输入年月日判断是这一年的第几天 蠢方法

import java.util.Scanner; public class rinqi { public static void main(String []ages){ Scanner a=new Scanner(System.in); int tian=0; int k; System.out.println("请输入年月日"); int nian=a.nextInt(); int yue=a.nextInt(); int ri=a.nextInt(); switch (yue){ case 1: tian=0; break; case 2: tian=31; break; case 3: tian=59; break; case 4: tian=90; break; case 5: tian=120; break; case 6: tian=151; break; case 7: tian=181; break; case 8: tian=212; break; case 9: tian=243; break; case 10: tian=273; break; case 11: tian=304; break; case 12: tian=334; break; default: System.out.println("输入月份错误"); break; } tian=tian+ri; if(nian%400==0||(nian%4==0&&nian%100!=0)) { k = 1; }else { k = 0; } if(k==1&&yue>2){ tian++; System.out.println("是这一年的"+tian); }else { System.out.println("这一天是这一年的第"+tian+"天"); }

}

}