/**  * SwitchDemo2.java is an application that compiles and runs * under J2SE 5.0. It requires no other files. * * In a real program, you'd probably use the date API * instead of calculating days per month. */public class SwitchDemo2 {    public static void main(String[] args) {        int month = 2;        int year = 2000;        int numDays = 0;        switch (month) {            case 1:            case 3:            case 5:            case 7:            case 8:            case 10:            case 12:                numDays = 31;                break;            case 4:            case 6:            case 9:            case 11:                numDays = 30;                break;            case 2:                if ( ((year % 4 == 0) && !(year % 100 == 0))                     || (year % 400 == 0) )                    numDays = 29;                else                    numDays = 28;                break;            default:                numDays = 0;                break;        }        System.out.println("Number of Days = " + numDays);    }}