java数组实现简单的DVD管理

package com;

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

public class Demo{
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        
        String[] names = new String[10];
        String[] states = new String[10];
        String[] date = new String[10];
        int[] counts = new int[10];
        
        names[0]="罗宁";
        states[0]="可借";
        
        names[1]="死亡之翼";
        states[1]="可借";
        
        names[2]="国王之谷";
        states[2]="可借";
        
        names[3]="闪光平原";
        states[3]="可借";
        
        String isBack = "";
        
        do{
        System.out.println("欢迎使用迷你DVD管理系统");
        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.println("请选择：");
        int choose = input.nextInt();
        
        if(choose == 6){
            break;
        }
        
        switch(choose){
            case 1:
                System.out.println("--->新增DVD");
                //定义保存信息的下标
                int index1=-1;
                for(int i = 0;i<names.length;i++){
                    if(names[i]==null){
                        index1=i;
                        break;
                    }
                }
                //判断是否可以保存
                if(index1==-1){
                    System.out.println("保存满了，请稍候再试");
                }else{
                    System.out.println("请输入新增DVD名称!");
                    String name = input.next();
                    
                    names[index1]=name;
                    states[index1]="可借";
                    
                    System.out.println("增加成功-_-!");
                }
                
                break;
            case 2:
                System.out.println("--->查看DVD");
                int count = 1;
                
                System.out.println("序号	状态	名称		借出日期		借出次数");
                for(int i = 0;i<names.length;i++){
                    if(date[i]==null){
                        date[i]="";
                    }
                    if(names[i]==null){
                        continue;
                    }
                    System.out.println();
                    System.out.println(count+"	"+states[i]+"	"+date[i]+"	"+counts);
                    count++;
                }
                break;
            case 3:
                System.out.println("--->删除DVD");
                System.out.println("请输入要删除DVD的名称：");
                String delName=input.next();
                
                int index3 = -1;
                for(int i = 0;i<names.length;i++){
                    if(delName.equals(names[i])){
                        if("可借".equals(states[i])){
                            index3=i;
                            break;
                        }
                        index3=-2;
                        break;
                    }
                }
                if(index3==-1){
                    System.out.println("输入的DVD信息不存在，请重新输入！！！！");
                }else if(index3==-2){
                    System.out.println("该DVD已借出，不能删除!!!");
                }
                else{
                    names[index3]=null;
                    System.out.println("删除成功！！！");
                }
                break;
            case 4:
                System.out.println("--->借出DVD");
                System.out.println("请输入要借的DVD名称：");
                String borrowName = input.next();
                
                int index4=-1;
                
                //循环遍历该DVD是否存在
                for(int i = 0;i<names.length;i++){
                    if(borrowName.equals(names[i])){
                        if("可借".equals(states[i])){
                            index4=i;
                            break;
                        }
                        index4=-2;
                        break;
                    }
                }
                if(index4==-1){
                    System.out.println("输入的DVD信息不存在！！！");
                }else if(index4==-2){
                    System.out.println("该DVD已借出！");
                }else{
                    Date d =new Date();
                    SimpleDateFormat df=new SimpleDateFormat();
                    String dateStr=df.format(d);
                    
                    states[index4]="已借出";
                    date[index4]=dateStr;
                    counts[index4] = counts[index4]+1;
                    System.out.println("借出成功！");
                }
                break;
            case 5:
                System.out.println("--->归还DVD");
                System.out.println("请输入要归还的DVD名称：");
                String backName=input.next();
                
                int index5=-1;
                for(int i = 0;i<names.length;i++){
                    if(backName.equals(names[i])){
                        if("已借出".equals(states[i])){
                            index5=i;
                            break;
                        }
                        index5=-2;
                        break;
                    }
                }
                if(index5==-1){
                    System.out.println("该DVD不存在，不能归还！");
                }else if(index5==-2){
                    System.out.println("该DVD未借出，无法归还！");
                }else{
                    states[index5]="可借";
                    date[index5]="";
                    System.out.println("归还成功!");
                }
                break;
                
        }
        System.out.println("****************************");
        System.out.println("输入0返回");
        isBack=input.next();
        }
        while(isBack.equals("0"));
        System.out.println("谢谢使用！");
    }
}