Java根据给定的日期计算其前一天和后一天的日期，java给定,package com.

Java根据给定的日期计算其前一天和后一天的日期，java给定,package com.

package com.xtgd.test;import java.io.BufferedReader;import java.io.InputStreamReader;public class Test {    public static void main(String[] args) {        try {            BufferedReader br = new BufferedReader(new InputStreamReader(                    System.in));            System.out.println("请输入年份");            String s1 = br.readLine();            System.out.println("请输入月份");            String s2 = br.readLine();            System.out.println("请输入日份");            String s3 = br.readLine();            int year = Integer.parseInt(s1);            int month = Integer.parseInt(s2);            int day = Integer.parseInt(s3);            if (year >= 0 && month >= 1 && month <= 12) {                if (month == 1 || month == 3 || month == 5 || month == 7                || month == 8 || month == 10 || month == 12) {                    if (day >= 1 && day <= 31) {                        System.out.println("您输入的日期为:" + year + "年" + month                                + "月"                                + day + "日");                        if (day == 31) {                            if (month == 12)                                System.out.println("且上一天为：" + year + "年12月"                                + (day - 1) + "日" + "," + "下一天为："                                + (year + 1) + "年1月1日");                            else                                System.out.println("且上一天为：" + year + "年"                                        + month                                        + "月" + (day - 1) + "日" + "," + "下一天为："                                        + year + "年" + (month + 1) + "月1日");                        } else if (day == 1) {                            if (month == 1)                                System.out.println("且上一天为：" + (year - 1)                                + "年12月31日" + "," + "下一天为：" + year + "年"                                + month + "月" + (day + 1) + "日");                            else if (month == 3) {                                if ((year % 4 == 0 && year % 100 != 0)                                || (year % 400 == 0))                                    System.out.println("且上一天为：" + year                                            + "年2月29日"                                            + "," + "下一天为：" + year + "年"                                            + month                                            + "月" + (day + 1) + "日");                                else                                    System.out.println("且上一天为：" + year                                            + "年2月28日"                                            + "," + "下一天为：" + year + "年"                                            + month                                            + "月" + (day + 1) + "日");                            } else                                System.out.println("且上一天为：" + year + "年"                                + (month - 1) + "月30日" + "," + "下一天为："                                + year + "年" + month + "月" + (day + 1)                                + "日");                        } else                            System.out.println("且上一天为：" + year + "年" + month                                    + "月"                                    + (day - 1) + "日" + "," + "下一天为：" + year                                    + "年"                                    + month + "月" + (day + 1) + "日");                    } else                        System.out.println("您输入的日期不合法");                } else if (month == 4 || month == 6 || month == 9                        || month == 11) {                    if (day >= 1 && day <= 30) {                        System.out.println("您输入的日期为:" + year + "年" + month                                + "月"                                + day + "日");                        if (day == 30)                            System.out.println("且上一天为：" + year + "年" + month                                    + "月"                                    + (day - 1) + "日" + "," + "下一天为：" + year                                    + "年"                                    + (month + 1) + "月1日");                        else if (day == 1)                            System.out.println("且上一天为：" + year + "年"                                    + (month - 1)                                    + "月31日" + "," + "下一天为：" + year + "年"                                    + month                                    + (day + 1) + "日");                        else                            System.out.println("且上一天为：" + year + "年" + month                                    + "月"                                    + (day - 1) + "日" + "," + "下一天为：" + year                                    + "年"                                    + month + (day + 1) + "日");                    } else                        System.out.println("您输入的日期不合法");                } else if ((year % 4 == 0 && year % 100 != 0)                        || (year % 400 == 0)) {                    if (day == 29)                        System.out.println("您输入的日期为:" + year + "年" + month                                + "月"                                + day + "日" + "n" + "且上一天为：" + year + "年2月28日"                                + "," + "下一天为：" + year + "年3月1日");                    else {                        if (day == 28)                            System.out.println("您输入的日期为:" + year + "年" + month                            + "月" + day + "日" + "n" + "且上一天为：" + year                            + "年2月27日" + "," + "下一天为：" + year + "年2月29日");                        else                            System.out.println("您输入的日期不合法");                    }                }            } else {                System.out.println("您输入的日期不合法");            }        } catch (Exception e) {            e.printStackTrace();        }    }}