如何序列化对象的ArrayList？

Question

我想序列化Item的arraylist 但它不起作用....

我的Item类扩展了Stuff类并且有一些子类.

我的所有类都实现了Serilalizable.

我有这个部分:

try{
// Serialize data object to a file
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("MyData.ser"));
out.writeObject(myData);
out.close();

// Serialize data object to a byte array
ByteArrayOutputStream bos = new ByteArrayOutputStream() ;
out = new ObjectOutputStream(bos) ;
out.writeObject(myData);
out.close();

// Get the bytes of the serialized object
byte[] buf = bos.toByteArray();
} catch (IOException e) {
}

我的课程 :

public class Stuff implements Serializeable{
....
some protected fields
.
.
}

public class Item extends Stuff implements Serializable{
...
..
.
} and some subclasses of Item:

public class FirstItem extends Item implements Serializable{
...
}

public class SecondItem extends Item implements Serializable{
...
} ... I want to serialize an object contains ArrayList of <Item> that has objects of Item's subclasses (FirstItem,SecondItem,...)

我认为信息就足够了......

这只是一个小错误,现在工作正常......我很抱歉我的愚蠢问题.

谢谢您的回答.

Answer 1

您可以像这样序列化ArrayList类

public class MyData implements Serializable {

    private long id;
    private String title;
    private ArrayList<String> tags;
    ...

    public String getTitle() {
    }
}

并创建可序列化

    ArrayList<MyData> myData = new ArrayList<MyData>();

try{
    // Serialize data object to a file
    ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("MyData.ser"));
    out.writeObject(myData);
    out.close();

    // Serialize data object to a byte array
    ByteArrayOutputStream bos = new ByteArrayOutputStream() ;
    out = new ObjectOutputStream(bos) ;
    out.writeObject(myData);
    out.close();

    // Get the bytes of the serialized object
    byte[] buf = bos.toByteArray();
} catch (IOException e) {
}