logon.java

《Thinking in Java 4th Edition》 Source Code

//: io/Logon.java
// Demonstrates the "transient" keyword.
import java.util.concurrent.*;
import java.io.*;
import java.util.*;
import static net.mindview.util.Print.*;

public class Logon implements Serializable {
  private Date date = new Date();
  private String username;
  private transient String password;
  public Logon(String name, String pwd) {
    username = name;
    password = pwd;
  }
  public String toString() {
    return "logon info: \n   username: " + username +
      "\n   date: " + date + "\n   password: " + password;
  }
  public static void main(String[] args) throws Exception {
    Logon a = new Logon("Hulk", "myLittlePony");
    print("logon a = " + a);
    ObjectOutputStream o = new ObjectOutputStream(
      new FileOutputStream("Logon.out"));
    o.writeObject(a);
    o.close();
    TimeUnit.SECONDS.sleep(1); // Delay
    // Now get them back:
    ObjectInputStream in = new ObjectInputStream(
      new FileInputStream("Logon.out"));
    print("Recovering object at " + new Date());
    a = (Logon)in.readObject();
    print("logon a = " + a);
  }
} /* Output: (Sample)
logon a = logon info:
   username: Hulk
   date: Sat Nov 19 15:03:26 MST 2005
   password: myLittlePony
Recovering object at Sat Nov 19 15:03:28 MST 2005
logon a = logon info:
   username: Hulk
   date: Sat Nov 19 15:03:26 MST 2005
   password: null
*///:~