对象自定义类Arraylist

Question

我有一个数组列表，这是我创建的类的类型。我已经使用objectoutputstream将该数组列表写入文件。现在我已经把它作为一个对象读回来了，但是我怎么把它重新放回我的数组列表中？

//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(); 
      } 

类

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

如果它被保存为一个ArrayList，你可以读回这样的：

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

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