DVD管理器

某音像店有一批DVD，通过对外出租DVD盈利。现在需要你为该店开发一 个迷你DVD管理器，实现DVD碟片的管理，包括如下功能： 新增DVD 查看DVD 删除DVD 借出DVD 归还DVD，并计算租金

DVD管理菜单，实现菜单切换

创建DVDMenu类

public class DVDMenu {
    Scanner input = new Scanner(System.in);
    DVDSet dvdSet = new DVDSet();

    /**
     * 显示菜单内容
     */
    public void showMenu(){
        System.out.print("\n");
        System.out.println("\t欢 迎 使 用 迷 你 DVD 管 理 器");
        System.out.println("------------------------------------------");
        System.out.println("\t\t\t1.新增DVD");
        System.out.println("\t\t\t2.查看DVD");
        System.out.println("\t\t\t3.删除DVD");
        System.out.println("\t\t\t4.借出DVD");
        System.out.println("\t\t\t5.归还DVD");
        System.out.println("\t\t\t6.排行榜");
        System.out.println("\t\t\t7.退  出");
        System.out.println("-------------------------------------------");
    }

    /**
     * 实现菜单选择
     * @return
     */
    public int startMenu() {
        int getNum;
        showMenu();
        System.out.print("请选择：");
        if (input.hasNextInt()) {
            getNum = input.nextInt();
            if (getNum >= 1 && getNum <= 7) {
                return getNum;
            } else {
                System.out.println("选择错误，请重新输入");
                return 00;
            }
        } else {
            String str = input.next();
            System.out.println("只能输入整数");
            return 00;
        }
    }

    /**
     * 返回主菜单
     */
    public int returnMain(){
        int choMenu;
        showMenu();
        System.out.print("请选择：");
        if (input.hasNextInt()){
            choMenu = input.nextInt();
            return choMenu;
        }else {
            String str = input.next();
            System.out.println("只能输入整数");
            return 00;
        }
    }
}

添加DVD信息，进行初始化，修改DVD信息

创建DVDMgr类

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

/**
 * @Desecription 添加DVD信息初始化，以及DVD信息修改
 * @Auther ZhengShouke
 * @Date 2020/7/17 13:36
 */
public class DVDMgr {
    DVDSet dvdSets = new DVDSet();
    Scanner input = new Scanner(System.in);

    /**
     * 对DVD信息进行初始化
     */
    public void initial() {
        //是否继续标识符
        boolean isGo = false;
        //输入错误标识符
        boolean no = false;
        //判断时间是否输入正确
        boolean getTime = false;
        int i = 0;
        while (!isGo) {
            System.out.print("请输入第" + (i + 1) + "张DVD的名称：");
            dvdSets.name[i] = input.next();
            //将名称左右的空格去掉
            dvdSets.name[i] = dvdSets.name[i].trim();
            /*String类型的字符串转换成StringBuffer类型的字符串
              以便于名称的统一*/
            StringBuffer nameBuffer = new StringBuffer(dvdSets.name[i]);
            for (int j = 0; j < 1; j++){
                nameBuffer.insert(j,'《');
            }
            nameBuffer.append("》");
            //再将StringBuffer类型的字符串转换为String类型
            dvdSets.name[i] = nameBuffer.toString();
            do {
                System.out.print("请输入第" + (i + 1) + "张DVD的租借状态(可租/已租出)：");
                dvdSets.state[i] = input.next();
                //判断输入的DVD的出租状态，若已租出则输入租出日期
                if ("已租出".equals(dvdSets.state[i])) {
                    do {
                        System.out.print("请输入第" + (i + 1) + "张租出日期(yyyy-MM-dd)：");
                        dvdSets.date[i] = input.next();
                        getTime = timeJudge(dvdSets.date[i]);
                        if (getTime){
                            dvdSets.rank[i]++;
                            break;
                        }else {
                            System.out.println("时间输入错误");
                        }
                    }while (!getTime);
                    no = false;
                }else if ("可租".equals(dvdSets.state[i])){
                    no = false;
                }else {
                    System.out.print("输入错误，");
                    no = true;
                }
            }while (no);
            i++;
            System.out.print("是否继续添加DVD信息？（Y/N）");
            isGo = isGoon();
        }
    }

    /**
     * 增加DVD信息
     */
    public void addDVD() {
        System.out.println("---->新增DVD");
        System.out.print("\n");
        boolean isGo = false;
        boolean no = false;
        boolean getTime = false;
        while (!isGo) {
            System.out.print("请输入要增加的DVD名称：");
            String name = input.next();
            for (int i = 0; i < dvdSets.name.length; i++) {
                //判断位置是否为空
                if (dvdSets.name[i] == null) {
                    dvdSets.name[i] = name;

