如何通過有效使用迭代器或其他任何東西來改變我的輸出結構？

Question

我想重組下面的代碼

Map m=request.getParameterMap(); 
    Set s = m.entrySet(); 
    Iterator it = s.iterator(); 

    out.print("<h1> Your Input Based on MapParamters</h1><br><br>"); 
    while(it.hasNext()){ 

      Map.Entry<String,String[]> entry = (Map.Entry<String,String[]>)it.next(); 
      String key    = entry.getKey(); 
      String[] value   = entry.getValue(); 

      out.println(key + " : "); 
      if(value.length>1){  
        for (int i = 0; i < value.length; i++) { 
         out.println("<li>" + value[i].toString() + "</li>"); 
        } 
       }else 
         out.println(value[0].toString()+"<br><br>"); 

    } 

，輸出類似

ISBN : 
-1 
-2 
-3 
-4 

Title : 
-5 
-6 
-7 
-8 

Price : 
-9 
-10 
-11 
-12 



But I want the output like 

ISBN : 1 
Title : 5 
Price : 9 

ISBN : 2 
Title : 6 
Price : 10 

ISBN : 3 
Title : 7 
Price : 11 

ISBN : 4 
Title : 8 
Price : 12 

Answer 1

下面將做的伎倆

Map m=request.getParameterMap(); 
Set<String> keys = m.keySet(); 
ArrayList<String[]> valuesArr = new ArrayList<>(m.values()); 

out.print("<h1> Your Input Based on MapParamters</h1><br><br>"); 

int i = 0; 
for (int j = 0; j < keys.size(); j++) { 
    for (String key : keys) { 
     for (String value : Arrays.copyOfRange(valuesArr.get(i), j, valuesArr.get(i).length)) { 
      out.println(key + " : " + value + " "); 
      i++; 
      break; 
     } 
    } 
    i=0; 
    out.println("<br/>") 
} 

Check the output of my code in command line version.

Answer 2

你有兩個選擇。要麼改變輸入來擁有這樣的對象。或

1. 創建一個Java Pojo說參數
   2.雖然迭代循環根據您的要求填充此pojo。
   3.現在您可以按照自己想要的方式打印。

Answer 3

你可以試試這個：

Map m=request.getParameterMap(); 
Set s = m.keySet(); 
Iterator it = s.iterator(); 

System.out.print("<h1> Your Input Based on MapParamters</h1><br><br>"); 
ArrayList<String> outputStrs = new ArrayList<String>(); 

for(Object keyObj : s){ 
    String key = (String) keyObj; 
    String[] val = m.get(key); 
    for(int j=0;j<val.length; j++) 
    { 
     if(outputStrs.size() < (j+1)) 
      outputStrs.add(key+" : "+val[j]); 
     else 
     { 
      String existing = outputStrs.get(j); 
      existing+= " " + key+" : "+val[j]; 
      outputStrs.set(j, existing); 

     } 
    } 
} 
for(String outputStr: outputStrs) 
    System.out.println(outputStr +" <br> ");