大家好，又见面了，我是你们的朋友全栈君。
package 算法;
import java.util.Calendar;
import java.util.Scanner;
public class 判断年月日的那一天 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scanner=new Scanner(System.in);
System.out.println(“输入年：”);
int year=scanner.nextInt();
System.out.println(“输入月：”);
int month=scanner.nextInt();
System.out.println(“输入日：”);
int day=scanner.nextInt();
int sum=0;
int sum2=0;
//方法一
Calendar cal=Calendar.getInstance();
cal.set(year, month-1,day);
sum2=cal.get(Calendar.DAY_OF_YEAR);
System.out.println(“第”+sum2+” 天”);
//方法2
switch (month-1) {
case 12:
sum+=31;
case 11:
sum+=30;
case 10:
sum+=31;
case 9:
sum+=30;
case 8:
sum+=31;
case 7:
sum+=31;
case 6:
sum+=30;
case 5:
sum+=31;
case 4:
sum+=30;
case 3:
sum+=31;
case 2:
if(year%400==0||(year%4==0||year%100==0)){
sum+=29;
}else{
sum+=28;
}
case 1:
sum+=31;
default:
break;
}
sum+=day;
System.out.println(“是第”+sum+”天”);
}
}
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