calendar

상단에 
import java.util.Calendar; 추가
 
int year; 
int month; 
 
System.out.print("연도 = "); 
year = sc.nextInt(); 
 
System.out.print("월 = "); 
month = sc.nextInt(); 
 
Calendar cal = Calendar.getInstance(); // Calendar 선언 
 
// 년 월 일 달력 선언 
cal.set(Calendar.YEAR, year); 
cal.set(Calendar.MONTH, month - 1);  
cal.set(Calendar.DATE, 1); // 1일 부터 시작 
 
int startDay = cal.get(Calendar.DAY_OF_WEEK); 
int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH); 
int day = 1; 
 
System.out.println(year + "년 " + month + "월"); 
System.out.println("====================================================="); 
 
String week_day = "일월화수목금토"; 
 
for (int i = 0; i < week_day.length(); i++) { 
char c = week_day.charAt(i); 
System.out.print(c + "\t"); 
} 
System.out.println(); 
 
System.out.println("====================================================="); 
 
// 위쪽 빈칸 
for (int i = 1; i < startDay; i++) { 
System.out.print("*" + "\t"); 
} 
 
// 날짜 
for (int i = 0; i < lastDay; i++) { 
System.out.print(day + "\t"); 
 
if((day + startDay - 1) % 7 == 0) { 
System.out.println(); 
} 
 
day++; 
} 
 
// 밑 빈칸 
for (int i = 0; i < (7 - (startDay + lastDay - 1) % 7); i++) { 
System.out.print("*" + "\t"); 
} 
System.out.println(); 
 
System.out.println("====================================================="); 
 
}
 
 
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import java.util.Calendar; 
import java.util.GregorianCalendar; 
 
public class myClass { 
 
public static void main(String[] args) { 
 
// Calendar == 달력 
// Calendar cal = new GregorianCalendar(); 
 
Calendar cal = Calendar.getInstance(); 
 
// 취득 get 
int year = cal.get(Calendar.YEAR); 
int month = cal.get(Calendar.MONTH) + 1; 
int day = cal.get(Calendar.DATE); 
 
System.out.println(year + "년 " + month + "월 " + day + "일"); 
 
// 설정 set 
/* 
cal.set(Calendar.YEAR, 2019); 
cal.set(Calendar.MONTH, Calendar.JANUARY); 
cal.set(Calendar.DATE, 23); 

year = cal.get(Calendar.YEAR); 
month = cal.get(Calendar.MONTH) + 1; 
day = cal.get(Calendar.DATE); 

System.out.println(year + "년 " + month + "월 " + day + "일"); 
*/ 
 
String ampm = cal.get(Calendar.AM_PM)==0?"오전":"오후"; 
System.out.println("ampm = " + ampm); 
 
// 요일 
int weekDay = cal.get(Calendar.DAY_OF_WEEK);  // 1 ~ 7 
System.out.println("weekDay = " + weekDay); 
 
switch (weekDay) { 
case 1: 
System.out.println("일요일"); 
break; 
case 2: 
System.out.println("월요일"); 
break; 
case 3: 
System.out.println("화요일"); 
break; 
case 4: 
System.out.println("수요일"); 
break; 
case 5: 
System.out.println("목요일"); 
break; 
case 6: 
System.out.println("금요일"); 
break; 
case 7: 
System.out.println("토요일"); 
break; 
} 
 
cal.set(Calendar.YEAR, 2020); 
cal.set(Calendar.MONTH, 2 - 1);  
// 지정한 달의 마지막 날짜 == 28, 29, 30, 31 
int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH); 
System.out.println("lastDay = " + lastDay); 
 
 
// 연월일을 설정하면 달력의 빈칸이 몇개있는지 
year = 2018; 
month = 7; 
day = 1; 
 
cal.set(Calendar.YEAR, year); 
cal.set(Calendar.MONTH, month - 1); 
cal.set(Calendar.DATE, day); 
 
// 요일 
weekDay = cal.get(Calendar.DAY_OF_WEEK); // 1 ~ 7 
 
int _day = (weekDay - 1) % 7; 
System.out.println(month + "월의 윗쪽의 빈칸 수 = " + _day); 
 
lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH); 
cal.set(Calendar.DATE, lastDay); 
 
// 요일 
weekDay = cal.get(Calendar.DAY_OF_WEEK);  
System.out.println("weekDay = " + weekDay); 
 
int _lastday = 7 - weekDay; 
System.out.println("이 달의 밑쪽의 빈칸 수 = " + _lastday); 
 
} 
 
}