Question

我正在寻找更好的算法来通过其键以表格格式打印LinkedHashMap。我在这里解释一下场景，

//hashmap goes like this
LinkedHashMap<String , ArrayList<String>> hash=new LinkedHashMap<String,ArrayList<String>>();

// put some values in some arraylist
ArrayList<String> value1=Arrays.asList("s1", "s2", "s3");
ArrayList<String> value2=Arrays.asList("s4", "s5", "s6");
ArrayList<String> value1=Arrays.asList("s7", "s8", "s9");

// put values in hashmap
hash.put("key1",value1);
hash.put("key2",value2);
hash.put("key3",value3);

现在，我希望在html表中输出应该是这样的。

key1 key2 key3

s1    s4   s7

s2    s5   s6

s3    s6   s9

这样做的好方法是什么？谢谢。

Answer 1

如果您使用 JSP 页面，请尝试此

LinkedHashMap的＆GT; hash = new LinkedHashMap＆gt;（）;

// put some values in some arraylist
ArrayList<String> value1=Arrays.asList("s1", "s2", "s3");
ArrayList<String> value2=Arrays.asList("s4", "s5", "s6"); 
ArrayList<String> value1=Arrays.asList("s7", "s8", "s9");

// put values in hashmap
hash.put("key1",value1);
hash.put("key2",value2);
hash.put("key3",value3);

<% 
  for(Entry<String, ArrayList<String>> en: hash.entrySet()) {
      %>
   <td> 
     <% en.getKey(); %>
   </td>
 <%  }
 %>
 </td>
  </tr>

您也可以使用JSTL标记执行此操作。

Answer 2

尝试，

 StringBuffer sb=new StringBuffer();
 sb.append("<tr>");
 sb.append("<td>" + hash.get("key1").get(0) + "</td>");
 sb.append("<td>" + hash.get("key2").get(0) + "</td>");
 sb.append("<td>" + hash.get("key3").get(0) + "</td>");
 sb.append("</tr>");

Answer 3

以下代码应该

public static void main(String[] args) {
        // hashmap goes like this
        LinkedHashMap<String, List<String>> hash = new LinkedHashMap<String, List<String>>();

        // put some values in some arraylist
        List<String> value1 = (List<String>) Arrays.asList("s1", "s2", "s3");
        List<String> value2 = (List<String>) Arrays.asList("s4", "s5", "s6");
        List<String> value3 = (List<String>) Arrays.asList("s7", "s8", "s9");

        // put values in hashmap
        hash.put("key1", value1);
        hash.put("key2", value2);
        hash.put("key3", value3);

        int count = 0;
        boolean exit = false;
        while (!exit) {
            for (String key : hash.keySet()) {
                String value = hash.get(key).get(count);
                System.out.printf("\t" + value);
            }
            System.out.printf("\n");
            count++;
            if (count == hash.get("key1").size()) {
                exit = true;
            }
        }

    }

以下是所需的输出：

s1  s4  s7
s2  s5  s8
s3  s6  s9

以表格格式打印LinkedHashMap

3 个答案: