Method append2Digits

base/src/main/java/net/time4j/PlainTime.java:1900–1911

(
        int element,
        StringBuilder sb
    )

    }

    private static void append2Digits(
        int element,
        StringBuilder sb
    ) {

        if (element < 10) {
            sb.append('0');
        }

        sb.append(element);

    }

    private static void checkHour(long hour) {