填空题 下面程序段是从对象流中读取对象，请将程序补充完整。
import java. util.*；
import java. io.*;
public class UnSerializaDate
Date d=null;
UnSerializaDate()
try
FileInputStream f=new FileInputStream("date. ser");
ObjectInputStream s=new ObjectInputStream(f);
【13】
f. close();

catch(Exception e)
e. printStackTrace();


public static void main(String args[])
UnSerializaDate a=new UnSerializaDate();
System. out. println("The date read is:" +a.d.toString());