalKeyName),map.get(equalKeyName)))...
简介:Java8使用stream操作两个list根据某字段匹配再对其中一个list进行赋值 import com.google.common.collect.Lists;import lombok.extern.slf4j.Slf4j;import java.lang.reflect.Field;import java.util.*;import java.util.stream.Collectors;@Slf4jpublic class ListUtils {/*** lambda表达式对两个List进行循环,...
*/publicstaticList<Map<Object,Object>>compareListHitData(List<Map<Object,Object>>oneList,List<Map<Object,Object>>twoList,ObjectequalKeyName){List<Map<Object,Object>>resultList=oneList.stream().map(map->twoList.stream().filter(m->Objects.equals(m.get(equalKeyName),map.get(equalKeyName)))...
1.1. Sort then Compare The following Java program tests if two given lists are equal. To test equality, we need to sort both lists and compare both lists usingequals()method. TheList.equals()method returnstruefor two list instances if and only if: ...
publicstaticvoidmain(String[] args){// 创建流List<Integer> asList = Arrays.asList(1,2,3,4,5);Integerone=asList.stream().reduce(Integer::sum).get();System.out.println("one = "+ one);Integertwo=asList.stream().reduce(100, Integer::sum);System.out.println("two = "+ two);Integer...
stream() .sorted(Integer::compareTo).collect(Collectors.toList()); System.out.println("sortList:"+sortList); 运行结果: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 sortList:[10, 22, 39, 56, 78] 聚合操作 前面已经介绍了流的创建和转换,下面介绍流的聚合,聚合是指将流汇聚为一个值,...
stream() .sorted((e1, e2) -> Integer.compare(e1.getSalary().compareTo(e2.getSalary()), 0)) .collect(Collectors.toList()); System.out.println("按薪资排序输出员工信息:\n" + employeeList); 注意这里的toString方法,前面加了个换行符'\n',不然都在一行不便观察结果: @Override public String ...
sorted方法排序时，不给参数默认自然排序，数字按大小，字符串按字典序。要自定义排序可以传Comparator，比如list.stream().sorted((a,b)->b.compareTo(a))实现倒序。处理大数据量时注意排序性能，必要时先用limit限定范围。collect方法最常用的是把流转成集合。Collectors.toList()转列表，Collectors.toSet()转集合...