java - 如何制作自定义对象副本？ java

如何制作listObject的副本？

listObject的类：

static class listObject {
        ArrayList<String> diseases;
        ArrayList<String> images;

        static class guide {
            ArrayList<String> guideTitle;
            ArrayList<String> guideText;
            ArrayList<String> guideImage;
        }
    }

这是我的复制功能：

public static Object copy(Object orig) {
        Object obj = null;
        try {
            // Write the object out to a byte array
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream out = new ObjectOutputStream(bos);
            out.writeObject(orig);
            out.flush();
            out.close();

            // Make an input stream from the byte array and read
            // a copy of the object back in.
            ObjectInputStream in = new ObjectInputStream(
                    new ByteArrayInputStream(bos.toByteArray()));
            obj = in.readObject();
        }
        catch(IOException e) {
            e.printStackTrace();
        }
        catch(ClassNotFoundException cnfe) {
            cnfe.printStackTrace();
        }
        return obj;
    }

当我调用copy（）函数时，它返回null：

listObject list;
listObject _tempList = new listObject();
list = (listObject) copy( (Object) _tempList);

最佳答案

listObject应该实现Serializable。如下更改listObject。

class listObject implements Serializable{
ArrayList<String> diseases;
ArrayList<String> images;

static class guide {
    ArrayList<String> guideTitle;
    ArrayList<String> guideText;
    ArrayList<String> guideImage;
}
}