Java实现给定任意年份和月份,输出该月有多少天

项目开发过程中，细节性的地方需要判定某年某月多少天，写了个下面的小工具解决了此问题

    package weiming.lmapp.utils;  

    public class GetDays {  

    /** * 闰年的条件(满足之一即可):(1)能被4整除,但不能被100整除;(2)能被400整除 * @param year * @param month * @return 返回天数 */  
    public static int getDays(int year, int month) {  
    int days = 0;  
    boolean isLeapYear = false;  
    if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {  
    System.out.println("--------------------闰年-------------------");  
    isLeapYear = true;  
    } else {  
    System.out.println("--------------------非闰年-------------------");  
    isLeapYear = false;  
    }  
    switch (month) {  
    case 1:  
    case 3:  
    case 5:  
    case 7:  
    case 8:  
    case 10:  
    case 12:  
    days = 31;  
    break;  
    case 2:  
    if (isLeapYear) {  
    days = 29;  
    } else {  
    days = 28;  
    }  
    break;  
    case 4:  
    case 6:  
    case 9:  
    case 11:  
    days = 30;  
    break;  
    default:  
    System.out.println("error!!!");  
    break;  
    }  
    return days;  
    }  
    }