DateTimeFormatter class

ofPatternの中のパターン文字ではない値は''で囲う
Locale.Category.DISPLAYは何が変わるのか不明
Locale.Category.CATEGORYは通貨日付に影響

public class SampleProject {
    public static void main(String args[]) {
        method();
        Locale.setDefault(Locale.US);
        method();
        Locale.setDefault(Locale.Category.DISPLAY,Locale.JAPAN);
        method();
        Locale.setDefault(Locale.Category.FORMAT,Locale.JAPAN);
        method();
    }
    static void method() {
        System.out.println("----------------");
        
        LocalDateTime ld = LocalDateTime.now();
        System.out.println(DateTimeFormatter.BASIC_ISO_DATE.format(ld));
        System.out.println(DateTimeFormatter.ISO_DATE.format(ld));
        System.out.println(DateTimeFormatter.ISO_TIME.format(ld));
        System.out.println(DateTimeFormatter.ISO_DATE_TIME.format(ld));
        DateTimeFormatter f1 = DateTimeFormatter.ofPattern("yyyyねんMMがつddひe");
        DateTimeFormatter f11 = DateTimeFormatter.ofPattern("yyyyねんMMMがつddひee");
        DateTimeFormatter f12 = DateTimeFormatter.ofPattern("'eee'yyyyねんMMMMがつddひeee");
        DateTimeFormatter f15 = DateTimeFormatter.ofPattern("yyyy'ねん'MMMM'がつ'dd'ひ'eeee");
        DateTimeFormatter f13 = DateTimeFormatter.ofPattern("yyyyねんMMMMMがつddひeeeee");
//        DateTimeFormatter f14 = DateTimeFormatter.ofPattern("yyyyねんMMMMMMがつddひeeeeee");   //err  too many M  too many e
        DateTimeFormatter f2 = DateTimeFormatter.ofLocalizedDate(FormatStyle.FULL);
        DateTimeFormatter f3 = DateTimeFormatter.ofLocalizedDate(FormatStyle.LONG);
        DateTimeFormatter f4 = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM);
        DateTimeFormatter f5 = DateTimeFormatter.ofLocalizedDate(FormatStyle.SHORT);
        System.out.println(f1.format(ld));
        System.out.println(f11.format(ld));
        System.out.println(f12.format(ld));
         System.out.println(f15.format(ld));
       System.out.println(f13.format(ld));
        System.out.println(f2.format(ld));
        System.out.println(f3.format(ld));
        System.out.println(f4.format(ld));
        System.out.println(f5.format(ld));
    }
}

----------------
20230305
2023-03-05
12:27:21.5919478
2023-03-05T12:27:21.5919478
2023ねん03がつ05ひ1
2023ねんMarがつ05ひ01
eee2023ねんMarchがつ05ひSun
2023ねんMarchがつ05ひSunday
2023ねんMがつ05ひS
Sunday, March 5, 2023
March 5, 2023
Mar 5, 2023
3/5/23
----------------
20230305
2023-03-05
12:27:21.7482069
2023-03-05T12:27:21.7482069
2023ねん03がつ05ひ1
2023ねんMarがつ05ひ01
eee2023ねんMarchがつ05ひSun
2023ねんMarchがつ05ひSunday
2023ねんMがつ05ひS
Sunday, March 5, 2023
March 5, 2023
Mar 5, 2023
3/5/23
----------------
20230305
2023-03-05
12:27:21.7482069
2023-03-05T12:27:21.7482069
2023ねん03がつ05ひ1
2023ねんMarがつ05ひ01
eee2023ねんMarchがつ05ひSun
2023ねんMarchがつ05ひSunday
2023ねんMがつ05ひS
Sunday, March 5, 2023
March 5, 2023
Mar 5, 2023
3/5/23
----------------
20230305
2023-03-05
12:27:21.7482069
2023-03-05T12:27:21.7482069
2023ねん03がつ05ひ1
2023ねん3月がつ05ひ01
eee2023ねん3月がつ05ひ日
2023ねん3月がつ05ひ日曜日
2023ねん3がつ05ひ日
2023年3月5日日曜日
2023年3月5日
2023/03/05
2023/03/05