switchenumdemo.java

来自「Java样例程序集合：2D」· Java 代码 · 共 49 行

/** 
 * SwitchEnumDemo.java is an application that compiles and runs
 * under J2SE 5.0 (and *not* under earlier releases).
 * It requires no other files.
 *
 * It's an enum-based equivalent to SwitchDemo2.java.
 */

public class SwitchEnumDemo {
    public enum Month { JANUARY, FEBRUARY, MARCH, APRIL,
                        MAY, JUNE, JULY, AUGUST, SEPTEMBER,
                        OCTOBER, NOVEMBER, DECEMBER }

    public static void main(String[] args) {
        Month month = Month.FEBRUARY;
        int year = 2000;
        int numDays = 0;

        switch (month) {
            case JANUARY:
            case MARCH:
            case MAY:
            case JULY:
            case AUGUST:
            case OCTOBER:
            case DECEMBER:
                numDays = 31;
                break;
            case APRIL:
            case JUNE:
            case SEPTEMBER:
            case NOVEMBER:
                numDays = 30;
                break;
            case FEBRUARY:
                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);
    }
}