每日一练------判断是一年的第几天

来源：互联网发布：阿里云maven镜像站编辑：程序博客网时间：2024/05/16 05:36

import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;

/*
* 题目：输入某年某月某日，判断这一天是这一年的第几天？
* 虽然写的代码不精简，但是逻辑简单，易懂
*/
public class Basic14 {

public static void main(String[] args) {
Basic14 my = new Basic14();
my.judge();

}

public void judge()
{
  System.out.println("请输入年，月，日");
  Scanner sc =new Scanner(System.in);
  int year=0;
  int month=0;
  int day=0;
  try {
   year = sc.nextInt();
   month = sc.nextInt();
   day = sc.nextInt();
  } catch (Exception e) {
   // TODO Auto-generated catch block
   System.out.println("输入有误");
   judge();
  }
  int month1 = 31;
  int month2 = 28;
  int month3 = 31;
  int month4 = 30;
  int month5 = 31;
  int month6 = 30;
  int month7 = 31;
  int month8 = 31;
  int month9 = 30;
  int month10 = 31;
  int month11 = 30;
  int month12 = 31;
  if(isRunnian(year))
  {
   month2 = 29;
  }
  int result = 0;
  switch(month)
  {
   case 1:
    result = day;break;
   case 2:
    result = month1+day;break;
   case 3:
    result = month1+month2+day;break;
   case 4:
    result = month1+month2+month3+day;break;
   case 5:
    result = month1+month2+month3+month4+day;break;
   case 6:
    result = month1+month2+month3+month4+month5+day;break;
   case 7:
    result = month1+month2+month3+month4+month5+month6+day;break;
   case 8:
    result = month1+month2+month3+month4+month5+month6+month7+day;break;
   case 9:
    result = month1+month2+month3+month4+month5+month6+month7+month8+day;break;
   case 10:
    result = month1+month2+month3+month4+month5+month6+month7+month8+month9+day;break;
   case 11:
    result = month1+month2+month3+month4+month5+month6+month7+month8+month9+month10+day;break;
   case 12:
    result = month1+month2+month3+month4+month5+month6+month7+month8+month9+month10+month11+day;break;
  }

  System.out.println("是"+year+"年的第"+result+"天");
  judge();

}
public static boolean isRunnian(int year)
{
  boolean result = false;
  if((year%400==0)||(((year%4)==0)&&((year%100)!=0)))
  {
   result=true;
  }
  return result;
}

}
运行结果如下图

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