从对象流中读取对象,请在下面横线处填写代码完成此程序。 import java.util. *; import java. io. *; public class UnSerializeDate { date d = null; UnSerializeDate ( ) { try { FileInputStream f1 = new FileInputStream('date.ser'); d = (Date) s. readobject (); f1,close(); } catch (Exceptin e) { e. printStackTrace (); } } public static main(String args [] ) { System.out.println('The date read is: '+ a.d.toString()); } }