5、序列化破坏单例模式原理解析及解决方案

    public static void main(String[] args) throws IOException {
        HungrySingleton instance = HungrySingleton.getInstance();
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("singleton_file"));
        oos.writeObject(instance);
        File file = new File("singleton_file");
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
        HungrySingleton newInstance = (HungrySingleton) ois.readObject();
        System.out.println(instance);
        System.out.println(newInstance);
        System.out.println(instance == newInstance);
    }

  public class HungrySingleton implements Serializable{

    private final static HungrySingleton hungrySingleton;

    static{
        hungrySingleton = new HungrySingleton();
    }
    private HungrySingleton(){
    }
    public static HungrySingleton getInstance(){
        return hungrySingleton;
    }

    private Object readResolve(){
        return hungrySingleton;
    }

}