[填空题] 从对象流中读取对象,请在画线处加入代码完成此程序 【10】 。 import java.util.*; import java.io.*; public class UnSerializeDate { Date d = null; UnSerializeDate() {try{ FileInputStream f = new FileInputStream("data.ser"); ______; d = (Date) s.readObject(); f.close();}catch(Exception e){ e.printStackTrace();} } public static void main(String args[ ]) {UnSerializeDate a = new UnSerializeDate();System.out.println("The date read is :"+a.d.toString()); } }