【发布时间】：2018-06-24 12:04:05
【问题描述】：
我将我的类中的一个对象写入二进制文件，现在我只想读回对象数组。但我得到了一个错误。
我的问题是我无法将文件读入对象“aaa”。我想将它读入一个名为“aaa”的数组对象。下面是我得到的运行时异常。但是代码有意义没有错误。 read.object 返回一个对象类，我所做的只是将其转换为 (Customer[])。但我在下面得到了这个运行时错误。
这是我的代码
Customer[] customer = new Customer[100];
Customer[] aaa = new Customer[100];
try{
file2 = new java.io.FileInputStream("Appointments.bin");
object2 = new java.io.ObjectInputStream(file2);
aaa = (Customer[]) object2.readObject(); <--- I think this is where the error occurs
for(Customer ddd : aaa)
System.out.print(ddd);
object2.close();
file2.close();
} catch(java.io.FileNotFoundException a){
System.out.print("Appointments.bin File Not Found , Please Contact The Developer to fix this issue. Thank you.\n\n");
System.exit(-1);
} catch(java.io.IOException b){
} catch(java.lang.ClassNotFoundException c){
System.out.print("dsada");
}
我的人类班级代码
public abstract class Human implements java.io.Serializable{
protected String firstName , lastName;
protected java.util.Date dateCreated = new java.util.Date();
public Human(){
}
public Human(String firstName , String lastName){
this.firstName = firstName;
this.lastName = lastName;
}
public void setFirstName(String firstName){
this.firstName = firstName;
}
public void setLastName(String lastName){
this.lastName = lastName;
}
public String getFirstName(){
return firstName;
}
public String getLastName(){
return lastName;
}
public String getFullName(){
return firstName + " " + lastName + "\n";
}
@Override
public String toString(){
return "First Name = " + firstName + "\nLast Name = " + lastName + "\nDate Created = " + dateCreated.toString() + "\n";
}
public abstract String getID();
}
我的客户类别代码
public class Customer extends Human implements java.io.Serializable {
private int code = 1000;
protected String customerID , day , time , service , carNo;
public Customer(){
}
public Customer(String firstName , String lastName , String service , String time , String day , String carNo){
this.firstName = firstName;
this.lastName = lastName;
this.service = service;
this.time = time;
this.day = day;
this.carNo = carNo;
code++;
customerID = "C" + code;
}
public String getService(){
return service;
}
public String getTime(){
return time;
}
public String getDay(){
return day;
}
public String getCarNo(){
return carNo;
}
@Override
public String getID(){
return customerID;
}
public void setService(String service){
this.service = service;
}
public void setTime(String time){
this.time = time;
}
public void setDay(String day){
this.day = day;
}
public void setCarNo(String carNo){
this.carNo = carNo;
}
private void setID(String customerID){
this.customerID = customerID;
}
@Override
public String toString(){
return super.toString() + "CustomerID = " + customerID + "\n";
}
}
客户注册的完整代码。它没有完成我只是围绕读写对象功能进行测试。所以是的，其中一些没有意义并且没有组织。
public static void customerRegistration(){
java.io.FileOutputStream file;
java.io.FileInputStream file2;
java.io.ObjectOutputStream object;
java.io.ObjectInputStream object2;
Validation validation = new Validation();
Customer[] customer = new Customer[100];
Scanner input = new Scanner(System.in);
String string;
int i = 0 , choice = 0, ww = 1;
boolean value , lol = false , exception = false;
ExceptionHandler handleEx = new ExceptionHandler();
int year , day , month;
Calendar date = Calendar.getInstance();
date.setLenient(false); // is a method that will validate the date and throws an exception if its out of range
do{
try{
file2 = new java.io.FileInputStream("Appointments.bin");
object2 = new java.io.ObjectInputStream(file2);
Customer[] aaa = (Customer[]) object2.readObject();
for(Customer ddd : aaa)
System.out.print(ddd);
object2.close();
file2.close();
} catch(java.io.FileNotFoundException a){
System.out.print("Appointments.bin File Not Found , Please Contact The Developer to fix this issue. Thank you.\n\n");
System.exit(-1);
} catch(java.io.IOException b){
} catch(java.lang.ClassNotFoundException c){
System.out.print("dsada");
}
customer[i] = new Customer();
do{
System.out.print("Enter First Name : ");
customer[i].setFirstName(input.nextLine());
value = validation.validateName(customer[i].getFirstName());
} while (value);
do{
System.out.print("Enter Last Name : ");
customer[i].setLastName(input.nextLine());
value = validation.validateName(customer[i].getLastName());
} while(value);
do{
System.out.printf("\n\n%-20s %-20s %-20s\n\n" ,"Services" , "Time Available" , "Days Available" );
System.out.printf("%-20s %-20s \n%-20s %-20s %-20s\n%-20s %-20s %-20s\n%-20s %-20s %-20s\n\n\n", "Repair" , "9.00am - 10.00am" , "Repaint" , "11.00am - 12.00pm" , "Monday - Sunday" , "Wax & Polish" , "1.00pm - 2.00pm" , "Monday - Sunday" , "Maintenance Service" , "3.00pm - 4.00pm" , "Monday - Sunday");
System.out.print("Enter A service based on numbers Ex (Repair = 1 , Repaint = 2 and so on) :");
choice = handleEx.handle(input);
input.nextLine(); // reads the new line character left by input.nexInt() in the class method.
