用两位数的格式显示日期

Question

我想以两位数的格式显示日期，我希望它是这样的：当月或日是一个单一的数字时，4会显示为04。如何实现呢？

Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int day = c.get(Calendar.DAY_OF_MONTH);
        int month = c.get(Calendar.MONTH);

        if (month % 10 == 0) {

            Place = 0 + month;
        }
        String Dates = year + "-" + Place + "-" + day;
        Date.setText((Dates));

Answer 1

DecimalFormat mFormat= new DecimalFormat("00");
mFormat.format(Double.valueOf(year));

在你的例子中:

 mFormat.setRoundingMode(RoundingMode.DOWN);
 String Dates =  mFormat.format(Double.valueOf(year)) + "-" +  mFormat.format(Double.valueOf(Place)) + "-" +  mFormat.format(Double.valueOf(day));