我正在为图书馆系统制作一个程序。用户可以将书放入库（ser文件）并保存。但现在我希望能够编辑用户刚输入的数据。
例如，我要求他们提供本书的ID，名称，作者和价格。我希望能够通过要求用户输入他们想要输入的书的ID来编辑这些字段中的任何一个，然后它们将再次在屏幕上逐个显示并要求用户输入字段数据再次。我使用switch语句来获取用户输入并从那里开始。我如何编辑已在.ser文件中输入的数据？
public static void main(String[] args) {
while (running) { // while running is set to true the while will run
System.out.println("Enter 0 to load a library"
+ "\nEnter 1 to save and quit"
+ "\nEnter 2 to list all books in library"
+ "\nEnter 3 to add book to library"
+ "\nEnter 4 to edit a book in the library");
int answer = userInput.nextInt(); // takes the answer and stores it in user input
switch (answer) {
case 0:
System.out.println("Enter file name to load"); // choose which library to load
fileName = userInput.next();
loadScript(fileName);
break;
case 1: // case to save and quit
saveAndQuit();
break;
case 2:
System.out.println(lib.toString());
break;
case 3:
addBook();
break;
case 4:
edit();
break;
} // close switch
} // end while
System.exit(0); // exits program once while loop is done
} // end main
还有另外两个类，一个是图书馆和一个书类，虽然我不认为你需要看到它们。这是我用来添加书籍的代码，我想你可以把它混合一点吗？
public static void addBook() { // this method will add a book to the library
int id;
double price;
String title, author;
System.out.print("\nEnter book id: ");
id = userInput.nextInt();
System.out.print("\nEnter book title(one word/use _ for space): ");
title = userInput.next();
System.out.print("\nEnter book author: ");
author = userInput.next();
System.out.print("\nEnter book price: ");
price = userInput.nextDouble();
Book b = new Book(id, title, author, price);
lib.addBook(b); // adds the book to the library
} // end addBook method