日历小程序
功能
- 查看当前日期所在月份的日历
- 输入年份和月份，显示指定年月的日历
- 实现日历的翻页功能
界面类
public class UI { public void u_1() { System.out.println("\t 日历小程序\n"); System.out.println("*"); System.out.println("*"); System.out.println(" "); System.out.println(" "); System.out.println(" 1.显示当前月 "); System.out.println(" "); System.out.println(" 2.查找指定月 "); System.out.println(" "); System.out.println(" 0.退出 "); System.out.println(" "); System.out.println(" "); System.out.println("*"); System.out.println("*"); System.out.println("*"); } }日历类
负责接收数据并生成日历 import java.util.Calendar; import com.lyf.date.MyDateOperation; / * 这是一个日历类 * 1.可以打印当前月的日历 * 2.可以根据输入参数，打印特定月份日历 * * @author lyf * @serial 1.0 * @since 1.0 */ public class MyCalendar {
private int year; private int month; private Calendar cal; / * 无参构造，默认当前月 */ public MyCalendar() { cal = Calendar.getInstance(); cal.set(Calendar.DAY_OF_MONTH, 1); this.setYear(this.cal.get(Calendar.YEAR)); this.setMonth(this.cal.get(Calendar.MONTH) + 1); } / * 有参构造，根据输入的年份和月份设置为对应月 * @param year 查找年份 * @param month 查找月份 */ public MyCalendar(int year, int month) { this.setYear(year + month / 12); this.setMonth(month); cal = Calendar.getInstance(); cal.set(this.year, this.month - 1, 1); } public int getYear() { return year; } public void setYear(int year) { this.year = year; } public int getMonth() { return month; } public void setMonth(int month) { this.month = month % 12; } / * 打印日历表 */ public void table() { MyDateOperation mdo = new MyDateOperation(); int maxDay = mdo.getMonthDays(this.cal.get(Calendar.YEAR), this.cal.get(Calendar.MONTH)); int begin = (cal.get(Calendar.DAY_OF_WEEK) + 6) % 7; int max = begin + maxDay; System.out.println("================== " + String.valueOf(this.cal.get(Calendar.YEAR)) + "年-" + String.valueOf(this.cal.get(Calendar.MONTH) + 1) + "月 ================="); System.out.println("\n日\t一\t二\t三\t四\t五\t六"); for (int i = 0; i < max; i++) { if (i % 7 == 0) { System.out.println(); } if (i >= begin) { System.out.print((i - begin + 1) + "\t"); } else { System.out.print("\t"); } } System.out.println(); } }日期时间操作类
import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; / * 这是一个日期时间操作类 * * @author lyf * @serial 1.0 * */ public class MyDateOperation {
/ * 返回日期相隔天数 * @param beginDate 开始日期 * @param endDate 结束日期 * @return int 相隔天数 */ public static int getTimeDistance(Date beginDate, Date endDate) { Calendar beginCalendar = Calendar.getInstance(); Calendar endCalendar = Calendar.getInstance(); beginCalendar.setTime(beginDate); endCalendar.setTime(endDate); long beginTime = beginCalendar.getTime().getTime(); long endTime = endCalendar.getTime().getTime(); int betweenDays = (int) ((endTime - beginTime) / (1000 * 60 * 60 * 24)); if (betweenDays < 0) { System.out.println("穿越了吧，兄弟！"); } else if (betweenDays == 0 && beginCalendar.get(Calendar.DAY_OF_MONTH) != endCalendar.get(Calendar.DAY_OF_MONTH)) { return betweenDays + 1; } return betweenDays; } / * 格式化输出当前日期 * @param date Date型日期参数 * @return String 格式化日期 */ public static String formatPrint(Date date) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss") ; return sdf.format(date) ; } / * 获得指定月份的总天数 * @param year * @param month * @return int 总天数 */ public static int getMonthDays(int year, int month) { Calendar a = Calendar.getInstance(); a.set(Calendar.YEAR, year); a.set(Calendar.MONTH, month); a.set(Calendar.DATE, 1);//把日期设置为当月第一天 a.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天 int maxDate = a.get(Calendar.DATE); a.add(Calendar.MARCH, -1);//日期回滚一天，也就是最后一天 return maxDate; } } 主程序类
实现各项功能，负责整个程序有序的执行 import java.util.InputMismatchException; import java.util.Scanner; / * 日历小程序 具备功能： 1.查询当前月日历 2.查询指定月日历 3.日历翻页 * * @author lyf * */ public class CalendarProgram {
Scanner input = new Scanner(System.in); private MyCalendar calendar = null ; private int year ; private int month ; / * 无参构造，默认当前月 */ public CalendarProgram() { calendar = new MyCalendar() ; this.setYear(calendar.getYear()); this.setMonth(calendar.getMonth()); } public int getYear() { return year; } public void setYear(int year) { this.year = year; } public int getMonth() { return month; } public void setMonth(int month) { this.month = month; } / * 查看指定月份日历 */ public void search() { System.out.print("请输入要查询年份: "); this.setYear(inputInt()); System.out.print("请输入要查询月份: "); this.setMonth(inputInt()); getTable(this.getYear(), this.getMonth()); formFeed() ; } / * 打印对应月份的日历 * @param year 年份 * @param month 月份 */ public void getTable(int year, int month) { calendar = new MyCalendar(year, month) ; calendar.table(); System.out.println(); } / * 打印本月日历 */ public void thisMonth() { calendar = new MyCalendar() ; calendar.table(); formFeed() ; } / * 实现日历的翻页功能 */ public void formFeed() { int ch = 0 ; do { System.out.println("0.返回 1.上个月 2.下个月 其它数字退出。"); ch = inputInt() ; switch(ch) { case 0: break ; case 1: if(this.getMonth() == 1) { this.setMonth(12); this.setYear(this.getYear() - 1); }else { this.setMonth(this.getMonth() -1); } break ; case 2: if(this.getMonth() == 12) { this.setMonth(1); this.setYear(this.getYear() + 1); }else { this.setMonth(this.getMonth() + 1); } break ; default: System.out.println("\n程序已退出，谢谢使用！"); System.exit(0); } getTable(this.getYear(), this.getMonth()); }while(ch != 0) ; } //整形输入检测 public int inputInt() { int num = 0 ; while(!input.hasNextInt()){ System.out.println("输入有误请重新输入！"); input.next(); } num = input.nextInt() ; return num ; } }客户端程序（main方法）
public class Run { public static void main(String[] args) { // TODO Auto-generated method stub UI ui = new UI() ; CalendarProgram cp = new CalendarProgram() ; Scanner input = new Scanner(System.in) ; int ch = 0 ; do { ui.u_1(); System.out.println("请输入所需功能对应的值："); ch = cp.inputInt() ; switch (ch) { case 0: break ; case 1: cp.thisMonth(); break ; case 2: cp.search(); break ; default: System.out.println("无此选项！"); break; } } while (ch != 0); System.out.println("\n程序已退出，谢谢使用！"); } }运行结果
