>>101
private static Calendar calendar = Calendar.getInstance();
private static final String[] TIME_STR = {"■■■■","□■■■","■□■■","□□■■","■■□■","□■□■","■□□■","□□□■","■■■□","□■■□"};

public static synchronized String clock() {
StringBuilder ret = new StringBuilder();

calendar.setTimeInMillis(System.currentTimeMillis());
int h = calendar.get(Calendar.HOUR_OF_DAY);
int m = calendar.get(Calendar.MINUTE);
int s = calendar.get(Calendar.SECOND);

ret.append(TIME_STR[h/10]).append("\n");
ret.append(TIME_STR[h%10]).append("\n");
ret.append(TIME_STR[m/10]).append("\n");
ret.append(TIME_STR[m%10]).append("\n");
ret.append(TIME_STR[s/10]).append("\n");
ret.append(TIME_STR[s%10]).append("\n");

return ret.toString();
}

こんなんじゃ駄目かね？