如何在代碼中添加do while循環？

Question

如何添加do while循環，以便在遇到FileNotFoundException類時，通知我的用戶該文件不存在並為我的用戶提供輸入另一個文件名的機會？ 這就是我到目前為止所擁有的。 謝謝

 do
{
      // Get a file name from the user.
      fileName = JOptionPane.showInputDialog("Enter " +
                                "the name of a file:");

      // Attempt to open the file.
      try
      {
         file = new File(fileName);
         inputFile = new Scanner(file);
         JOptionPane.showMessageDialog(null,
                          "The file was found.");
      }
      catch (FileNotFoundException e)
      {
         JOptionPane.showMessageDialog(null,
                               "File not found.");
      }

///// while(flag+f)

      JOptionPane.showMessageDialog(null, "Done.");
      System.exit(0);
   }
}

Answer 1

嘗試這樣的事情......添加一個標記'ok'並做你做的事情，直到它成為現實。 比停止循環。

boolean ok = false;
 do
{
  // Get a file name from the user.
  fileName = JOptionPane.showInputDialog("Enter " +
                            "the name of a file:");

  // Attempt to open the file.
  try
  {
     file = new File(fileName);
     inputFile = new Scanner(file);
     JOptionPane.showMessageDialog(null,
                      "The file was found.");
 ok = true;
  }
  catch (FileNotFoundException e)
  {
     JOptionPane.showMessageDialog(null,
                           "File not found.");
  }

 while(ok == false);}

  JOptionPane.showMessageDialog(null, "Done.");
  System.exit(0);
}