java怎么生成连续订单号

?Java?,?????????????????????????????:

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3. ??????????1,????????

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// ???????????,?????????
private static int currentOrderNumber = 1;
// ????????
public static String generateOrderNumber() {
// ?????????
int currentNumber = currentOrderNumber;
// ??????1,???????
int newNumber = currentNumber + 1;
// ?????????
currentOrderNumber = newNumber;
// ??????????????
String orderNumber = String.format("d", newNumber);
return orderNumber;
}
// ????????
public static void main(String[] args) {
String orderNumber = generateOrderNumber();
System.out.println("??????:" + orderNumber);
}

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