回答編集履歴
3
バグじゃなかったですorz. Calendar定数置き換え不足修正
answer
CHANGED
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@@ -14,10 +14,10 @@
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14
14
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int year = scan.nextInt();
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15
15
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int month = scan.nextInt() - 1; //月は 0 始まりとする
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16
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17
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-
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17
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+
Calendar cal = Calendar.getInstance();
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18
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-
cal.set(
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18
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cal.set(YEAR, year);
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19
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-
cal.set(
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cal.set(MONTH, month);
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-
cal.set(
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20
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cal.set(DATE, 1);
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21
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System.out.println();
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System.out.println(year + "/" + (month+1) + (((java.util.GregorianCalendar)cal).isLeapYear(year)?"(うるう年)":"") );
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@@ -25,7 +25,7 @@
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25
25
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System.out.println("日 月 火 水 木 金 土");
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26
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System.out.println("---------------------");
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27
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28
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-
cal.add(
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28
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+
cal.add(DATE, SUNDAY-cal.get(DAY_OF_WEEK)); //1日が属する週の日曜日の日付. ex)2019/5/1→2019/4/28
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for (; cal.get(MONTH) <= month; cal.add(DATE, 1)) {
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System.out.printf(cal.get(MONTH)<month?" ":"%2d ", cal.get(DATE));
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31
31
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if (cal.get(DAY_OF_WEEK) == SATURDAY) System.out.println();
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2
週の始まりが前年だとうるう年判定に失敗するバグ対応
answer
CHANGED
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@@ -18,7 +18,6 @@
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18
18
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cal.set(Calendar.YEAR, year);
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19
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cal.set(Calendar.MONTH, month);
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20
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cal.set(Calendar.DATE, 1);
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21
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-
cal.add(Calendar.DATE, SUNDAY-cal.get(DAY_OF_WEEK)); //1日が属する週の日曜日の日付. ex)2019/5/1→2019/4/28
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22
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System.out.println();
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System.out.println(year + "/" + (month+1) + (((java.util.GregorianCalendar)cal).isLeapYear(year)?"(うるう年)":"") );
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@@ -26,6 +25,7 @@
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26
25
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System.out.println("日 月 火 水 木 金 土");
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27
26
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System.out.println("---------------------");
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28
27
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28
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+
cal.add(Calendar.DATE, SUNDAY-cal.get(DAY_OF_WEEK)); //1日が属する週の日曜日の日付. ex)2019/5/1→2019/4/28
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29
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for (; cal.get(MONTH) <= month; cal.add(DATE, 1)) {
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30
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System.out.printf(cal.get(MONTH)<month?" ":"%2d ", cal.get(DATE));
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31
31
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if (cal.get(DAY_OF_WEEK) == SATURDAY) System.out.println();
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1
Calendar 定数を import static 化
answer
CHANGED
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@@ -4,6 +4,7 @@
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4
4
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package calendar;
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5
5
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import java.util.Calendar;
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6
6
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import java.util.Scanner;
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7
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+
import static java.util.Calendar.*;
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7
8
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8
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public class Mycalendar {
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9
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public static void main(String[] args) {
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@@ -17,7 +18,7 @@
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17
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cal.set(Calendar.YEAR, year);
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cal.set(Calendar.MONTH, month);
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cal.set(Calendar.DATE, 1);
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20
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-
cal.add(Calendar.DATE,
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21
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+
cal.add(Calendar.DATE, SUNDAY-cal.get(DAY_OF_WEEK)); //1日が属する週の日曜日の日付. ex)2019/5/1→2019/4/28
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System.out.println();
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System.out.println(year + "/" + (month+1) + (((java.util.GregorianCalendar)cal).isLeapYear(year)?"(うるう年)":"") );
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@@ -25,9 +26,9 @@
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25
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System.out.println("日 月 火 水 木 金 土");
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26
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System.out.println("---------------------");
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27
28
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28
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-
for (; cal.get(
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29
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+
for (; cal.get(MONTH) <= month; cal.add(DATE, 1)) {
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29
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-
System.out.printf(cal.get(
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30
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System.out.printf(cal.get(MONTH)<month?" ":"%2d ", cal.get(DATE));
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30
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-
if (cal.get(
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31
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+
if (cal.get(DAY_OF_WEEK) == SATURDAY) System.out.println();
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31
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}
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}
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}
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