Question

怎样把一个map中的keys取出来存到一个数组中

Answer 1

<String,String> unitMap=new HashMap<String,String>();
cstmt = conn.prepareCall("{call sp_YG_GetUnitIDsNames()}");
res=cstmt.executeQuery();
while(res.next()){
unitMap.put(res.

Answer 2

LinkedHashMap<String,String> columnMap = new LinkedHashMap<String,String>();

String[] columns = (String[])columnMap.keySet().toArray();