在java中序列化数组列表

我正在用java创建一个酒店预订系统，但在保存和加载信息方面遇到了问题。我有一个名为Global的类，它存储所有数组：

import java.io.*;
import java.util.*;

public class Global implements Serializable {
    public static ArrayList<Guests> guests = new ArrayList<Guests>();
    public static ArrayList<Reservations> reservations = new ArrayList<Reservations>();
    public static ArrayList<Rooms> rooms = new ArrayList<Rooms>();
}   

仅供参考这是来宾课程的组成部分：

public class Guests implements Serializable {
    Integer id;
    String name, surname, email, mobile, passport;

    public Guests() {
    }

    public Guests(int id, String name, String surname, String mobile, String email, String passport) {
        this.id = id;
        this.name = name;
        this.surname = surname;
        this.mobile = mobile;
        this.email = email;
        this.passport = passport;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    public String getMobileNo() {
        return mobile;
    }

    public void setMobileNo(String mobile) {
        this.mobile = mobile;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassportNo() {
        return passport;
    }

    public void setPassportNo(String passport) {
        this.passport = passport;
    }

    public boolean equals(int guestId) {
        if (id == guestId) {
            return true;
        } else {
            return false;
        }        
    } 

    public Guests searchGuestById(int searchId) {
        for (int i = 0; i < Global.guests.size(); i++) {
            if (Global.guests.get(i).id == searchId) {
                return Global.guests.get(i);
            }
        }

        return null;
    }

    public void editGuest(Guests guestFound, uiMethods ui) {
        ui.guestId.setText(Integer.toString(Global.guests.indexOf(guestFound))); 
        ui.name.setText(guestFound.name);
        ui.surname.setText(guestFound.surname);
        ui.mobileNo.setText(guestFound.mobile);
        ui.email.setText(guestFound.email);
        ui.passportNo.setText(guestFound.passport);
    }

    public void deleteGuest(Guests guestFound) {
        Global.guests.remove(Global.guests.indexOf(guestFound));        
    }

    private boolean validation(uiMethods ui) {
        if (ui.name.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Name cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        if (ui.surname.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Surname cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        if (ui.mobileNo.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Mobile number cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        if (ui.email.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Email cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        if (ui.passportNo.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Passport number cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        return true;
    }

    public boolean detailsForm(uiMethods ui) {      
        if(this.validation(ui)) {
            Guests guest = new Guests();

            guest.id = Integer.parseInt(ui.guestId.getText());
            guest.name = ui.name.getText();
            guest.surname = ui.surname.getText();
            guest.mobile = ui.mobileNo.getText();
            guest.email = ui.email.getText();
            guest.passport = ui.passportNo.getText();

            Global.guests.add(guest.id, guest);

            return true;
        }

        return false;
    }
}

公共类来宾实现可序列化{
整数id；
字符串名称、姓氏、电子邮件、手机、护照；
公众来宾（）{
}
公共来宾（int-id、String-name、String-姓氏、String-mobile、String-email、String-passport）{
this.id=id；
this.name=名称；
this.姓氏=姓氏；
this.mobile=mobile；
this.email=电子邮件；
这个护照=护照；
}
公共int getId（）{
返回id；
}
公共无效集合id（内部id）{
this.id=id；
}
公共字符串getName（）{
返回名称；
}
公共void集合名（字符串名）{
this.name=名称；
}
公共字符串getNames（）{
返回姓氏；
}
public void setSurname（字符串姓氏）{
this.姓氏=姓氏；
}
公共字符串getMobileNo（）{
返回手机；
}
公共void setMobileNo（字符串移动）{
this.mobile=mobile；
}
公共字符串getEmail（）{
回复邮件；
}
公用电子邮件（字符串电子邮件）{
this.email=电子邮件；
}
公共字符串getPassportNo（）{
返回护照；
}
公共无效setPassportNo（字符串passport）{
这个护照=护照；
}
公共布尔等于（int guestId）{
如果（id==guestId）{
返回true；
}否则{
返回false；
}        
} 
公共来宾searchGuestById（int searchId）{
对于（int i=0；i