                    /**
                     * 进行名称的统一
                     */
                    dvdSets.name[i] = dvdSets.name[i].trim();
                    StringBuffer nameBuffer = new StringBuffer(dvdSets.name[i]);
                    for (int j = 0; j < 1; j++){
                        nameBuffer.insert(j,'《');
                    }
                    nameBuffer.append("》");
                    dvdSets.name[i] = nameBuffer.toString();

                    do {
                        System.out.print("请输入DVD的租借状态(可租/已租出)：");
                        dvdSets.state[i] = input.next();
                        //判断输入的DVD的出租状态，若已租出则输入租出日期
                        if ("已租出".equals(dvdSets.state[i])) {
                            do {
                                System.out.print("请输入租出日期(yyyy-MM-dd)：");
                                dvdSets.date[i] = input.next();
                                getTime = timeJudge(dvdSets.date[i]);
                                if (getTime){
                                    dvdSets.rank[i]++;
                                    break;
                                }else {
                                    System.out.println("时间输入错误");
                                }
                            }while (!getTime);
                            no = false;
                        }else if ("可租".equals(dvdSets.state[i])){
                            no = false;
                        }else {
                            System.out.print("输入错误，");
                            no = true;
                        }
                    }while (no);

                    System.out.println("DVD" + dvdSets.name[i] + "信息增加成功");
                    break;
                }
            }
            System.out.print("是否继续增加DVD信息？（Y/N）：");
            isGo = isGoon();
            /*String no = input.next();
            if ("N".equals(no)) {
                isGo = true;
            }*/
        }
    }

    /**
     * 查看DVD信息
     */
    public void seeDVD() {
        System.out.println("---->查看DVD");
        System.out.print("\n");
        System.out.println("序号\t名称\t\t状态\t借出日期");
        int j = 1;
        for (int i = 0; i < dvdSets.name.length; i++) {
            if (dvdSets.name[i] != null) {
                System.out.print(j + "\t" + dvdSets.name[i] + "\t\t");
                if ("已租出".equals(dvdSets.state[i])) {
                    System.out.println(dvdSets.state[i] + "\t" + dvdSets.date[i]);
                } else {
                    System.out.println(dvdSets.state[i]);
                }
            }
            j++;
        }
        System.out.println("****************************************************");
        int num;
        do {
            System.out.print("输入0返回：");
            if (input.hasNextInt()){
                num = input.nextInt();
                if (num != 0){
                    System.out.println("输入错误，返回请输入0：");
                    num =1;
                }
            }else {
                String str = input.next();
                System.out.println("输入错误，返回请输入0：");
                num = 1;
            }
        }while (num == 1);
    }

    /**
     * 删除DVD信息
     */
    public void deleteDVD() {
        System.out.println("---->删除DVD");
        System.out.print("\n");
        //是否继续删除标识符
        boolean isGo = false;
        //是否删除成功标识符
        boolean complete = false;
        while (!isGo){
            System.out.print("请输入要删除的DVD名称：");
            String name = input.next();

            StringBuffer nameBuffer = new StringBuffer(name);
            for (int j = 0; j < 1; j++){
                nameBuffer.insert(j,'《');
            }
            nameBuffer.append("》");
            name = nameBuffer.toString();

            for (int i = 0; i < dvdSets.name.length; i++) {
                //判断DVD状态是否可租，可租的情况下可以删除
                if (name.equals(dvdSets.name[i]) && "可租".equals(dvdSets.state[i])) {
                    for (int j = i; j < dvdSets.name.length - 1; j++) {
                        //删除的位置后面的DVD信息依次前移一位
                        dvdSets.name[j] = dvdSets.name[j + 1];
                        dvdSets.state[j] = dvdSets.state[j + 1];
                        dvdSets.date[j] = dvdSets.date[j + 1];
                    }
                    //如果可以删除，则需将最后一个元素置空
                    dvdSets.name[dvdSets.name.length - 1] = null;
                    dvdSets.state[dvdSets.state.length - 1] = null;
                    dvdSets.date[dvdSets.date.length - 1] = null;
                    System.out.println("删除成功");
                    complete = true;
                    break;

                    //如果该DVD处于已出租状态则不能删除
                } else if (name.equals(dvdSets.name[i]) && "已租出".equals(dvdSets.state[i])) {
                    System.out.println("DVD" + dvdSets.name[i] + "已租出，不可删除");
                    complete = true;
                    break;
                } else {
                    complete = false;
                }
            }
            if (!complete){
                System.out.println("没有找到有关" + name + "DVD的信息");
            }
            System.out.print("是否继续删除DVD信息？（Y/N）：");
            isGo = isGoon();
            /*String no;
            do {
                no = input.next();
                if ("Y".equals(no)){
                    isGo = false;
                }else if ("N".equals(no)) {
                    isGo = true;
                }else {
                    System.out.println("输入错误，请重新选择：");
                }
            }while (!"Y".equals(no) || !"N".equals(no));*/
        }
    }

