第2次作业+105032014140

测试员代码链接 ：http://www.cnblogs.com/lingzhiliu/p/6600653.html

问题与建议： if...else 语句过多

package lib;

import java.util.Scanner;

public class nextDate {

    static String nextdate(int year, int month, int day) {

        // 闰年
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            if (month == 1 || month == 3 || month == 5 || month == 7
                    || month == 8 || month == 10) {

                if (day == 31) {
                    day = 1;
                    month++;
                } else
                    day++;

            } else if (month == 2) {
                if (day == 29) {
                    day = 1;
                    month++;
                } else
                    day++;

            } else if (month == 12) {
                if (day == 31) {
                    day = 1;
                    month = 1;
                    year++;
                } else
                    day++;
            } else if (month == 4 || month == 6 || month == 9 || month == 11) {
                if (day == 30) {
                    day = 1;
                    month++;
                } else
                    day++;
            }
        } else// 平年
        {
            if (month == 1 || month == 3 || month == 5 || month == 7
                    || month == 8 || month == 10) {

                if (day == 31) {
                    day = 1;
                    month++;
                } else
                    day++;

            } else if (month == 2) {
                if (day == 28) {
                    day = 1;
                    month++;
                } else
                    day++;

            } else if (month == 12) {
                if (day == 31) {
                    day = 1;
                    month = 1;
                    year++;
                } else
                    day++;
            } else if (month == 4 || month == 6 || month == 9 || month == 11) {
                if (day == 30) {
                    day = 1;
                    month++;
                } else
                    day++;
            }
        }
        String Year = year + "";
        String Month = month + "";
        String Day = day + "";

        return Year + "年" + Month + "月" + Day + "日";

    }

    public static void main(String[] args) {

        String tmp = "0";
        int month = 0, year = 0, day = 0;
        String date = " ";
        while (true) {
            Scanner sc = new Scanner(System.in);

            System.out.println("请输入日期(以1个空格区分年月日)");
            try {
                String str = sc.nextLine();
                String[] st = str.split(" ");
                year = Integer.parseInt(st[0]);
                month = Integer.parseInt(st[1]);
                day = Integer.parseInt(st[2]);
            } catch (Exception e) {
                System.out.print("输入有误重新输入");
                continue;
            }

            if (year < 1912 || year > 2050) {
                System.out.println("年份超过范围");
                continue;
            } else if (month > 12 || month < 1) {
                System.out.println("月份超过范围");
                continue;
            }
            // 日期有效判断
            else if (month == 1 || month == 3 || month == 5 || month == 7
                    || month == 8 || month == 10) {
                if (day > 31 || day < 1) {
                    System.out.println("日期超过范围");
                    continue;
                }

            } else if (month == 4 || month == 6 || month == 9 || month == 11) {
                if (day > 30 || day < 1) {
                    System.out.println("日期超过范围");
                    continue;
                }
            } else if (month == 2) {
                if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
                    if (day < 1 || day > 29) {
                        System.out.println("日期超过范围");
                        continue;
                    }
                } else {
                    if (day < 1 || day > 28) {
                        System.out.println("日期超过范围");
                        continue;
                    }
                }
            }
            date = nextdate(year, month, day);
            System.out.println("下一天是 ");
            System.out.print(date);
            System.out.println("\n是否停止 1 Or -1 -1为停止");
            tmp = sc.nextLine();

        }

    }

}

心得

　　增加了输入判定，输入错误会重新输入，对于覆盖判定和语句判定有了进一步的了解。