Java – get Japanese year name

I have a program to get Japanese character year names:

Locale locale = new Locale("ja","JP","JP");
Calendar calendar = Calendar.getInstance(locale);
calendar.set(Calendar.YEAR,1);
Date date = calendar.getTime();

DateFormat format1
        = new SimpleDateFormat("GGGGy年",locale);
System.out.println("y: " + format1.format(date));

DateFormat format2
    = new SimpleDateFormat("GGGGyy年",locale);
System.out.println("yy: " + format2.format(date));

DateFormat format3
    = new SimpleDateFormat("GGGGyyy年",locale);
System.out.println("yyy: " + format3.format(date));

DateFormat format4
    = new SimpleDateFormat("GGGGyyyy年",locale);
System.out.println("yyyy: " + format4.format(date));

Printing in the eclipse console is like this, which is what I want

y: 平成1年
yy: 平成01年
yyy: 平成001年
yyyy: 平成元年

However, when I make a jar and CMD runs it, the output changes to:

y: Heisei1年
yy: Heisei01年
yyy: Heisei001年
yyyy: Heisei1年

I don't know why. I want to get Chinese characters Please help me thank you.

Solution

I run the following test cases:

Locale WAREKI_LOCALE = new Locale("ja","JP");
    TimeZone tz = TimeZone.getTimeZone("JST");
    Calendar jcal = Calendar.getInstance(tz,WAREKI_LOCALE);

    SimpleDateFormat sdf = new SimpleDateFormat("GGGG y-MM-dd zzz",WAREKI_LOCALE);
    sdf.setCalendar(jcal);
    SimpleDateFormat sdf2 = new SimpleDateFormat("GGGG y-MM-dd zzz",Locale.UK);
    System.out.println("got = " + sdf.format(1549556043201L) + " (" + sdf2.format(1549556043201L) + ")");

    System.out.println("got = " + sdf.format(-1357544756799L) + " (" + sdf2.format(-1357544756799L) + ")");

And use JDK 8 and JDK 11 to obtain the following outputs:

got = 平成 31-02-08 JST (AD 2019-02-07 CET)
got = 昭和 1-12-26 JST (AD 1926-12-25 CET)

You can also see: https://github.com/twosigma/OpenJDK/blob/master/test/jdk/java/util/Calendar/SupplementalJapaneseEraTest.java