根据传入的日期和会员天数计算时间截止日期

package controller;
/**


Created by Lenovo on 2023/7/22.

*/

public class ExtentionAlgorithm {
public static void main(String[] args) {

System.out.println("Hello World!");

System.out.println(isLeapYear(2000));

System.out.println(isLeapYear(2023));

System.out.println(isLeapYear(5001));

}
/**


vipStartTime:    2023/07/22 20:05:00


vipDays:         21Days


vipEndTime:      2023/10/22 20:05:00


@param startTime


@param vipDays


@return

*/

public static String getVipExpriedDate(String startTime, int vipDays){

if(startTime==null){

return null;

}

if(startTime.isEmpty()){

return null;

}

if(vipDays<=0){

return startTime;

}
String substringYearDate = startTime.substring(0, 4);

Integer integerYearDate = Integer.valueOf(substringYearDate);

int yearDate=integerYearDate;

int yearCount = vipDays / 365;

if (yearCount>0){

while (true){

if (isLeapYear(yearDate)){

yearDate+=1;

vipDays-=366;

}else {

yearDate+=1;

vipDays-=365;

}
     yearCount--;
     if (yearCount&lt;0){
         break;
     }
 }

}else {

int intMonthCount = vipDays / 28;

if (intMonthCount>0){

String monthDateStr=startTime.substring(5,7);

Integer integerMonth = Integer.valueOf(monthDateStr);

while (true){

switch (integerMonth){

//                        case CustMonthName.getKey("JAN"):

//                            break;

default:

break;

}

integerMonth--;

if (integerMonth<0){

break;

}

}

}

}
String vipEndTime=null;

return vipEndTime;

}


/**


2023


2000


判断年份是平年还是闰年


@param yearDate


@return

*/

public static Boolean isLeapYear(int yearDate){

if (yearDate<0){

return null;

}

String yearDateStr = String.valueOf(yearDate);

if (yearDateStr==null){

return null;

}

if (yearDateStr.isEmpty()){

return null;

}

if (yearDateStr.length()!=4){

return null;

}

if (yearDate>=5000){

return null;

}
if(yearDate%4==0 && yearDate%100!=0){

return true;

}

if (yearDate%400==0){

return true;

}

return false;

}

}




enum CustMonthName{

JAN(1,"JAN"),

FEI(2,"FEI"),

MARCH(3,"MARCH"),

APERIL(4,"APERIL"),

MAY(5,"MAY"),

JUN(6,"JUN"),

JULY(7,"JULY"),

AUGOST(8,"AUGOST"),

SEPTEMBER(9,"SEPTEMBER"),

OCTOBER(10,"OCTOBER"),

NOMEMBER(11,"NOMEMBER"),

DESEMBER(12,"DESEMBER");
private Integer key;
private String desc;

private CustMonthName(Integer key,String desc){
    this.key=key;
    this.desc=desc;
}

public static String getDesc(Integer index){
    for (CustMonthName custMonthName: CustMonthName.values()){
        if(custMonthName.getKey()==index){
            return custMonthName.getDesc();
        }
    }
    return null;
}

public static Integer getKey(String desc){
    for (CustMonthName custMonthName : CustMonthName.values()){
        if (custMonthName.getDesc().equals(desc)){
            return custMonthName.getKey();
        }
    }
    return null;
}

public Integer getKey() {
    return key;
}

public void setKey(Integer key) {
    this.key = key;
}

public String getDesc() {
    return desc;
}

public void setDesc(String desc) {
    this.desc = desc;
}

}