迷你DVD管理器项目

package chapter5;
import java.util.*;

public class MiniDVD {
    public static void main(String[] args){
        //扫描器
        Scanner input = new Scanner(System.in);
        //重要参数及初始化
        //Create four arrays with length of 7
        //定义四个数组长度为7
        int date[] = new int[7];            //borrow date
        int count[] = new int[7];            //total count
        String name[] =new String[7];        //name of DVDs
        String state[] = new String[7];        //state
        //Initiate three DVD
        //FirstDVD
        name[0] = "罗马假日";
        state[0] = "已借出";
        date[0] = 1;
        count[0] =15;
        //Second DVD
        name[1] = "风声鹤唳";
        state[1] = "可借";
        date[1] = 0;
        count[1] =12;
        //Third DVD
        name[2] = "浪漫满屋";
        state[2] = "可借";
        date[2] = 0;
        count[2] =30;
        
        //循环进入条件
        String choice = " ";
        boolean flag = true;
        do{
            //Create DVD Menu
            System.out.println("欢迎使用迷你DVD管理器");
            System.out.println("------------------------------------------------------");
            System.out.println("1.新增DVD");
            System.out.println("2.查看DVD");
            System.out.println("3.删除DVD");
            System.out.println("4.借出DVD");
            System.out.println("5.归还DVD");
            System.out.println("6.退出DVD");
            System.out.println("------------------------------------------------------");
            System.out.print("请选择：");
            choice = input.next();
            
            //Switch choice menu
            switch (choice){
                case "1":
                    System.out.println("--->新增DVD");
                    System.out.print("
请输入DVD名称：");
                    boolean firstMonitor = true;
                    boolean secondMonitor = false;
                    String bookName = " ";
                    do{
                        bookName= input.next();
                        if(firstMonitor){
                            for(int i = 0; i<name.length; i++){
                                if(bookName.equals(name[i])){
                                    System.out.println("货架上已经存在该DVD，请返回目录重新选择！");
                                    secondMonitor = true;
                                    break;
                                }
                            }
                        }
                        firstMonitor =false;
                    }while(firstMonitor);
                    
                    if(!secondMonitor){
                        for (int j = 0;j<name.length; j++){
                            if((name[j])==null){
                                name[j]= bookName;
                                state[j] = "可借";
                                count[j] = 0;
                                System.out.println("新增《"+bookName+"》成功！");
                                System.out.println("***************************");
                                break;
                            }
                            if(name[name.length-2] !=null){
                                System.out.println("DVD货架已满，添加失败！");
                                System.out.println("***************************");
                                break;
                            }
                        }
                    }
                    break;
                case "2":
                    System.out.println("--->查看DVD");
                    System.out.println("序号	状态	名称		借出日期	借出次数");
                    for (int i = 0; i<name.length; i++){
                        if(name[i] == null){
                            System.out.println("***************************");
                            break;
                        }
                        String myDate = " ";
                        if(date[i] != 0){
                            myDate = date[i]+"日";
                        }
                        System.out.println((i+1)+"	"+state[i]+"	"+"《"+name[i]+"》"+"	"+myDate+"	"+count[i]+"次");                            
                    }
                    break;
                case "3":
                    System.out.println("--->删除DVD");
                    System.out.print("
请输入DVD名称：");
                    String delName = input.next();
                    //define index monitor: check
                    int check = -1;
                    for(int i = 0; i < name.length; i++){
                        if(delName.equals(name[i])){
                            check = i;
                            break;
                        }
                    }
                    if(check != -1){
                        if(state[check].equals("可借")){
                            //Delete operation
                            for(int j = check; j < name.length-1; j++){
                                name[j] = name[j+1];
                                state[j] = state[j+1];
                                date[j] = date[j+1];
                                count[j] = count[j+1];
                            }
                            System.out.println("删除《"+delName+"》成功！");
                            System.out.println("***************************");
                            break;
                        }else{
                            System.out.println("DVD为借出状态，不允许删除！");
                            System.out.println("***************************");
                        }
                    }else{
                        System.out.println("没有找到匹配信息！");
                        System.out.println("***************************");
                    }
                    break;
                case "4":
                    System.out.println("--->借出DVD");
                    System.out.print("
请输入DVD名称：");
                    String lendName = input.next();
                    //Initiate lendDate with 1, so as to enter the do-loop
                    int lendDate = 1;
                    System.out.print("请输入借出日期：");
                    //Avoid user input wrong date
                    do{
                        lendDate = input.nextInt();
                        if((lendDate<1)||(lendDate>31)){
                            System.out.print("必须输入大于等于1且小于等于31的数字，请重新输入：");
                        }
                    }while((lendDate<1)||(lendDate>31));
                    
                    //define index monitor
                    int index = -1;
                    for(int i = 0; i < name.length; i++){
                        if(lendName.equals(name[i])){
                            index = i;
                            break;
                        }
                        
                    }
                    //lend operation
                    if(index != -1){
                        if(state[index].equals("可借")){
                            state[index] = "已借出";
                            count[index] +=1;
                            date[index] = lendDate;
                            System.out.println("借出《"+lendName+"》成功！");
                            System.out.println("***************************");
                        }else{
                            System.out.println("《"+lendName+"》已被借出！");
                            System.out.println("***************************");
                        }
                    }else{
                        System.out.println("没有找到匹配信息！");
                        System.out.println("***************************");
                    }
                    break;
                case "5":
                    System.out.println("--->归还DVD");
                    System.out.print("
请输入DVD名称：");
                    String returnName = input.next();
                    //define index monitor
                    int monitor = -1;
                    for(int i = 0; i < name.length; i++){
                        if(returnName.equals(name[i])){
                            monitor = i;
                            break;
                        }
                        
                    }
                    //Initiate myLendPeriod with 0, and enter the do-loop
                    int returnDate = 0;
                    int myLendPeriod = 0;
                    do{
                        System.out.print("请输入归还日期：");
                        //Avoid user input wrong date
                        do{
                            returnDate = input.nextInt();
                            if(monitor != -1){
                                myLendPeriod = returnDate - date[monitor];
                            }
                            if(returnDate > 31){
                                System.out.print("一个月只有31天，请重新输入：");
                            }
                            if(myLendPeriod < 0){
                                System.out.println("归还日期不能小于借出日期，请重新输入：");
                            }
                        }while((returnDate>31)||(myLendPeriod<0));
                        //Return operation
                        if(monitor != -1){
                            if(state[monitor].equals("已借出")){
                                state[monitor] = "可借";
                                date[monitor] = 0;
                                System.out.println("归还《"+returnName+"》成功！");
                                System.out.println("借出日期为："+date[monitor]+"日");
                                System.out.println("归还日期为："+returnDate+"日");
                                System.out.println("应付租金（元）："+myLendPeriod);
                                System.out.println("***************************");
                            }else{
                                System.out.println("该DVD没有被借出！无法进行归还操作。");
                                System.out.println("***************************");
                            }
                        }else{
                            System.out.println("没有找到匹配信息！");
                            System.out.println("***************************");
                        }
                        break;
                    }while(myLendPeriod < 0);
                    break;
                case "6":
                    flag = false;
                    break;
                default:
            }
            if(flag){
                System.out.print("输入任意值返回:");
                choice = input.next();
            }
        }while(flag);
        
        //program exit
        System.out.println("程序结束");
    }
}