定义一个可序列化的对象Student类，这个类实现了Serializable接口，类中的成员变量id，name，age，department都可以被序列化，方法不能序列化。通过对象输出流的writeObject()方法将Student对象保存到文件data.ser中，然后通过对象输入流的readObject()方法从文件data.ser中读出保存下来的Student对象，然后将Student对象的id和name输出到控制台。-Define a sequence of objects Student class that implements the Serializable interface, the class member variable id, name, age, department can be serialized, the method can not be serialized. Through the object output stream writeObject () method to save the file data.ser Student object, then the object input stream by readObject () method read from the file saved data.ser Student object, then the Student object id and name the output to the console.