改进的dos环境下的日历查询系统

import java.util.*; import java.util.Date; import java.util.Calendar; public class MyCalendar { private Scanner san = new Scanner(System.in); private Calendar now=Calendar.getInstance(); private Date today=new Date(); public void printTimeInfo() //显示当前时间和本月日历，如需查询其他日期，则显示所要查询的日期的日历 { System.out.println("当前时间是"+today.toString()); print(getCurrentyear(),getCurrentmonth()); consult(); } public int getCurrentyear() //获得当前的年份 { int year=now.get(Calendar.YEAR); return year; } public int getCurrentmonth() //获得当前的月份 { int month=now.get(Calendar.MONTH)+1; return month; } public int getCurrentday() //获得当前是哪一天 { int day=now.get(Calendar.DATE)+1; return day; } public int readYear() //键盘输入需要查询的年份 { int year; while (true) { try { System.out.print("\n请输入查询的年份(>=1970): "); year = Integer.parseInt(san.next()); if(year < 1970) { continue; } else { return (int)year; } }catch (Exception e) {continue;} } } public int readMonth() //键盘输入需要查询的月份 { int month; while (true) { try { System.out.print("\n请输入查询的月份(1-12): "); month = Integer.parseInt(san.next()); if(month <= 0 || month > 12) { continue; } else { return (int)month; } } catch (Exception e) {continue;} } } public int readDay(int year, int month) //键盘输入需要查询哪一天 { int day; while (true) { try { System.out.print("\n请输入查询的日子(1-"+getDays(year,month)+"): "); //这里键盘提示的输入天数范围可根据具体输入的年份、月份改变，以最大限度减少错误信息输入 day = Integer.parseInt(san.next()); if(day <= 0 || day > getDays(year, month)) { continue; } else { return day; } } catch (Exception e) {continue;} } } public int firstDayofMonth(int year,int month) //每个月的第一天是星期几 { Calendar firstday=Calendar.getInstance(); //新产生一个Calendar对象 firstday.set(year,month-1,1); //将该对象的时间设置为所要查询的那一年的那个月的第一天 int firstdayofweek=firstday.get(Calendar.DAY_OF_WEEK)-1; //得到指定时间所在月的第一天是星期几 return firstdayofweek; } public void print(int year, int month) //输出显示指定日期所在月的日历 { int day = getDays(year, month); System.out.println(year + "年" + month + "月的日历如下: "); System.out.println("星期日\t星期一\t星期二\t星期三\t星期四\t星期五\t星期六"); for(int i = 0; i <=day+firstDayofMonth(year,month)-1; i ++) { if(i<firstDayofMonth(year,month)) { System.out.print(" "+ "\t"); if(i%7==6) System.out.print("\n"); } else { int week=i-firstDayofMonth(year,month)+1; System.out.print(week+"\t"); if(i % 7 == 6 ) System.out.print("\n"); } } } public boolean isLeapYear(int year) //判断是否为闰年 { if(((year / 4 == 0) && (year/100 != 0) ) || (year/400 == 0) ) { return true; } else { return false; } } public int getDays(int year, int month) //判断某月应该有多少天 { int day=0; switch (month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: { day=31; break; } case 4: case 6: case 9: case 11: { day=30; break; } case 2:day = isLeapYear(year) ? 29 : 28; } return day; } public void consult() //询问是否要进行查询，并显示查询结果 { boolean condition=true; String state; while(condition) { System.out.print("\n是否要查询时间(Y/N): "); state= san.next(); if(state.equals("Y") || state.equals("y")) { int year = readYear(); int month = readMonth(); int day = readDay(year, month); print(year, month); } else break; } } public static void main(String[] args) { MyCalendar myc = new MyCalendar(); myc.printTimeInfo(); } }