日期打印程序
public class MyDate{private int year;
private int month;
private int day;
public MyDate（int year, int month, int day）{
this.year = year;
this.month = month;
this.day = day;
}
public MyDate nextDay（）{
int newDay = day + 1;
int newMonth = month;
int newYear = year;
if（newDay > 30）{
newMonth ++;
newDay = 1;
}
if（newMonth > 12）{
newYear ++;
newMonth = 1;
}
MyDate newDate =
new MyDate（newYear, newMonth, newDay）；
return newDate;
}
public int getYear（）{
return year;
}
public int getMonth（）{
return month;
}
public int getDay（）{
return day;
}
}
package ch04;
public class DateTest{
public static void main（String[] args）{
MyDate oldDate = new MyDate（2005, 12, 30）；
MyDate newDate = oldDate.nextDay（）；
System.out.println（newDate.getYear（））；
System.out.println（newDate.getMonth（））；
System.out.println（newDate.getDay（））；
}
}
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