Java：調用WriteUTF方法時出錯

Question

我在將2d用戶輸入數組寫入文本文件時遇到問題。我的代碼迄今（在保存方法，至少）是：

`public static void Save(String[][] EntryList) 
{ 
    try { 
     String[][] content = EntryList; 
     File file = new File("CBB.dat"); 

     // if file doesnt exists, then create it 
     if (!file.exists()) { 
      file.createNewFile(); 
     } 
     InputStream instream; 
     OutputStream outstream; 

     instream = new DataInputStream(new BufferedInputStream(new FileInputStream(file))); // buffers the data stream 
     outstream = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(file))); 
     FileWriter fw = new FileWriter(file.getAbsoluteFile(), true); 
     BufferedWriter writer = new BufferedWriter(fw); 
     for (int row = 0; row < EntryList.length; ++row) 
     { 
       outstream.writeUTF(EntryList[row][1]); 
       outstream.writeUTF(EntryList[row][2]); 
       outstream.writeUTF(EntryList[row][3]); 
       outstream.writeUTF(EntryList[row][4]); 
       outstream.writeUTF(EntryList[row][5]); 
      } 
       outstream.close(); 

      }catch (IOException e) { 
     e.printStackTrace(); 
    } 
     }` 

然而，當我嘗試編譯，我得到了錯誤的Java「無法找到符號 - 方法WriteUTF（字符串）」

Answer 1

顯然沒有爲java.io.OutputStream定義的writeUTF。

你或許應該申報outstream爲DataOutputStream參考：

DataOutputStream outstream; 

爲writeUTF是爲DataOutputStream定義的方法。