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以一个月和一年作为参数,并显示该月中的天数。
public class Main { public static void main(String[] arguments) {//时 代 J a v a 公 众 号 - N o w J a v a . c o m 提 供 int yearIn = 2012; int monthIn = 1; if (arguments.length > 0) monthIn = Integer.parseInt(arguments[0]); if (arguments.length > 1) yearIn = Integer.parseInt(arguments[1]); System.out.println(monthIn + "/" + yearIn + " has " + countDays(monthIn, yearIn) + " days."); } static int countDays(int month, int year) { int count = -1;/**from 时 代 J a v a - N o w J a v a . c o m**/ switch (month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: count = 31; break; case 4: case 6: case 9: case 11: count = 30; break; case 2: