Java DVD管理项目

package com.project;

public class DVDSet {
    String[] name= new String[50];
    int[] State=new int[50];
    String[] date=new String[50];
    
}

package com.project;

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

public class DVDMgr {
    static DVDSet dvd=new DVDSet();
    static Scanner input=new Scanner(System.in);
    public static void main(String[] args) {
        
    }
    public void initial() {
        dvd.name[0]="罗马假日";
        dvd.name[1]="风声鹤唳";
        dvd.name[2]="浪漫满屋";
        
        dvd.State[0]=0;
        dvd.State[1]=1;
        dvd.State[2]=1;
        
        dvd.date[0]="2013-7-1";
                
    }
    public void search() {
        System.out.println("序号\t"+"状态\t"+"名称\t\t"+"借出日期");
        for(int i=0;dvd.name[i]!=null;i++) {
            int ii=i+1;
            System.out.print(ii+"\t");
            if(dvd.State[i]==0)
                System.out.print("已借出"+"\t");
            else
                System.out.print("可借"+"\t");
            System.out.print(dvd.name[i]+"\t"+"\t");
            System.out.println(dvd.date[i]);    
        }
    }
    public void add() {
        int a = 0;
        String name;
        for(int i=0;i<=50;i++) {
            if(dvd.name[i]==null) {
                a=i;
                break;
            }
        }
        System.out.println("请输入DVD名称");
        name=input.next();
        dvd.name[a]=name;
        dvd.State[a]=1;
        System.out.println("新增"+dvd.name[a]+"成功！");
    }
    public void delete() {
        System.out.println("请输入DVD名称");
        String name;
        int b=0,i=0,n=3,a=0;
        name=input.next();
        for(i=0;i<=49;i++) {
            if(dvd.name[i]!=null&&dvd.name[i].equalsIgnoreCase(name)&&dvd.State[i]==0) {
                System.out.println(dvd.name[i]+"为已借出状态，不能删除");
                n=1;
                break;
            }
            else if(dvd.name[i]!=null&&dvd.name[i].equalsIgnoreCase(name)&&dvd.State[i]==1) {
                a=i;
                while(dvd.name[a+1]!=null) {
                    dvd.name[a] = dvd.name[a+1];
                    dvd.State[a] = dvd.State[a+1];
                    dvd.date[a] = dvd.date[a+1];
                    a+=1;
                }
                dvd.name[a]=null;
                dvd.date[a]=null;
                System.out.println("DVD"+name+"删除成功");
                n=1;
                break;
            }    
        }
        if(n!=1) {
            System.out.println("无此书籍");
        }
    }
    public void set() {
        System.out.println("请输入DVD名称");
        String name,da;
        name=input.next();
        int i=0,n=3;
        for(i=0;i<=49;i++) {
                if(dvd.name[i]!=null&&dvd.name[i].equalsIgnoreCase(name)&&dvd.State[i]==1) {
                    System.out.println("请输入借出日期");
                    da=input.next();
                    System.out.println("DVD"+name+"借出成功");
                    dvd.State[i]=0;
                    n=1;
                    break;
                }
                else if(dvd.name[i]!=null&&dvd.name[i].equalsIgnoreCase(name)&&dvd.State[i]==0) {
                    System.out.println(name+"已经借出");
                    n=1;
                    break;
                }
        }
        if(n!=1) {
            System.out.println("未找到此DVD");
        }
    }
    public void ret() {
        System.out.println("请输入DVD名称");
        String name,returndate;
        name=input.next();
        int i=0,n=0;
        long chargee;
        for(i=0;i<=49;i+=1) {
            if(dvd.name[i]!=null&&dvd.name[i].equalsIgnoreCase(name)&&dvd.State[i]==0) {
                System.out.println("请输入归还日期");
                returndate=input.next();
                System.out.println("归还"+name+"成功");
                System.out.println("借出日期为"+dvd.date[i]);
                System.out.println("归还日期为"+returndate);
                chargee=charge(dvd.date[i],returndate);
                System.out.println("应付租金"+chargee);
                n=1;
                break;
            }
            else if(dvd.name[i]!=null&&dvd.name[i].equalsIgnoreCase(name)&&dvd.State[i]==1) {
                System.out.println("DVD"+name+"未借出，不需归还");
                n=1;
                break;
            }
        }
        if(n!=1)
            System.out.println("未找到此DVD");
    }
    public long charge(String dstr1, String dstr2) {
        long charge = 0;
        SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd"); // 格式化日期
        try {
                java.util.Date d1 =sd.parse(dstr1);
                java.util.Date d2 =sd.parse(dstr2);
                charge = (d2.getTime() - d1.getTime()) / (24 * 60 * 60 * 1000);
        } catch (ParseException e) {
                //e.printStackTrace();
        }
        return charge;
}
    
}

package com.project;

import java.util.Scanner;

public class Start {
    Scanner input=new Scanner(System.in);
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        DVDMgr mgr=new DVDMgr();
        mgr.initial();
        startMenu();
        returnMain();
    }
    public static void startMenu() {
        Scanner input=new Scanner(System.in);
        DVDMgr mgr=new DVDMgr();
        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");
        System.out.println("---------------------------------");
        System.out.println("请输入：");
        int i=input.nextInt();
        switch (i) {
        case 1:
            System.out.println("--->新增DVD");
            mgr.add();
            break;
        case 2:
            System.out.println("--->查看DVD");
            mgr.search();
            break;
        case 3:
            System.out.println("--->删除DVD");
            mgr.delete();
            break;
        case 4:
            System.out.println("--->借出DVD");
            mgr.set();
            break;
        case 5:
            System.out.println("--->归还DVD");
            mgr.ret();
            break;
        case 6:
            System.out.println("谢谢使用");
        default:
            System.out.println("您的输入有误，请查看后再次输入！");
            break;
        }
    }
    public static void returnMain() {
        Scanner input=new Scanner(System.in);
        System.out.println("输入0返回");
        int i=input.nextInt();
        if(i==0) 
             startMenu();    
             returnMain();
    }

}