如何实现序列化?
How to implement Serializable?
我应该如何implement
Serializable
界面?
我有一个 class
Student
,需要能够将它保存到磁盘。对于我的家庭作业,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;
}}
我试过使用 ObjectOutputStream
序列化一个 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"));
您唯一需要做的就是实现 Serializable。实现这个接口时你唯一需要担心的是确保 class 的所有字段也实现了 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,你只需要添加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;
}
}
我应该如何implement
Serializable
界面?
我有一个 class
Student
,需要能够将它保存到磁盘。对于我的家庭作业,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;
}}
我试过使用 ObjectOutputStream
序列化一个 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"));
您唯一需要做的就是实现 Serializable。实现这个接口时你唯一需要担心的是确保 class 的所有字段也实现了 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,你只需要添加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;
}
}