您好，我有此代码，它要求用户输入视频和客户 ID 并将其添加到名为 hires 的数组列表中 完成后，我将如何将该 ArrayList 保存到文件中并退出此程序？
import java.util.ArrayList;
import java.util.Scanner;
public class Driver {
public static final int LISTCUSTOMERS = 1;
public static final int LISTVIDEOS = 2;
public static final int LISTHIRES = 3;
public static final int HIRESTATISTICS = 4;
public static final int HIREVIDEO = 5;
public static final int RETURNVIDEO = 6;
public static final int QUIT = 7;
public final static int DEFAULT = 0;
private String[] menuText;
private static final int MAXVIDEOS = 9;
private static final int MAXCUSTOMERS = 5;
static Scanner sc = new Scanner(System.in);
private int selection;
public int MAXLENGTH = 50;
public static ArrayList<Hire>HireList = new ArrayList<Hire>();
public static Video[]videos= new Video[MAXVIDEOS];
public static Customer [] customers = new Customer[MAXCUSTOMERS];
public static String [] options = {"","List Customers", "List Videos", "List Hires", "Hire Statistics", "Hire Video", "Return Video", "Quit"};
public static Driver myMenu = new Driver (options, sc);
public static boolean more = true;
public static int option = 0;
static Customer customer;
public static void main (String [] args){
initilisation();
runHireVideo();
}
public Driver (String[] menuText, Scanner sc){
this.menuText = menuText;
}
public int getMenuSelection(){
this.displayMenu();
this.selection = sc.nextInt();
if(this.selection < DEFAULT || this.menuText.length<this.selection){
System.out.println("Your selection was invalid - using default");
this.selection = DEFAULT;
}
return this.selection;
}
public void displayMenu(){
System.out.print("nMicroVideo Menu: n");
for (int index = 1; index < menuText.length; index++)
System.out.println(index + ". "+ menuText [index]);
System.out.print("Enter option: ");
}
public static void runHireVideo(){
while (more){
option = myMenu.getMenuSelection();
switch(option){
case LISTCUSTOMERS:
ListCustomers();
break;
case LISTVIDEOS:
ListVideos();
break;
case LISTHIRES:
ListHires();
break;
case HIRESTATISTICS:
HireStatistics();
break;
case HIREVIDEO:
HireVideo();
break;
case RETURNVIDEO:
ReturnVideo();
break;
default:
more = false;
System.out.println("Program Exited");
break;
}
}
}
public static void initilisation(){
videos[0]=new Video("140","The Matrix ", 7.50, 3);
videos[1]=new Video("141", "Terminator 2 ", 5.00, 3);
videos[2]=new Video("142", "Shrek ", 5.00, 10);
videos[3]=new Video("143", "The Castle ", 5.00, 1);
videos[4]=new Video("146", "Sound Of Music ", 1.00, 23);
videos[5]=new Video("147", "Planet Of The Apes", 5.00, 0);
videos[6]=new Video("148", "Mission Impossible", 1.00, 15);
videos[7]=new Video("150", "Bagdad by Night", 6.00, 5);
videos[8]=new Video("151", "Lord of the Rings 1", 5.00, 0);
customers [0]= new Customer("9902JI", "Innes ", 0,43484001);
customers [1]= new Customer("8906RH", "Herbert", 0,43484000);
customers [2]= new Customer("9012GT", "Turner ", 0,43480009);
customers [3]= new Customer("9012GS", "Sparke ", 0,43480007);
customers [4]= new Customer("9012MV", "Vallance", 0,43480008);
}
public static void ListCustomers(){
System.out.printf("%-6s %-5s %6sn", "Customer ID", "Customer Name", " Customer Phone Number");
for (int i=0;i<customers.length;i++){
System.out.println(customers[i]);
}
}
public static void ListVideos(){
System.out.printf("%-8s %-17s %6s %6sn", "Video ID", "VideoName", " Video Price Rate", " In Stock");
for (int i=0;i<videos.length;i++){
System.out.println(videos[i]);
}
}
public static void ListHires(){
System.out.printf("%s %s %s %s %s n","HireID", "Cust Name", "Video Name", "Days Hired", "Hire Cost");
for (Hire hire: HireList){
String Customer = customers[hire.getID(hire.getVideoID())].getCustomerName();
String videoID = videos[hire.getID(hire.getVideoID())].getTitle();
double DailyRate = videos[hire.getID(hire.getVideoID())].getRate()*hire.getDaysHired();
System.out.printf("%d %s %s %d %1.2f n",hire.getHireID(), Customer, videoID, hire.getDaysHired(), DailyRate);
}
}
public static void HireStatistics(){
System.out.printf("%s %s %sn", "Video ID", "Video Name", "Days Hired");
for (Hire hire: HireList){
String videoID = videos[hire.getID(hire.getVideoID())].getTitle();
System.out.printf("%s %s %d n",hire.getVideoID(), videoID, hire.getDaysHired());
}
}
public static void HireVideo(){
int count =0;
while (count == 0){
int hireID = 1000+ HireList.size()+1;
System.out.println("Enter Customer ID");
String customerID = "9902JI";
System.out.println("Enter Video ID");
String videoID = "140";
System.out.println("Enter Days Hired");
int daysHired = 4;
System.out.println("Enter Another Hire [Y/N]?");
String Yes = sc.next();
if(Yes.equals("y")){
count = 0;
}
else if (Yes.equals("n")){
count = 1;
}
HireList.add(new Hire(hireID,customerID, videoID, daysHired, 0));
}
}
public static void ReturnVideo(){
System.out.println("Enter Customer ID");
String customerID = "9902JI";
System.out.println("Enter Video ID");
String videoID = "140";
for (int i = 0; i < HireList.size();i++){
if (HireList.get(i).getCustomerID().equals(customerID)){
HireList.remove(i);
}
}
for (int ii = 0; ii < HireList.size();ii++){
if (HireList.get(ii).getVideoID().equals(videoID)){
HireList.remove(ii);
}
}
System.out.println("Removed " + customerID );
}
}
如前所述，最简单的方法是将每个成员保存在文本文件中，然后使用 Scanner 对象 （http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html） 将它们读回。
如果您关心如何写入文本文件，我建议您阅读本文：http://www.mkyong.com/java/how-to-write-to-file-in-java-bufferedwriter-example/这解释了如何使用文件编写器对象。
另一种选择是让 Driver 实现可序列化接口，该接口允许您将整个 Driver 对象存储在一系列字节中，但这稍微复杂一些。可以在此处找到有关序列化的体面教程：http://www.tutorialspoint.com/java/java_serialization.htm