java 如何实现可序列化？
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How to implement Serializable?
提问by Mostafa M Awad
How should I implementthe Serializableinterface?
我implement的Serializable界面应该如何？
I have a classStudent, and need to be able to save it to disk. For my homework, I have to serialize five different Studentobjects and save them to file.
我有一个classStudent, 并且需要能够将它保存到磁盘。对于我的作业，我必须序列化五个不同的Student对象并将它们保存到文件中。
class Student {
String mFirstName;
String mSecondName;
String mPhoneNumber;
String mAddress;
String mCity;
Student(final String pFirstName, final String pSecondName, final String pPhoneNumber, final String pAddress, final String pCity){
this.mFirstName = pFirstName;
this.mSecondName = pSecondName;
this.mPhoneNumber = pPhoneNumber;
this.mAddress = pAddress;
this.mCity = pCity;
}}
I've tried using ObjectOutputStreamto serialize a Student, but it throws an error:
我试过用ObjectOutputStream序列化 a Student，但它抛出一个错误：
ObjectOutputStream lOutputStream = new ObjectOutputStream(new FileOutputStream("file.txt", true));
lOutputStream.write(new Student("foo","bar","555-1234","Flat 40","Liverpool"));
回答by DonatasD
The only thing you need to do is implement Serializable. The only thing you need to worry when implementing this interface is to make sure that all fields of such class, has implemented Serializable interface as well. In your case all fields are Strings and they already implement Serializable. Therefore, you only need to add implements Serializable. https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html
您唯一需要做的就是实现可序列化。实现此接口时，您唯一需要担心的是确保此类的所有字段也都实现了 Serializable 接口。在您的情况下，所有字段都是字符串，并且它们已经实现了可序列化。因此，您只需要添加implements Serializable。https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html
public class Student implements Serializable {
String first;
String second;
String phone;
String cityAddress;
String cityStreet;
public Student(String s1, String s2, String s3, String s4, String s5) {
first = s1;
second = s2;
phone = s3;
cityAddress = s4;
cityStreet = s5;
}
}
