传入当前日期获取下一天的日期【时隔2年，我抛弃数据结构和算法已经那么久了，真是不应该啊。我有罪。】

package God.froest.test1;

import java.util.Scanner;

class Day {
    private String year;
    private String month;
    private String day;

    public String getYear() {
        return year;
    }

    public void setYear(String year) {
        this.year = year;
    }

    public String getMonth() {
        return month;
    }

    public void setMonth(String month) {
        this.month = month;
    }

    public String getDay() {
        return day;
    }

    public void setDay(String day) {
        this.day = day;
    }

    Day(String year, String month, String day) {
        this.year = year;
        this.month = month;
        this.day = day;
    }

    public String toString() {
        return year + month + day;
    }
}

public class NextDay {
    /**
     * isLeap判断是否为闰年
     * @param day
     * @return
*/
    public Boolean isLeap(Day day) {
        int year = Integer.parseInt(day.getYear());
        return (year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0);
    }
    /**
     * nextDay传入当前日期，得到下一天日期,格式"yyyyMMdd"
     * @param day
     * @return
*/
    public Day nextDay(Day day) {
        int[] days = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        if (isLeap(day) && Integer.parseInt(day.getMonth()) == 2) {
            days[2] = 29;
        }
        int tempDay = Integer.parseInt(day.getDay());
        int tempMonth = Integer.parseInt(day.getMonth());
        int tempYear = Integer.parseInt(day.getYear());
        if (tempDay < days[tempMonth]) {
            String temp = "" + (tempDay + 1);
            if (tempDay + 1 < 10) {
                temp = "0" + temp;
                day.setDay(temp);
            } else {
                day.setDay(temp);
            }
        } else if (tempMonth != 12) {
            String temp = tempMonth + 1 + "";
            if (tempMonth + 1 < 10) {
                temp = "0" + temp;
                day.setMonth(temp);
                day.setDay("01");
            } else {
                day.setMonth(temp);
                day.setDay("01");
            }
        } else {
            day.setYear(tempYear + 1 + "");
            day.setMonth("01");
            day.setDay("01");
        }
        return day;
    }
    /**
     * isRightDate用于判断当前天的日期是否正确
     * @param day
     * @return
*/
    public Boolean isRightDate(Day day) {
        int[] days = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        if (isLeap(day) && Integer.parseInt(day.getMonth()) == 2) {
            days[2] = 29;
        }
        int tempDay = Integer.parseInt(day.getDay());
        int tempMonth = Integer.parseInt(day.getMonth());
        /**
         * 判断天数大于那个月的最大天数
*/
        if (tempDay > days[tempMonth]) {
            return false;
        }
        /**
         * 判断不是闰年，但是日期为29
*/
        if(!isLeap(day)&&day.getDay()=="29"){
            return false;
        }
        return true;
    }

    public static void main(String[] arg0) {
        Scanner scan = new Scanner(System.in);
        /**
         * 连续输入
*/
        while (true) {
            String date = scan.next();
            String year = date.substring(0, 4);
            String month = date.substring(4, 6);
            String day = date.substring(6, 8);

            NextDay dateUtil = new NextDay();
            Day start = new Day(year, month, day);
            if (!dateUtil.isRightDate(start)) {
                System.out.println("请输入正确的日期");
                continue;
            }
            Day nextDay = dateUtil.nextDay(start);
            System.out.println(nextDay);
        }
    }
}

这个获得下一天的日期算是我重新捡起算法的第一步吧。不管用什么语言，算法思想是不会变的。

                                                                     ------>froest