public class MyDateTest{
public static void main(String args[]){
      int y1 = 2001;
      int y2 =y1;
      y1 = 1998;
      System.out.println("y2=" + y2);
      MyDate  md1;
      md1 = new MyDate();
      MyDate md2 = md1;
      md1.setYear(y2);
      System.out.println("year of md2=" + md2.getYear());
}
}