【java常用】数据类型转换

Date date = sdf.parse( " 2008-07-10 19:20:00 " ); 
 String s = dateTimeResources + "-" + "01" + "-" + "01";
 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM");
 Date date = simpleDateFormat.parse(s);
//格式化
 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM");
 Date y1 = simpleDateFormat.parse(date);

 Date date = new Date();
 String format = DateFormat.getDateInstance().format(date);
 List<String> idList = Arrays.asList(format.split("-"));

Calendar calendar = Calendar.getInstance();

Date date = calendar.getTime().getTime();

Calendar calendar = Calendar.getInstance();

Date date = calendar.getTime();

Date date = new Date();

Calendar calendar = Calendar.getInstance();

calendar.setTime(date );

DecimalFormat df = new DecimalFormat("0.00%");
System.out.println(df.format(0.1234));

 private double convertDouble(String monthTotalWorkLoadStr) {
        if (monthTotalWorkLoadStr == null || "".equals(monthTotalWorkLoadStr.trim())) {
            monthTotalWorkLoadStr = "0";
        }

        double monthTotalWorkLoadDouble = Double.parseDouble(monthTotalWorkLoadStr);
        return monthTotalWorkLoadDouble;
    }

String format = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));