算法提高 日期计算 蓝桥杯java详解

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import java.util.Scanner;public class Main {	public static void main(String[] args) {		Scanner input=new Scanner(System.in);		int year=input.nextInt();		int month=input.nextInt();		int day=input.nextInt();		int sum;		int sum1;        sum=getyd(year);
        //计算真实的天数        if(year<2011){        	sum=sum-getmd(year,month,day);            //判断给出的某年某月是星期几        	sum1=(sum%7==6)?7:Math.abs(6-(sum%7));        	System.out.println(sum1);        }else {        	sum=sum+getmd(year,month,day);        	sum1=((6+(sum%7))>7)?(6+(sum%7))%7:(6+(sum%7));        	System.out.println(sum1);        }	}		//计算的与给出的月份和已知的月份的总共月数  public static int getmd(int year,int month,int day) {	  int sum1=0;		for(int i=1;i<month;i++){			if(i==1||i==3||i==5||i==7||i==8||i==10||i==12){				sum1+=31;			}else if(i==4||i==6||i==9||i==11){				sum1+=30;			}else if(i==2&&leap(year)){				sum1+=29;			}else if(i==2&&!leap(year)){				sum1+=28;			}		}		sum1=sum1+day-1;		return sum1;	}	//计算年份的天数	public static int getyd(int year) {		int sum=0;       if(year<=2011){    	   for(int i=year;i<2011;i++){    		   if(leap(i)){    			  sum+=366;     		   }else sum+=365;    	   }	   }else if(year>2011){    	   for(int i=2011;i<year;i++){    		   if(leap(i)){    			   sum+=366;    		   }else sum+=365;    	   }       }		return sum;	}	//判断给出的年份是否是闰年    public static boolean leap(int year) {		if(year%4==0&&year%100!=0){			return true;		}else if(year%400==0){			return true;		}else		return false;	}
}