java 打印日历

最近在看java核心技术卷1，里面有一段打印日历的程序段，效果和linux的cal命令效果很像

不太熟悉java关于日期的类库，如果不会获取某一天是这个月的星期几的话，格式不太好控制

     public static void printCalendar() {LocalDate date = LocalDate.now();// 获得年份int year = date.getYear();// 获得这是第几个月int month = date.getMonthValue();System.out.printf("\t   %s %d\n", date.getMonth(), year);System.out.println("Mon Tue Wed Thu Fri Sat Sun");// 获得今天是这个月的第几天int today = date.getDayOfMonth();// 跳转回第一天开始遍历date = date.minusDays(today - 1);// 获得这个月第一天对应星期几int value = date.getDayOfWeek().getValue();// 打印空白for (int i = 1; i < value; i++) {System.out.printf("%4c", ' ');}// 开始遍历这个月的天数while (month == date.getMonthValue()) {DayOfWeek dayOfWeek = date.getDayOfWeek();int dayOfMonth = date.getDayOfMonth();// 如果是周一 换行if (dayOfWeek.getValue() == 1) {System.out.println();}// 特殊标记todayif (dayOfMonth == today) {System.out.printf("%3d%c", dayOfMonth, '*');} else {System.out.printf("%3d ", dayOfMonth);}date = date.plusDays(1);}}

运行效果

下面是书上的代码，更简洁一些

    public static void printCalendar2() {LocalDate date = LocalDate.now();int month = date.getMonthValue();int today = date.getDayOfMonth();date = date.minusDays(today - 1);DayOfWeek dayOfWeek = date.getDayOfWeek();int value = dayOfWeek.getValue();System.out.println("Mon Tue Wed Thu Fri Sat Sun");for (int i = 1; i < value; i++) {System.out.print("    ");}while (date.getMonthValue() == month) {System.out.printf("%3d", date.getDayOfMonth());if (date.getDayOfMonth() == today)System.out.print("*");elseSystem.out.print(" ");date = date.plusDays(1);if (date.getDayOfWeek().getValue() == 1) System.out.println();}if (date.getDayOfWeek().getValue() != 1) System.out.println();} 

效果

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