if(choice < 1 || choice > 4)
System.out.print("\n\nPlease Enter a choice within (1-4) Range. Thank you.\n\n");
}while(choice < 1 || choice > 4);
switch(choice){
case 1:
customer[i].setService("Repair");
break;
case 2:
customer[i].setService("Repaint");
break;
case 3:
customer[i].setService("Wax & Polish");
break;
default:
customer[i].setService("Maintenance Service");
}
do{
System.out.print("Enter a time for appointment (X:XX) Where X represents a digit along with a colon : ");
if(customer[i].getService().equalsIgnoreCase("Repair")){
customer[i].setTime(input.nextLine()+"am");
if (customer[i].getTime().matches("(9):[0-5][0-9]am"))
value = false;
else{
value = true;
System.out.print("\n\nThis time is not available for this service. Please re-enter. Thank you.\n\n");
}
}
else if(customer[i].getService().equalsIgnoreCase("Repaint")){
customer[i].setTime(input.nextLine()+"am");
if (customer[i].getTime().matches("(11):[0-5][0-9]am"))
value = false;
else{
value = true;
System.out.print("\n\nThis time is not available for this service. Please re-enter. Thank you.\n\n");
}
}
else if(customer[i].getService().equalsIgnoreCase("Wax & Polish")){
customer[i].setTime(input.nextLine()+"am");
if (customer[i].getTime().matches("(1):[0-5][0-9]am"))
value = false;
else{
value = true;
System.out.print("\n\nThis time is not available for this service. Please re-enter. Thank you.\n\n");
}
}
else {
customer[i].setTime(input.nextLine()+"am");
if (customer[i].getTime().matches("(3):[0-5][0-9]am"))
value = false;
else{
value = true;
System.out.print("\n\nThis time is not available for this service. Please re-enter. Thank you.\n\n");
}
}
} while(value);
System.out.print("Enter a year : ");
year = handleEx.handle(input);
do{
System.out.print("Enter a month : ");
month = handleEx.handle(input);
month -= 1;
if(month < 1 || month > 12)
System.out.print("\n\nInvalid Date. Please re-enter. Thank you\n\n");
}while(month < 1 || month > 31);
do{
System.out.print("Enter a day : ");
day = handleEx.handle(input);
input.nextLine();
date.set(year, month, day);
value = handleEx.handle(date);
} while(value);
customer[i].setDay(Calendar.DAY_OF_MONTH + "-" + Calendar.MONTH + "-" + Calendar.YEAR);
do{
System.out.print("Please Enter Car Plate Number : ");
customer[i].setCarNo(input.nextLine().toUpperCase());
value = validation.validateCar(customer[i].getCarNo());
}while(value);
string = input.nextLine();
i++;
} while(string.equalsIgnoreCase("Y"));
try{
file = new java.io.FileOutputStream("Appointments.bin" , true);
object = new java.io.ObjectOutputStream(file);
for(Customer s : customer)
object.writeObject(s);
file.close();
object.close();
System.out.print("\n\nRecord Successfully Stored!\n\n");
} catch(java.io.FileNotFoundException a){
System.out.print("Appointments.bin File Not Found , Please Contact The Developer to fix this issue. Thank you.\n\n");
System.exit(-1);
} catch(java.io.IOException b){
System.out.print("IOException has occured. There might something wrong with the Appointmentss.bin file. Please Contact The Developer to fix this issue. Thank you.\n\n");
}
}
}
【问题讨论】：
-
CustomerRegistration在哪里？好像不见了。 -
已编辑.@kabanus
-
@kabanus 抱歉，做了一些改动。
-
线程“main”java.lang.ClassCastException 中的异常：Assignment.Customer 无法转换为 [LAssignment.Customer;
-
你没有听到别人告诉你的话。仅仅重复你所做的事情并不能说明你的理解。如果你不听而不听别人告诉你的话，在这里发帖就是浪费大家的时间。
标签： java serialization classcastexception