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LocalDateTime time = LocalDateTime.now(); time = time.plusMinutes(5);//获取当前时间并加5分钟 time = time.minusMinutes(5);//获取当前时间并减去5分钟 time = time.plusHours(5);//获取当前时间并加5小时 time = time.minusHours(5);//获取当前时间并减去5小时...

public static void main(String[] args) { int productNum = 18; int firstPiece = 2; int extendPiece = 3; int num = (int) Math.ceil((double)(productNum - firstPiece) / extendPiece); System.out.println("num " + num);}

1，将含有指定分隔符的字符串拆分为数组2，sort排序后3，通过指定分隔符合并为新的字符串详情：https://www.toutiao.com/i6812848339084640780/