public
class MyDate { private
int day = 8; private
int month = 8; private
int year = 2008; private
MyDate(int day, int month, int year){...} public
void print(){...} } public
class TestMyDate { public
static void main(String args[]) { //這個today變量就是一個引用類型的變量 MyDate
today = new MyDate(23, 7, 2008); } }