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[英]Casting Java ArrayList<Custom Class> to ArrayList<Object>
[英]Object to custom class Arraylist
我有一个数组列表,它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,我已将其读回为一个对象,但是如何将其返回到我的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();
}
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
如果将其存储为ArrayList,则可以像这样读取它:
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
ArrayList<UserAccounts> myArray = (ArrayList<UserAccounts>) ois.readObject();
Global.getInstance().userArray.clear();
Global.getInstance().userArray.addAll(myArray);
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