为什么我的程序停止运行并且不返回错误？

Question

I put the declaration in the while loop, and the program would not running and also does not return any error. I suspect the while loop become an infinite loop.

                    try
                    {
                        while (true)
                        {
                            inputStream = new ObjectInputStream (new FileInputStream (fileName));
                            Ship copyObject = (Ship) inputStream.readObject();
                            String nameCompany = copyObject.getCompanyName();

                            if (compName.equalsIgnoreCase(nameCompany)){
                                listShipName += (copyObject.getShipName() + ", ");
                                numberOfShip ++;
                            }
                        }
                    }

                    catch (EOFException e)
                    {
                    }

                    catch (Exception e)
                    {
                    e.printStackTrace();
                    }

But if I put the declaration of input stream out of the while loop, the program runs successfully. Can someone explain why this happens?

                        try
                        {
                            inputStream = new ObjectInputStream (new FileInputStream (fileName));

                        }
                        catch (Exception e)
                        {
                            e.printStackTrace();
                        }
                        try
                        {
                            while (true)
                            {

                                Ship copyObject = (Ship) inputStream.readObject();
                                String nameCompany = copyObject.getCompanyName();

                                if (compName.equalsIgnoreCase(nameCompany)){
                                    listShipName += (copyObject.getShipName() + ", ");
                                    numberOfShip ++;
                                }
                            }
                        }

                        catch (EOFException e)
                        {
                        }

                        catch (Exception e)
                        {
                        e.printStackTrace();
                        }

Answer 1

You're reopening your file on every iteration through the loop, which means you are only ever reading the first object from the file. But you're reading the same object over and over again.

As well as opening your file only once, you really should try to detect the end of file without throwing an exception. As a matter of style, exceptions should be thrown when things go wrong, not as a matter of course.

Answer 2

现在，我意识到在每次迭代中，我都会重新打开输入流，因此循环不会到达文件的末尾，并且循环变为无限。