参考答案：
提示用户输入月份和年份，然后显示这个月的天数。
public class ExamDemo {
public
static void main(String[] args) {
java.util.Scanner
input = new java.util.Scanner(System.in);
System.out.print("Enter
a month in the year (e.g., 1 for Jan): ");
int
month = input.nextInt();
System.out.print("Enter
a year: ");
int
year = input.nextInt();
int
numberOfDaysInMonth = 0;
switch
(month) {
case
1:
System.out.print("January
" + year);
numberOfDaysInMonth
= 31;
break;
case
2:
System.out.print("February
" + year);
if
(year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
numberOfDaysInMonth
= 29;
else
numberOfDaysInMonth
= 28;
break;
case
3:
System.out.print("March
" + year);
&n...
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