    /**
     * 借出DVD
     */
    public void lendDVD() {
        System.out.println("---->借出DVD");
        System.out.print("\n");
        boolean isGo = false;
        //租出成功标识符
        boolean complete = false;
        boolean getTime = false;
        while (!isGo){
            System.out.print("请输入要借的DVD名称：");
            String name = input.next();

            //同样进行名称的统一
            StringBuffer nameBuffer = new StringBuffer(name);
            for (int j = 0; j < 1; j++){
                nameBuffer.insert(j,'《');
            }
            nameBuffer.append("》");
            name = nameBuffer.toString();

            for (int i = 0; i < dvdSets.name.length; i ++){
                //判断是否为可租状态
                if (name.equals(dvdSets.name[i]) && "可租".equals(dvdSets.state[i])){
                    dvdSets.state[i] = "已租出";
                    do {
                        System.out.print("请输入租出日期(yyyy-MM-dd)：");
                        dvdSets.date[i] = input.next();
                        getTime = timeJudge(dvdSets.date[i]);
                        if (getTime){
                            dvdSets.rank[i]++;
                            break;
                        }else {
                            System.out.println("时间输入错误");
                        }
                    }while (!getTime);
                    dvdSets.date[i] = input.next();
                    dvdSets.rank[i]++;
                    System.out.println("借出成功");
                    complete = true;
                    break;
                }else if (name.equals(dvdSets.name[i]) && "已租出".equals(dvdSets.state[i])){
                    System.out.println("对不起，" + name + "已租出");
                    complete = true;
                    break;
                }else {
                    complete = false;
                }
            }
            if (!complete){
                System.out.println("没有找到有关" + name + "的信息");
            }
            System.out.print("是否继续借出DVD？（Y/N）：");
            isGo = isGoon();
        }
    }

    /**
     * 归还DVD
     */
    public void returnDVD(){
        System.out.println("---->归还DVD");
        System.out.print("\n");
        boolean isGo = false;
        boolean complete = false;
        boolean getTime = false;
        //归还日期
        String date;
        while (!isGo){
            System.out.print("请输入要归还的DVD名称：");
            String name = input.next();

            StringBuffer nameBuffer = new StringBuffer(name);
            for (int j = 0; j < 1; j++){
                nameBuffer.insert(j,'《');
            }
            nameBuffer.append("》");
            name = nameBuffer.toString();

            for (int i = 0; i < dvdSets.name.length; i++){
                if (name.equals(dvdSets.name[i]) && "已租出".equals(dvdSets.state[i])){
                    do {
                        System.out.print("请输入归还日期（yyy-MM-dd）：");
                        date = input.next();
                        getTime = timeJudge(date);
                        if (getTime){
                            if (date.compareTo(dvdSets.date[i]) > 0){
                                System.out.println("归还成功");
                                //调用租金计算方法
                                double money = getRent(dvdSets.date[i], date);
                                System.out.println("租金为：" + money + "元");
                                dvdSets.state[i] = "可租";
                                complete = true;
                                break;
                            }else {
                                System.out.println("归还日期不能早于借出日期");
                                complete = true;
                                getTime = false;
                            }
                        }else {
                            System.out.println("时间输入错误");
                            complete = true;
                            getTime = false;
                        }
                    }while (!getTime);
                }else if (name.equals(dvdSets.name[i]) && "可租".equals(dvdSets.state[i])){
                    System.out.println("DVD" + name + "没有外租，无法进行归还");
                    complete = true;
                    break;
                }/*else {
                    complete = false;
                }*/
            }
            if (!complete){
                System.out.println("没有找到有关" + name + "的信息");
            }
            System.out.print("是否继续归还DVD？（Y/N）：");
            isGo = isGoon();
        }
    }

    /**
     * 结算租金
     */
    public double getRent(String date1, String date2){
        double money = 0;
        //将日期字符串转换成Date
        SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
        try {
            Date d1 = sd.parse(date1);
            Date d2 = sd.parse(date2);
            money = (d2.getTime() - d1.getTime()) / (24 * 60 * 60 * 1000) / 10;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return money;
    }

    /**
     * 借出排行榜
     */
    public void getRank(){
        System.out.println("---->排行榜");
        System.out.print("\n");
        System.out.println("****************************************");
        System.out.println("次数\t名称");
        for (int i = 0; i < dvdSets.name.length - 1; i++){
            for (int j = i + 1; j < dvdSets.name.length; j++){
                if (dvdSets.rank[i] < dvdSets.rank[j]){
                    int temp = dvdSets.rank[j];
                    dvdSets.rank[j] = dvdSets.rank[i];
                    dvdSets.rank[i] = temp;
                    String name = dvdSets.name[j];
                    dvdSets.name[j] = dvdSets.name[i];
                    dvdSets.name[i] = name;
                    String state = dvdSets.state[j];
                    dvdSets.state[j] = dvdSets.state[i];
                    dvdSets.state[i] = state;
                    String date = dvdSets.date[j];
                    dvdSets.date[j] = dvdSets.date[i];
                    dvdSets.date[i] = date;
                }
            }
        }
        for (int i = 0; i < dvdSets.name.length; i++){
            if (dvdSets.name[i] != null){
                System.out.println(dvdSets.rank[i] + "\t" + dvdSets.name[i]);
            }
        }
        System.out.println("****************************************");

        int num;
        do {
            System.out.print("输入0返回：");
            if (input.hasNextInt()){
                num = input.nextInt();
                if (num != 0){
                    System.out.println("输入错误，返回请输入0：");
                    num =1;
                }
            }else {
                String str = input.next();
                System.out.println("输入错误，返回请输入0：");
                num = 1;
            }
        }while (num == 1);
    }

    /**
     * 判断是否继续的程序块
     */
    public boolean isGoon(){
        boolean isGo = false;
        String no;
        do {
            no = input.next();
            if ("Y".equals(no)){
                isGo = false;
            }else if ("N".equals(no)) {
                isGo = true;
            }else {
                System.out.println("输入错误，请重新选择：");
            }
        }while (!"Y".equals(no) && !"N".equals(no));
        return isGo;
    }

    /**
     * 时间输入判断
     * @param time
     * @return
     */
    public boolean timeJudge(String time) {
        //通过布尔值的返回，来判断时间格式是否正确
        boolean getTime = false;
        //yearDraw、monthDraw、dayDraw分别对应分开的年月日
        int yearDraw = Integer.parseInt(time.substring(0,4));
        int monthDraw = Integer.parseInt(time.substring(5,7));
        int dayDraw = Integer.parseInt(time.substring(8));
        if (time.length() == 10){
            if (yearDraw > 0 && yearDraw < 9999){
                if (monthDraw == 1 || monthDraw == 3 || monthDraw == 5 || monthDraw == 7
                        || monthDraw == 8 || monthDraw == 10 || monthDraw == 12){
                    if (dayDraw >= 1 && dayDraw <= 31){
                        getTime = true;
                        return getTime;
                    }
                }else if (monthDraw == 4 || monthDraw == 6 || monthDraw == 9
                        || monthDraw == 11 ){
                    if (dayDraw >= 1 && dayDraw <= 30){
                        getTime = true;
                        return getTime;
                    }
                    //判断2月天数
                }else if (monthDraw == 2){
                    if (yearDraw % 4 == 0){
                        if (dayDraw >= 1 && dayDraw <= 29){
                            getTime = true;
                            return getTime;
                        }
                    }else {
                        if (dayDraw >= 1 && dayDraw <= 28){
                            getTime = true;
                            return getTime;
                        }
                    }
                }
            }
        }
        return getTime;
    }
}

保存DVD信息 每张DVD的信息包括名称、是否可借的状态以及借出的日期

创建DVDSet类

/**
 * 保存DVD信息 每张DVD的信息包括名称、是否可借的状态以及借出的日期
 */
public class DVDSet {
    String[] name = new String[50]; //DVD名称数组
    String[] state = new String[50];  //DVD借出状态：0已借出/1可借
    String[] date = new String[50];  //DVD借出日期
    int[] rank = new int[50]; // DVD借出次数
}

编写测试类

/**
 * @Desecription TODO
 * @Auther ZhengShouke
 * @Date 2020/7/18 13:25
 */
public class TestDVD {
    public static void main(String[] args) {
        DVDSet dvdSet = new DVDSet();
        DVDMenu dvdMenu = new DVDMenu();
        DVDMgr dvdMgr = new DVDMgr();

        int choice;
        boolean isGo = false;

        dvdMgr.initial();
        while (!isGo){
            choice = dvdMenu.startMenu();
            switch (choice){
                case 1:
                    dvdMgr.addDVD();
                    break;
                case 2:
                    dvdMgr.seeDVD();
                    break;
                case 3:
                    dvdMgr.deleteDVD();
                    break;
                case 4:
                    dvdMgr.lendDVD();
                    break;
                case 5:
                    dvdMgr.returnDVD();
                    break;
                case 6:
                    dvdMgr.getRank();
                    break;
                case 7:
                    isGo = true;
                    break;
                default: ;
            }
        }
    }
}

运行效果

其余功能自行验证

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源码地址
提取码：m6q2

本文地址：https://blog.csdn.net/weixin_49757953/article/details/109643699