System.out.printf格式

Question

我写下了以下代码：

public class FractionOfDay {

    public static double fractionOfDay(double h, double m, int s, char a ) {
        double y = -1;
        if (a == 'P' && h == 12) {
            double x = (h * 60 * 60) + (m * 60) + (s);
             y = x / 86400;
        } else if (a == 'P' && h != 12) {
            double x = ( (h + 12) * 60 * 60) + (m * 60) + (s);
            y = x / 86400;
        } else if (a == 'A' && h == 12) {
            double x = (m * 60) + (s);
            y = x / 86400;
        } else if (a == 'A' && h != 12) {
            double x = ( (h) * 60 * 60) + (m * 60) + (s);
            y = x / 86400;
        }
        return y;
    }

    public static void main(String[] args) {
        System.out.println(fractionOfDay(12, 0, 0, 'P'));
    }
}

它打印出从上午12点开始的一天中的一小部分。 如何使用printf？

打印此类表格

Answer 1

使用Calendar类

public static void main(String[] args) {
  Calendar c = Calendar.getInstance();
  System.out.format("%tl:%tM %tp %10.4f%n", c, c, c, 
    fractionOfDay(
      c.get(Calendar.HOUR),
      c.get(Calendar.MINUTE),
      c.get(Calendar.SECOND),
     (Calendar.AM == c.get(Calendar.AM_PM)) ? 'A' : 'P'));
}