Method formatYear

base/src/main/java/net/time4j/PlainDate.java:2098–2126

(
        StringBuilder sb,
        int year
    )

    }

    private static void formatYear(
        StringBuilder sb,
        int year
    ) {

        int value = year;

        if (value < 0) {
            sb.append('-');
            value = MathUtils.safeNegate(year);
        }

        if (value >= 10000) {
            if (year > 0) {
                sb.append('+');
            }
        } else if (value < 1000) {
            sb.append('0');
            if (value < 100) {
                sb.append('0');
                if (value < 10) {
                    sb.append('0');
                }
            }
        }

        sb.append(value);

    }

    private static void format2Digits(
        StringBuilder sb,