A．FileOutputStream foutStream=new FileoutputStream("Date.txt");
ObjectInputStream iStream=new ObjectInputStream(foutStream);
Date curDate=new Date();
oStream.writeObject((Date)curDate);
B．FileoutputStream foutStream=new FileOutputStream("Date.txt");
ObjectOutputStream oStream=new ObjectOutputStream(foutStream);
Date curDate=new Date();
oStream.writeObject((Date)curDate);
C．ObjectOutputStream oStream=new ObjectOutputStream("Date.txt");
Date curDate=new Date();
oStream.writeObject((Date)curDate);
D．FileOutputStream foutStream=new FileOutputStream("Date.txt");
PrintStream oStream=new PrintStream(foutStream);
Date curDate=new Date();
oStream.println(curDate);