这是代码。我必须使用 Date 类并对其进行扩展以创建 ExtendedDate。无论如何,我不应该更改 Date 类。我非常感谢您能提供的任何帮助。我对如何解决这个问题一无所知
public static void main(String[] args) {
/* Trying to create a date with month = 3, date = 40, year = 2010. Objective to is throw an error/exception - "Date can't be created" */
ExtendedDate Dt1 = new ExtendedDate(03,40,2010);
System.out.println(Dt1.getDay());
//I don't want this statement to be executed because 40 is not valid. But it's printing "1" which is the default value for the default constructor
}
class ExtendedDate extends Date {
// Default constructor
// Data members are set according to super's defaults
ExtendedDate() {
super();
}
// Constructor that accepts parameters
public ExtendedDate(int month, int day, int year) {
setDate(month, day, year);
}
@Override
public void setDate(int monthInt, int dayInt, int yearInt) {
if (isValidDate(monthInt, dayInt, yearInt))
//isValidDate code is working perfectly fine.
{
super.setDate(monthInt, dayInt, yearInt);
}
else {
System.out.println("Wrong Date");
}
}
这是日期类
public class Date {
private int month; // instance variable for value of the date’s month
private int day; // instance variable for value of the date’s day
private int year; // instance variable for the value of the dates
// Default constructor: set the instance variables to default values: month = 1; day = 1; year = 1900;
public Date() {
month = 1;
day = 1;
year = 1900;
}
// Constructor to set the date
// The instance variables month, day, and year are set according to received parameters.
public Date(int month, int day, int year) {
this.month = month;
this.day = day;
this.year = year;
}
public void setDate(int month, int day, int year)
{
this.month = month;
this.day = day;
this.year = year;
}
public int getMonth()
{
return month;
}
public int getDay() {
return day;
}
public int getYear() {
return year;
}