[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。 importjava.util.*; importjava.io.*; publiclass UnSerializaDate{ Dated=null; UnSerializaDate(){ try{ FilelnputStreamf=newFilelnputStream("date.ser"); ObjectlnputStreams=newObjectlnputStream(f); f.close(); } catch(Exceptione){ e.printStackTrace(); } } public staticvoidmain(Stringargs[]){ publicstaticvoidmain(Stringargs[]){ UnSerializaDatea=newUnSerializaDate(); System.out.println("Thedatereadis:"+a.d.toString()); } }