蓝桥杯 Java 任意年月日历输出 算法提高

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Java 任意年月日历输出 算法提高

import java.util.Scanner;
public class Main {
  public static boolean isLeap(int year) {
    boolean flag = false;
    if(year % 4 == 0 && year % 100 != 0)
      flag = true;
    else if(year % 400 == 0)
      flag = true;
    else
      flag = false;
    return flag;
  }
  public static int getDay(int month, int year) {
    int day = 0;
    if (month == 2) {
      if (isLeap(year)) 
        day = 29;
      else 
        day = 28;
    } else if (month < 8) {
      if(month % 2 == 0)
        day = 30;
      else
        day = 31;
    } else {
      if(month % 2 == 0)
        day = 31;
      else
        day = 30;
    }
    return day;
  }
  public static int getFirst(int month, int year) {
    int first = 0;
    int distance = year - 2007;
    int day = 0;
    
    while (distance / 4 >= 1) {
      day += (365 * 4 + 1);
      distance -= 4;
    }
    int count = 0;
    while (distance > 0) {
      if (count == 1) 
        day += 366;
      else
        day += 365;
      count++;
      distance--;
    }
    int fre = 0;
    if(isLeap(year))
      fre = 31 + 29;
    else
      fre = 31 + 28;
    int mon[] = {0, 0, 31, fre, fre+31, fre+61, fre+92, fre+122, fre+153, fre+184, fre+214, fre+245, fre+275};
    day += mon[month];
    first = day % 7;
    return first+1;
  }
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int year = sc.nextInt();
    int month = sc.nextInt();
    sc.close();
    
    if(year < 2007)
      return;
    
    int day = getDay(month, year);
    int firstDay = getFirst(month, year);
    
    if(month < 10)
      System.out.println("Calendar " + year + " - 0" + month);
    else
      System.out.println("Calendar " + year + " - " + month);
    for (int i = 0; i < 21; i++) 
      System.out.print("-");
    System.out.print("\n");
    System.out.println("Su Mo Tu We Th Fr Sa ");    
    for (int i = 0; i < 21; i++) 
      System.out.print("-");
    System.out.print("\n");
    int count = 0;
    if(firstDay != 7)
      for (int i = 0; i < firstDay; i++) {
        System.out.print("   ");
        count++;
      }       
    for (int i = 1; i <= day; i++) {
      if(i < 10)
        System.out.print(" " + i + " ");
      else
        System.out.print(i + " ");
      count++;
      if(count % 7 == 0)
        System.out.print("\n");
    }
    System.out.print("\n");
    for (int i = 0; i < 21; i++) 
      System.out.print("-");
  }

}

​谢谢大家的支持，您的一键三连是 罡罡同学前进的最大动力！​

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