java Map的遍历

List<String> Keys =new ArrayList<String>();
if(SheetData.size() > 0 ){
for(int row = 0;row<SheetData.size() ;row ++ ){
Iterator<Map.Entry<Integer, Object>> ExcelkoumokuId = SheetData.get(row).entrySet().iterator();
while (ExcelkoumokuId.hasNext()) {
Map.Entry<Integer, Object>  koumokuId = ExcelkoumokuId.next();
Keys.add(koumokuId.getValue().toString());
}
}

}