这是我一直在尝试的代码
import java.util.Scanner;
import java.io.*;
abstract class Account implements Serializable {
protected String accountHolderName;
protected long balance;
protected ObjectOutputStream accData;
Scanner input = new Scanner(System.in);
}
class Savings extends Account implements Serializable {
Savings() throws IOException {
System.out.print("enter your name: ");
accountHolderName = input.nextLine();
System.out.print("\n");
System.out.print("enter your balance: ");
balance = input.nextLong();
accData = new ObjectOutputStream(new FileOutputStream(accountHolderName + ".bin"));
accData.writeObject(this);
accData.close();
}
}
class Banking implements Serializable {
public static void main(String args[]) throws IOException {
Scanner input = new Scanner(System.in);
Savings savobj = new Savings();
}
}
这是我得到的例外
线程中的异常" main" java.io.NotSerializableException: java.io.ObjectOutputStream中 at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) at java.io.ObjectOutputStream.writeSerialData(Unknown Source) at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.writeObject(Unknown Source) 在储蓄。(Banking.java:22) 在Banking.main(Banking.java:30)
我也尝试使用savobj.accData.writeObj(savobj)
中的main(
,但我仍然得到相同的异常。我该怎么办?
答案 0 :(得分:5)
只能实现Serializable
接口的基元和类的序列化。 ObjectOutputStream
没有实现此界面。
快速解决方案:在尽可能最窄的范围内使用ObjectOutputStream
,在使用它的方法中声明它,而不是在类中的字段。与其他实用程序类(如Scanner
。
abstract class Account implements Serializable {
protected String accountHolderName;
protected long balance;
//protected ObjectOutputStream accData;
//Scanner input = new Scanner(System.in);
}
class Savings extends Account implements Serializable {
Savings() throws IOException {
Scanner input = new Scanner(System.in);
System.out.print("enter your name: ");
accountHolderName = input.nextLine();
System.out.print("\n");
System.out.print("enter your balance: ");
balance = input.nextLong();
ObjectOutputStream accData = new ObjectOutputStream(new FileOutputStream(accountHolderName + ".bin"));
accData.writeObject(this);
accData.close();
}
}
另一个解决方案可能只是将这些字段标记为transient
,因此无法对其进行序列化/反序列化:
abstract class Account implements Serializable {
protected String accountHolderName;
protected long balance;
protected transient ObjectOutputStream accData;
transient Scanner input = new Scanner(System.in);
}