自定義類Arraylist的對象

Question

我有一個數組列表，它是我創建的類的類型。 我已經使用objectoutputstream將該數組列表寫入文件。 現在，我已將其讀回為一個對象，但是如何將其返回到我的arraylist中呢？

//Open external storage
        File root = android.os.Environment.getExternalStorageDirectory();
       //Get directory path
        File dir = new File(root.getAbsolutePath() + "/download");
        File file = new File(dir, "userAccounts.txt");

        try{
            FileInputStream fis = new FileInputStream(file);
            ObjectInputStream ois = new ObjectInputStream(fis);
            UserAccounts tempUser = (UserAccounts) ois.readObject();
            Global.getInstance().userArray.add(tempUser);
            ois.close();
            Toast.makeText(getApplicationContext(), Global.getInstance().userArray.get(0).aUsername, Toast.LENGTH_LONG).show();

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

類

package com.example.cg4project;

import java.io.Serializable;

public class UserAccounts implements Serializable{
    /**
     * 
     */

    public int aID;
    public String aUsername;
    public String aFirstName;
    public String aLastName;
    public String aemail;
v

Answer 1

如果將其存儲為ArrayList，則可以像這樣讀取它：

ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
ArrayList<UserAccounts> myArray = (ArrayList<UserAccounts>) ois.readObject();

Global.getInstance().userArray.clear();
Global.getInstance().userArray.addAll(myArray);