JAVA去重：contains 与 Set

一、字符去重

contains:

二、对象属性去重

Set：
for(Map map : list)
...
String workId = map.get("WORK_ID");
Set<String> workIds= new HashSet<>();
int woBefore = workIds.size();
workIds.add(workId);
int woAfter = workIds.size();
if (woAfter == (woBefore + 1)) 
...

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