图书管理系统代码

import java.util.Scanner;
public class Start {
    public DVDSet dvd = new DVDSet();
    public DVDMgr DVDMgr=new DVDMgr();
    public int i=3;
    public void main(String[] args) {

        for(int n=0;n
                    case 2 ->DVDMgr.search(dvd);
                    //case 6 ->{break;}
                }
            }
            else {
                System.out.println("输入错误，请重新输入");
            }
            System.out.println("输入0返回");
            while(true) {
                m = input.nextInt();
                if (m == 0) {
                    returnMain();
                    break;
                } else {
                    System.out.println("输入错误，请重新输入");
                }
            }
        }
    }

    public void returnMain(){
        startMenu();
    }
}

import java.util.Scanner;
public class DVDMgr {
    public String initial() {
        Scanner input = new Scanner(System.in);
            String str;
            str= input.next();
            return str;
    }
    public void search(DVDSet dvd){
        System.out.println("序号      状态       名称             借出日期");
        int i=0;
        while(dvd.name[i]!=null){
            System.out.println("" + (i+1) + "        " + dvd.state[i] + "        "+dvd.name[i]+"        "+dvd.date[i]);
            i++;
        }
    }
}

public class DVDSet {
    public String[] name=new String[50];
    public String[] state=new String[50];
    public String[] date=new String[50];

}