小编Ple*_*her的帖子

我是一名学习我的文件IO技能的学生,我遇到了使用ObjectInputStream从文件中读取对象的问题.代码一直抛出一个InvalidClassException,我无法找到代码是如何在线投掷或通过反复试验.这是我的代码:

import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class ReadFromFile {
String filename;
List<Object> os;

public ReadFromFile(String filename) {
    this.filename = filename;
    os = new ArrayList<>();
}

public Object[] readObject() {
    try {
        FileInputStream fis = new FileInputStream(filename);
        ObjectInputStream ois = new ObjectInputStream(fis);
        System.out.print("reading\n");
        while (true) {
            os.add(ois.readObject());
            System.out.print("read one\n");
        }
    } catch (EOFException e) {
        return os.toArray();
    } catch (FileNotFoundException e) {
        System.out.print("File not found\n");
        return os.toArray();
    } catch (ClassNotFoundException e) {
        System.out.print("Class not found\n");
        return os.toArray();
    } catch …