/*
* 键盘输入年份和月份,然后控制台返回该月份的天数(闰年2月29天). * */public class Demo01 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入年份:"); int year = sc.nextInt(); System.out.println("请输入月份:"); int month = sc.nextInt(); if(month<=0 || month>12){ System.out.println("请输入正确的月份!"); }else if(month==4 || month==6 || month==9 || month==11){ System.out.println(year+"年"+month+"月有:30天"); }else if(month==2){ if(month%4==0 && month%100!=0 || month%400==0){ System.out.println(year+"年"+month+"月有:29天"); }else{ System.out.println(year+"年"+month+"月有:28天"); } }else{ System.out.println(year+"年"+month+"月有:30天"); } }}