分类：value合并Collectio

2021
08-23

java8 Stream list to Map key 重复 value合并到Collectio的操作

java8StreamlisttoMapkey重复value合并到Collectio关于把list转换成keyvalue的map有很多博客上都有实现，这里是一个把value放入到集合中去List<String>list=Lists.newArrayList("1","2","3","1");Map<String,List<String>>map=list.stream().collect(Collectors.toMap(key->key,value->Lists.newArrayList(value),(List<String>newValueList,List<String>oldVal... 继续阅读 >