根据传入的日期和会员天数计算时间截止日期

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代码语言：javascript复制

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<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 && yearDate0!=0){
            return true;
        }
        if (yearDate@0==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;
    }
}

程序设计的实现思路在上面，编程代码的过程是需要使用数学知识和计算机的应用编程知识。代码质量的提高，数据返回正确性。魔鬼数字需要尽量避免。

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javaee

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