编程实现输出某年某个月的天数。使用switch。java

在Java中，你可以使用`switch`结构结合嵌套的`if`条件来计算给定年月的天数。这里是一个简单的示例，它假设月份从1到12，并考虑了闰年的规则：

public int getDaysInMonth(int year, int month) {
    int days;
    switch (month) {
        case 2: // February
            if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) { // Leap year check
                days = 29;
            } else {
                days = 28;
            }
            break;
        case 4:
        case 6:
        case 9:
        case 11: // Months with 30 days
            days = 30;
            break;
        default: // January, March, May, July, August, October, December
            days = 31;
            break;
    }
    return days;
}

// 使用示例
int year = 2023; // 输入年份
int month = 2;   // 输入月份
System.out.println("Number of days in " + year + " " + month + " is: " + getDaysInMonth(year, month));