1 public class ObjectStreamDemo {
 2     public static void main(String[] args) throws Exception {
 3 
 4         File file = new File("obj.txt");
 5         //writeObject(file);
 6         readObject(file);
 7     }
 8 
 9     private static void readObject(File file) throws Exception {
10         ObjectInputStream in = new ObjectInputStream(new FileInputStream(file));
11         User user = (User) in.readObject();
12         System.out.println(user.getName());
13         in.close();
14     }
15 
16     private static void writeObject(File file) throws Exception {
17         ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(file));
18         out.writeObject(new User("wxd","123",21));
19         out.close();
20     }
21 }