java - 如何打印给定日期年月日？

Question

在此我得到闰年和普通年份和月份，但我不知道如何获取给定日期月份年份的日期。还有一个问题:1800年和1900年是平年，但我知道这些年是闰年。你能解决这个问题吗？

import java.util.Scanner;

class day {

    public static void main(String arg[]) {
        int tm, sm, w;
        int y;
        int[] m = new int[12];
        m[0] = 31;
        m[1] = 28;
        m[2] = 31;
        m[3] = 30;
        m[4] = 31;
        m[5] = 30;
        m[6] = 31;
        m[7] = 31;
        m[8] = 30;
        m[9] = 31;
        m[10] = 30;
        m[11] = 31;
        //{31,28,31,30,31,30,31,31,30,31,30,31};
        String[] mo = new String[12];
        mo[0] = "January";
        mo[1] = "February";
        mo[2] = "March";
        mo[3] = "April";
        mo[4] = "May";
        mo[5] = "June";
        mo[6] = "July";
        mo[7] = "August";
        mo[8] = "September";
        mo[9] = "October";
        mo[10] = "November";
        mo[11] = "December";
        String[] we = new String[w];
        we[0] = "Sunday";
        we[1] = "Monday";
        we[2] = "Tuesday";
        we[3] = "Wednesday";
        we[4] = "Thursday";
        we[5] = "Friday";
        we[6] = "Saturday";
        Scanner ip = new Scanner(System.in);
        System.out.print("\nEnter year ");
        y = ip.nextInt();
        System.out.print("\nEnter month ");
        sm = ip.nextInt();
        if (y % 4 == 0) {
            m[1] = m[1] + 1;
            for (tm = 1; tm <= m.length; tm++) {
                if (tm == sm) {
                    System.out.print("\n" + y + " is a Leap Year\n"
                            + mo[sm - 1] + " month " + "has " + m[sm - 1] + " days\n");
                }
            }
        } else {
            for (tm = 1; tm <= 12; tm++) {
                if (tm == sm) {
                    System.out.print("\n" + y + " is an Ordinary year\n"
                            + mo[sm - 1] + " month " + "has " + m[sm - 1] + " days\n");
                }
            }
        }
    }
}

Answer 1

这是如何识别公历的闰年

if ((y % 4 == 0  && y % 100 !=0) || y % 400 == 0) {
  ...

参见http://en.wikipedia.org/wiki/Leap_year