当我加载程序时，它会给我以下错误：java.io.notserializableexception

---

有没有办法解决这个问题？非常感谢你的帮助

一些班级

客人

，

房间

，

预订

不可

序列化

。 或者它包含对不可序列化的对象的引用。 您需要修复该问题，错误就会消失

---

NotSerializableException表示系统无法序列化特定的对象状态

确保完整序列化过程中的所有聚合对象都是可序列化的

阅读完整的日志并跟踪对象的名称

---

java.io.notserializableexception

表示要保存的对象不可序列化

您希望保存对象的ArrayList，因此其中一些对象不可序列化

您应该检查：

房间

，

预订

，

客人

是否可序列化

---

如果没有，他们必须实现

可序列化接口。
您的实体（如global和rooms）都实现了可序列化接口？预订和rooms是否可序列化？您尝试序列化的不是全局变量吗？而且，在这一点上有这样一个全球背景是非常反模式的。这真的不是OOP应该如何工作的。
if(clicker == save) {
    ToSave save = new ToSave();
    save.setGuests(Global.guests);
    save.setReservations(Global.reservations);
    save.setRooms(Global.rooms);
    save.save(filename);
}

if(clicker == load) {
   ToSave save = new ToSave();
   save.load(filename);
   Global.guests = save.getGuests();
   Global.reservations = save.getReservations();
   Global.rooms = save.getRooms();
}  

public class Guests implements Serializable {
    Integer id;
    String name, surname, email, mobile, passport;

    public Guests() {
    }

    public Guests(int id, String name, String surname, String mobile, String email, String passport) {
        this.id = id;
        this.name = name;
        this.surname = surname;
        this.mobile = mobile;
        this.email = email;
        this.passport = passport;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    public String getMobileNo() {
        return mobile;
    }

    public void setMobileNo(String mobile) {
        this.mobile = mobile;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassportNo() {
        return passport;
    }

    public void setPassportNo(String passport) {
        this.passport = passport;
    }

    public boolean equals(int guestId) {
        if (id == guestId) {
            return true;
        } else {
            return false;
        }        
    } 

    public Guests searchGuestById(int searchId) {
        for (int i = 0; i < Global.guests.size(); i++) {
            if (Global.guests.get(i).id == searchId) {
                return Global.guests.get(i);
            }
        }

        return null;
    }

    public void editGuest(Guests guestFound, uiMethods ui) {
        ui.guestId.setText(Integer.toString(Global.guests.indexOf(guestFound))); 
        ui.name.setText(guestFound.name);
        ui.surname.setText(guestFound.surname);
        ui.mobileNo.setText(guestFound.mobile);
        ui.email.setText(guestFound.email);
        ui.passportNo.setText(guestFound.passport);
    }

    public void deleteGuest(Guests guestFound) {
        Global.guests.remove(Global.guests.indexOf(guestFound));        
    }

    private boolean validation(uiMethods ui) {
        if (ui.name.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Name cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        if (ui.surname.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Surname cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        if (ui.mobileNo.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Mobile number cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        if (ui.email.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Email cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        if (ui.passportNo.getText().trim().length() == 0) {
            JOptionPane.showMessageDialog(ui, "Passport number cannot be empty", "Error", JOptionPane.ERROR_MESSAGE);
            return false;
        }

        return true;
    }

    public boolean detailsForm(uiMethods ui) {      
        if(this.validation(ui)) {
            Guests guest = new Guests();

            guest.id = Integer.parseInt(ui.guestId.getText());
            guest.name = ui.name.getText();
            guest.surname = ui.surname.getText();
            guest.mobile = ui.mobileNo.getText();
            guest.email = ui.email.getText();
            guest.passport = ui.passportNo.getText();

            Global.guests.add(guest.id, guest);

            return true;
        }

        return false;
    }
}