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package chapter13;

import java.util.Calendar;

import java.util.HashMap;

import java.util.Map;

import static java.lang.System.out;

/**

* 使用Calendar打印日历

*/

public class CalendarDemo {

public static void printCurrentMonth() {

Calendar calendar = Calendar.getInstance();

Map<Integer, String> weekStr = new HashMap<>();

weekStr.put(0, "日");

weekStr.put(1, "一");

weekStr.put(2, "二");

weekStr.put(3, "三");

weekStr.put(4, "四");

weekStr.put(5, "五");

weekStr.put(6, "六");

System.out.printf("%d-%d-%d 星期%s\n",

calendar.get(Calendar.YEAR),

calendar.get(Calendar.MONTH) + 1,

calendar.get(Calendar.DATE),

weekStr.get(calendar.get(Calendar.DAY_OF_WEEK)-1));

weekStr.values().forEach((val) -> out.print(val + "\t"));

out.println();

calendar.set(Calendar.DAY_OF_MONTH, 1);

int firstDayInMonth = calendar.get(Calendar.DAY_OF_WEEK) - 1;

int lastDate = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);

for (int i = 1; i <= lastDate; i++) {

calendar.add(Calendar.DAY_OF_MONTH, 1);

if (i == 1) {

for (int j = 0; j < firstDayInMonth; j++) {

System.out.print("\t");

}

}

out.print(i + "\t");

if (calendar.get(Calendar.DAY_OF_WEEK) == 1) {

out.println();

}

}

}

public static void main(String[] args) {

CalendarDemo.printCurrentMonth();

}

}