import java.util.Scanner; public class Main { private int Year; private int Month; private int Day; // 带有默认形参值的构造函数,默认值为0, 0, 0; Main() { Year = 0; Month = 0; Day = 0; } // 设置日期函数,从键盘输入年、月、日。 void setDate(int Year, int Month, int Day) { this.Year = Year; this.Month = Month; this.Day = Day; } // 输出日期...