判断日期

输入某年某月某日，判断这一天是这一年中的第几天（注意闰年） 运行结果示例： public static void main(String[] args){ int feb=28; 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"); int month=sc.nextInt(); System.out.println("请输入日"); int day=sc.nextInt(); if(year%4==0 && year0!=0 || year@0==0){ feb=29; } int sum = 0; switch(month){ case 1 : sum=day; break; case 2 : sum=31+day; break; case 3 : sum=31+feb+day; break; case 4 : sum=31+feb+31+day; break; case 5 : sum=31+feb+31+30+day; break; case 6 : sum=31+feb+31+30+31+day; break; case 7 : sum=31+feb+31+30+31+30+day; break; case 8 : sum=31+feb+31+30+31+30+31+day; break; case 9 : sum=31+feb+31+30+31+30+31+31+day; break; case 10 : sum=31+feb+31+30+31+30+31+31+30+day; break; case 11 : sum=31+feb+31+30+31+30+31+31+30+31+day; break; case 12 : sum=31+feb+31+30+31+30+31+31+30+31+30+day; break; } System.out.println(year+"年 "+month+"月 " + day + "号是"+year+"年的第"+sum+"天"); }