1 public class Logg implements Serializable{
 2   
 3     private static String name;
 4     private transient String pwd;
 5     
 6     public void setName(String pwd){
 7            Logg.name=name;
 8     }
 9 
10     public void setPwd(String pwd){
11            this.pwd=pwd;
12     }
13 
14     
15     public String toString() {
16         return "name="+name+",pwd="+pwd;
17     }
18 }    

 1 ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("log.dat"));
 2 ObjectInputStream in = new ObjectInputStream(new FileInputStream("log.dat"));
 3 
 4 Logg logg = new Logg();
 5 logg.setName("test");
 6 logg.setPwd("111111");
 7 
 8 out.writeObject(logg);
 9 out.close();
10 Logg log = (Logg)in.readObject();
11 in.close();
12 System.out.println(log.toString());