1、package zixi_3;
public class l2 {
public static void main(String[] args) {
//int i=2000;
//if(i%4==0&&i%100==0||i%400==0){System.out.println(i+"是闰年");}
//else{System.out.println(i+"是平年");}
int i=2001;
String str=(i%4==0&&i%100==0||i%400==0)?"闰年":"平年";
System.out.println(i+str);
}
}
2、//int i=2000;
//if(i%4==0&&i%100==0||i%400==0){System.out.println(i+"是闰年");}
//else{System.out.println(i+"是平年");}
这是第二种方法，判断。
3、public class lian3 {
public static void main(String[] args) {
int year = 2017;
int month = 7;
if (year % 4 == 0 && year % 100 == 0 || year % 400 == 0) {
4、System.out.println(year + "是闰年");
} else {
System.out.println(year + "是平年");
}
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
System.out.println(month + "月份有31天。");
} else if (month == 4 || month == 6 || month == 9 || month == 11) {
5、System.out.println(month + "月份有30天。");
} else if (month == 2) {
if (year % 4 == 0 && year % 100 == 0 || year % 400 == 0) {
System.out.println(month + "月份有29天。");
}else {System.out.println(month + "月份有28天。");}}}}
6、给定年份和月份，判断该月下有多少天。
首先判断平年闰年，输出。然后把月份分成三部分，1,3,5,7,8,10,12为31天，2月份两种情况，嵌套if语句。即可
