如何从HashMap一对一地检索值（列表）

Question

我尝试从Excel迭代数据。首先，我将一个键中的值放在HashMap中。

这是我的代码段：

public class HashMapEx {

    public static void main(String[] args) throws Exception {

        FileInputStream fis = new FileInputStream("/path-to-excel");

        XSSFWorkbook wb = new XSSFWorkbook(fis);

        wb.close();

        XSSFSheet sheet = wb.getSheetAt(0);

        Iterator<Row> ri = sheet.rowIterator();

        int rowCount = sheet.getLastRowNum();

        Row re = ri.next();

        Map<String, List<String>> hs = new HashMap<String, List<String>>();

        ArrayList<String> al = new ArrayList<String>();

        if (re.getCell(0).getStringCellValue().equalsIgnoreCase("TestCases")) {

            for (int i = 0; i < rowCount; i++) {

                Row ro = ri.next();

                Iterator<Cell> cell = ro.cellIterator();

                if (cell.hasNext()) {

                    Cell ci = cell.next();

                    al.add(ci.getStringCellValue());

                }
            }

        }

        hs.put(re.getCell(0).getStringCellValue(), new ArrayList(Arrays.asList(al)));

        for (Map.Entry<String, List<String>> entry : hs.entrySet()) {

            System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());


        }
    }
}

输出：

Key = TestCases, Value = [[Login, Creation, Submission]]

现在，我想通过将键用作“ TestCases”来从哈希映射中一次检索值。这是我正在尝试的：

if(hs.containsKey("TestCases")) {

    for(int i=0;i<hs.values().size();i++) 
    System.out.println("value: " + hs.get(i)); 
}

如果对此有任何建议，请告诉我？预先感谢！