import java.lang.* ;

public class MyDate {
  private int day;
  private int month;
  private int year;

  public MyDate(int day, int month, int year) {
     this.day   = day;
     this.month = month;
     this.year  = year;
  }
  public MyDate(MyDate date) {
    this.day   = date.day;
    this.month = date.month;
    this.year  = date.year;
  }
}

class TestMyDate
{
    public static void main(String[] args)
    {
        MyDate day1=new MyDate(20,3,2009);
        MyDate day2=new MyDate(20,3,2009);
                System.out.println(day1.equals(day2));
                System.out.println(day1.hashCode());


        
    }
}

问题：day1.equals(day2)的返回值为什么是false?