如何实现Serializable？

Question

我implement该怎么Serializable接口？

我有class Student,并且需要能够将其保存到磁盘.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;

}}

我已经尝试使用ObjectOutputStream序列化a Student,但它会抛出一个错误:

ObjectOutputStream lOutputStream = new ObjectOutputStream(new FileOutputStream("file.txt", true));
lOutputStream.write(new Student("foo","bar","555-1234","Flat 40","Liverpool"));

Answer 1

您唯一需要做的就是实现Serializable.实现此接口时唯一需要担心的是确保此类的所有字段都实现了Serializable接口.在您的情况下,所有字段都是字符串,他们已经实现了Serializable.因此,您只需要添加实现Serializable.http://docs.oracle.com/javase/7/docs/api/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;
    }
}