參考 - P102~P103

1. 目標

生成一個日歷,格式如下圖所示。

ps: 當前的天數需要標記為*

2. 核心

對日歷的變量

import java.time.*;
public class CalendarTest{public static void main(String[] args) {LocalDate date = LocalDate.now();	// 獲取當前日期int month = date.getMonthValue();	// 獲取當前月份int today = date.getDayOfMonth();   // 獲取當前的天數date = date.minusDays(today - 1);	// 將當前日期設置為月初while(date.getMonthValue() == month) {		// 只要是當月就輸出,否則跳出循環System.out.printf("%3d", date.getDayOfMonth());date = date.plusDays(1);}}
}

3. 實現

在核心部分實現了日歷的循環打印,接下來只需要補全表頭、當前日期和換行即可.

import java.time.*;public class CalendarTest{public static void main(String[] args) {LocalDate date = LocalDate.now();int month = date.getMonthValue();int today = date.getDayOfMonth();date = date.minusDays(today - 1);       // 設置為本月的開頭DayOfWeek  weekday = date.getDayOfWeek();     // 獲取星期幾int value = weekday.getValue();     // 將星期幾兌換成對應的數字System.out.println("Mon Tue Wed Thu Fri Sat Sun");  // 日歷頭for(int i = 1; i < value; i++) {    // 打印對應的空格System.out.print("    ");}while(date.getMonthValue() == month) {System.out.printf("%3d", date.getDayOfMonth());     // 獲取當前多少號if(date.getDayOfMonth() == today) {System.out.print("*");} else {System.out.print(" ");}date = date.plusDays(1);if(date.getDayOfWeek().getValue() == 1){System.out.println();}}if (date.getDayOfWeek().getValue() != 1) System.out.println();}
}