当我将内容从文件转换到我的对象时，java抛出java.lang.ClassCastException

Question

我尝试从文件“sinhvien.dat”读取数据，然后将其插入学生数组中。

我的代码:

private Student[] docFile() {
    Student[] std = null;
    FileInputStream f = null;
    ObjectInputStream inStream = null;
    try {
        f = new FileInputStream("student.dat");
        inStream = new ObjectInputStream(f);

        std = (Student[]) inStream.readObject();// this line throw error

    } catch (ClassNotFoundException e) {
        System.out.println("Class not found");
    } catch (IOException e) {
        System.out.println("Error Read file");
    } finally {
        if (inStream != null) {
            try {
                inStream.close();
            } catch (IOException ex) {
            }
        }
        if (f != null) {
            try {
                f.close();
            } catch (IOException ex) {
            }
        }
    }
    return std;
}

类(class)学生

public class Student implements Serializable { private String studName; Student(String name) { this.studName = name; } public Student() { } public String getStudName() { return studName; } public void setStudName(String studName) { this.studName = studName; } @Override public String toString() { return "Student Name :" + studName; } }

我不知道如何修复这个错误。抱歉英语不好:(

Answer 1

Exception in thread "Thread-3" java.lang.ClassCastException: btvn_l5.Student cannot be cast to [Lbtvn_l5.Student;

这意味着，您不能将单个学生对象转换为学生对象数组。我认为您序列化了 Student 并尝试反序列化 Student[]。 Th 前缀[L表示数组。

看看你的序列化器。