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\t状态\t名称\t\t借出日期\t\t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+"\t"+states[i]+"\t"+date[i]+"\t"+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！");
     }
 }