java - 反序列化ArrayList？

Question

我正在尝试将序列化和反序列化添加到我的应用程序中。我已经添加了序列化，使其成为文本文件。这个问题涉及 ArrayList。我正在浏览这个页面:http://www.vogella.com/articles/JavaSerialization/article.html当我看到这段代码时:

FileInputStream fis = null;
    ObjectInputStream in = null;
    try {
      fis = new FileInputStream(filename);
      in = new ObjectInputStream(fis);
      p = (Person) in.readObject();
      out.close();
    } catch (Exception ex) {
      ex.printStackTrace();
    }
    System.out.println(p);
  }

我对这一行感到困惑:

p = (Person) in.readObject();

创建 ArrayList 时如何使这一行成为 ArrayList 并不那么简单:

List<String> List = new ArrayList<String>();

感谢您提前提供的帮助!

Answer 1

我直接从您提供链接的网站获取代码，并将其修改为 ArrayList。你提到“创建ArrayList时如何使这一行成为ArrayList没那么简单”，我说创建ArrayList就是这么简单。

public static void main(String[] args) {
    String filename = "c:\\time.ser";
    ArrayList<String> p = new ArrayList<String>();
    p.add("String1");
    p.add("String2");

    // Save the object to file
    FileOutputStream fos = null;
    ObjectOutputStream out = null;
    try {
        fos = new FileOutputStream(filename);
        out = new ObjectOutputStream(fos);
        out.writeObject(p);

        out.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    // Read the object from file
    // Save the object to file
    FileInputStream fis = null;
    ObjectInputStream in = null;
    try {
        fis = new FileInputStream(filename);
        in = new ObjectInputStream(fis);
        p = (ArrayList<String>) in.readObject();
        out.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    System.out.println(p);
}

打印出[String1, String2]