我不断收到 java.io.NotSerializableException: java.io.ObjectOutputStream
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I keep getting java.io.NotSerializableException: java.io.ObjectOutputStream
提问by Jeet Parekh
This is the code that I have been trying
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();
}
}
and this is the exception I get
这是我得到的例外
Exception in thread "main" java.io.NotSerializableException: java.io.ObjectOutputStream 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) at Savings.(Banking.java:22) at Banking.main(Banking.java:30)
线程“main”中的异常 java.io.NotSerializableException: 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) at Savings.(Banking.java:22) at Banking.main(Banking.java:30)
I also tried using savobj.accData.writeObj(savobj)from main(), but I still get the same exception. What should I do?
我也尝试使用savobj.accData.writeObj(savobj)from main()，但我仍然遇到相同的异常。我该怎么办？
采纳答案by Luiggi Mendoza
Only primitives and classes that implement Serializableinterface can be serialized. ObjectOutputStreamdoesn't implement this interface.
只有实现Serializable接口的原语和类才能被序列化。ObjectOutputStream不实现这个接口。
Quick solution: use the ObjectOutputStreamin the narrowest possible scope, declare it in the method where it's being used, not as a field in the class. Do similar with other utility classes like Scanner.
快速解决方案：ObjectOutputStream在尽可能窄的范围内使用 ，在使用它的方法中声明它，而不是作为类中的字段。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();
}
}
Another solution may be just marking these fields as transientso they won't be serialized/deserialized:
另一种解决方案可能只是标记这些字段，transient以便它们不会被序列化/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);
}
