Java实战——银行管理系统_7.10_陌人莫言的博客

Date类：

//import SavingsAccount.Date;
public class Date{//日期类
		
		private int year;//年
		private int month=1;//月
		private int day;//日
		private int totalDays;//该日期是从公元元年1月1日开始的第几天
		final int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
		
		public Date(int year,int month,int day) {
			if (day <= 0 || day > getMaxDay()) {
				System.out.print("Invalid date: ");
				show();
				System.out.println();
				System.exit(1);
			}
			int years = year - 1;
			totalDays = years * 365 + years / 4 - years / 100 + years / 400
				+ DAYS_BEFORE_MONTH[month - 1] + day;
			if (isLeapYear() && month > 2) totalDays++;
		};
		
		public final int getYear(){
		    return year;
		}
		
		public final int getMonth(){
		    return month;
		}
		
		public final int getDay(){
		    return day;
		}
		
		public final void show() {
			System.out.print(getYear()+"-"+getMonth()+"-"+getDay());
		}
		
		public final boolean isLeapYear(){//判断当年是否为闰年
			return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
		}
		
		public final int distance(final Date date){
			return totalDays - date.totalDays;
		}
		
		public int getMaxDay() {
			if (isLeapYear() && month == 2)
				return 29;
			else
				return DAYS_BEFORE_MONTH[month]- DAYS_BEFORE_MONTH[month - 1];
		}
		
	}


//import SavingsAccount.Date;