java如何生成12位序列號(hào)？

private static int maxvaluefive=99999999;

private static int minvaluefive=0;

private static AtomicInteger atomic = new AtomicInteger(minvaluefive);

/** 生成序列號(hào) */

static String getSeqFive(int coverPad) {

for (;;) {

int current = atomic.get();

int newValue = current >= maxvaluefive ? minvaluefive : current + 1;

if (atomic.compareAndSet(current, newValue)) {

return StringUtils.leftPad(String.valueOf(current), coverPad, "0");

}

}

}