反序列化操作时，抛出异常

Exception in thread "main" java.io.EOFException

at java.io.DataInputStream.readInt(DataInputStream.java:392)

at java.io.ObjectInputStream$BlockDataInputStream.readInt(ObjectInputStream.java:2830)

at java.io.ObjectInputStream.readInt(ObjectInputStream.java:972)

at com.imooc.io.Student.readObject(Student.java:51)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1058)

at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1900)

at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)

at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)

at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)

at com.imooc.io.ObjectSeriaDemo1.main(ObjectSeriaDemo1.java:23)