date.java

《A first book of java》by Gary J.Bronson 北大出版社

import java.text.*;  // needed for formatting
public class Date
{
  // class variable declaration section

  private int month;
  private int day;
  private int year;
  

  // class method implementation section
 
  public Date(int mm, int dd, int yyyy) // constructor
  {
    month = mm;
    day = dd;
    year = yyyy;
  }
 
  public void setEqual(Date newdate)
  {

    day = newdate.day;       // assign the day
    month = newdate.month;   // assign the month
    year = newdate.year;     // assign the year
  }

  public void showdate()
  {
    DecimalFormat df = new DecimalFormat("00");
    
    System.out.print(df.format(month)
                       + '/' + df.format(day) + '/' 
                       + df.format(year % 100)); // extract the last 2 year digits
  }
}