时间对比、流水号计算、100%统计

来源：互联网发布：excel如何数据分析编辑：程序博客网时间：2024/05/29 10:37

项目最近有个几以前没遇到的场景，记录下来，供以后查阅，有更好实现的盆友，忘多多分享。

时间对比

private static void diffTime() {DateFormat df = new SimpleDateFormat("yyyy-MM-dd");try {Date d1 = df.parse("2004-12-03");Date d2 = df.parse("2004-12-12");System.out.println(d2.before(d1));} catch (ParseException e) {//格式错误}}

通过Date方法的before和after方法判断

100%统计

private static double getAllFund(String govFund, String stateFund, String collectiveFund,String privateFund, String foreignFund, String otherFund) {double sum = add(govFund, stateFund);sum = add(Double.toString(sum), collectiveFund);sum = add(Double.toString(sum), privateFund);sum = add(Double.toString(sum), foreignFund);sum = add(Double.toString(sum), otherFund);return sum;}  public static double add(String v1, String v2) {  BigDecimal b1 = new BigDecimal(v1);  BigDecimal b2 = new BigDecimal(v2);  return b1.add(b2).doubleValue(); }

根据多个百分数统计，最后统计出总和，使用BigDecimal避免出现多为小数点的情况。

流水号计算

private static Calendar pre= null ;private static int index = 1;private static SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");public static synchronized String getSerialNumber() {Calendar current = Calendar.getInstance();StringBuffer sb = new StringBuffer(sdf.format(current.getTime()));if (pre == null) {//刚进入pre = current;index = 1;sb.append("001");} else {//比较年月日，相同时加1int preYear=pre.get(Calendar.YEAR);//得到年int preMonth=pre.get(Calendar.MONTH)+1;//得到月，因为从0开始的，所以要加1int preDay=pre.get(Calendar.DAY_OF_MONTH);//得到天int currentYear=current.get(Calendar.YEAR);//得到年int currentMonth=current.get(Calendar.MONTH)+1;//得到月，因为从0开始的，所以要加1int currentDay=current.get(Calendar.DAY_OF_MONTH);//得到天if (preYear == currentYear && preMonth==currentMonth && preDay == currentDay) {//当年月日相同时，流水号加1String temp = String.valueOf(++index);int length = temp.length();for(int i = 0; i<3-length;i++) {sb.append("0");}sb.append(temp);} else {//不同时，从001开始pre = current;index = 1;sb.append("001");}}return sb.toString();}

流水号以年月日加上后3位数字，从001开始。

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