java - 有没有办法让当前类指向Java Serialized中刚刚读取的新对象？

Question

我正在尝试读取社交网络模拟的对象。读取方法使用 Java Serialized。代码如下所示:

public class SocialNetwork  implements Serializable{

// lots of fields

public SocialNetwork(){
//lots of inilization
} 
    public void writethisObject() throws IOException{
            ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("Simulation.bin"));
            objectOutputStream.writeObject(this);
        }

        public void readfromObject(File f) throws IOException, ClassNotFoundException{
            ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream(f));
            SocialNetwork newSocialNetwork = (SocialNetwork) objectInputStream.readObject();
            this = newSocialNetwork;
        }

}

但是，正如您所看到的，我试图通过使 this = newSocialNetwork.class 来使当前类指向我刚刚读取的对象。这给了我一个预期的错误。我可以通过将当前 SocialNetwork 类的每个字段都添加到 newSocialNetwork 来解决此问题。然而，我不想这样做，因为我的类(class)里有很多领域。而且会显得非常凌乱。我希望您已经了解我正在尝试做什么。

Answer 1

由于您无法在 Java 中重写此设置，并且您只想让类的一个实例使用 Singelton Pattern :

public class SocialNetwork  implements Serializable{
    // lots of fields

    private static SocialNetwork myself = new SocialNetwork();

    private SocialNetwork(){ // private constructor
        //lots of inilization
    }

    public static SocialNetwork getInstance() { 
        return myself; 
    }

    public void writethisObject() throws IOException{...}

    public void readfromObject(File f) throws IOException, ClassNotFoundException{
        ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream(f));
        myself = (SocialNetwork) objectInputStream.readObject();
    }

}