Question

如何添加do while循环，以便在遇到FileNotFoundException类时，通知用户该文件不存在，并为用户提供输入另一个文件名的机会？到目前为止，这就是我所拥有的。谢谢

 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

尝试类似这样的操作...添加一个标记“确定”，然后执行操作，直到变为真为止。比停止循环。

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);
}

如何在代码中添加do while循环？

1 个答案: