标签: java | 优X小宇宙

demo 未读

Map遍历方式

1. for-each + entrySet() for (Map.Entry<String, Integer> entry : map1.entrySet()) { System.out.print("key = " + entry.getKey()); System.out.p

java 2024-05-31

demo 未读

List<String> ids 按指定长度分组

List<String> ids = new ArrayList<>(); int fySize = 900; List<List<String>> idLists = Stream.iterate(0, i -> i + fySize)

java 2024-05-31

demo 未读

List<Obj>提取 List<Obj.id>

List<Obj> dbList = baseMapper.selectObj(stime); if(CollectionUtils.isNotEmpty(dbList )){ List<String> ids = dbList .stream() .

java 2024-05-31