电影数据库java错误

Question

所以我需要使用具有属性名称，评级，导演，年份和毛泽东的java创建电影数据库。该程序还必须添加电影，按标题删除电影，按标题排序电影，按评级排序电影，按Box Office Gross排序电影，由导演显示电影，打印到数据库文件（您可以定义自己的协议）和从数据库文件中读取。我遇到ArrayList <Movie>的错误，它说它无法解析为某种类型，因此每当调用Movie时都会给我错误。

这是给出错误的块

ArrayList<Movie> movieDB = new ArrayList<Movie>();
int choice;
Scanner input = new Scanner(System.in);
String mvname, director, fileName;
int year;    
double rating, gross;

这是我到目前为止的代码

import java.awt.List;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
public class MovieDatabase 
{
     public static void main(String[]args) throws Exception
     {
          ArrayList<Movie> movieDB = new ArrayList<Movie>();
          int choice;

          Scanner input=new Scanner(System.in);
          String mvname,director,fileName;
          int year;    
          double rating,gross;
          while(true)
          {
              //menu
              System.out.println("1.Add a movie\n2.Remove a moive\n3.Sort movie by Title\n4.Sort movie by Rating");
              System.out.println("5.Sort movie by Box office Gross\n6.Show movies by a director");
              System.out.print("7.Print to a database file\n8.Read from a database file\n9.exit: ");
              choice=input.nextInt();

              switch(choice)
              {
                   case 1: System.out.println("Enter movie name: ");
                             mvname=input.next();
                             System.out.println("Enter year: ");
                             year=input.nextInt();
                             System.out.println("Enter Director name: ");
                             director=input.next();
                             System.out.println("Enter movie rating: ");
                             rating=input.nextDouble();
                             System.out.println("Enter Box Office Gross: ");

                             gross=input.nextDouble();
                             //add new moive object ot movie data base
                             movieDB.add(new Movie(mvname,year,rating,director,gross));
                             break;

                   case 2:   System.out.println("Enter movie title: ");
                             mvname=input.next();
                             //remove specified movie object by title
                             for(Movie m:movieDB)
                             {
                                  if(mvname.equals(m.getMovie_name()))
                                  {
                                      movieDB.remove(m);
                                  }
                             }
                             break;

                   case 3: //Sort the movie data records by movie title
                             Collections.sort(movieDB,Movie.titleComparator);
                             System.out.println("After sorting by title");
                             for(Movie m:movieDB)
                             {
                                  System.out.println(m.toString());
                             }
                             break;

                   case 4: //Sort the movie data records by movie rating
                             Collections.sort(movieDB,Movie.rateComparator);
                             System.out.println("After sorting by rating");
                             for(Movie m:movieDB)
                             {
                                  System.out.println(m.toString());
                             }
                             break;

                   case 5: //Sort the movie data records by movie gross
                             Collections.sort(movieDB,Movie.grossComparator);
                             System.out.println("After sorting by gross");
                             for(Movie m:movieDB)
                             {
                                  System.out.println(m.toString());
                             }
                             break;

                   case 6: //display movies by director name
                             System.out.println("Enter Director name: ");
                             director=input.next();
                             for(Movie m:movieDB)
                             {
                                  if(director.equals(m.getMovie_Director()))
                                  {
                                      System.out.println(m.toString());
                                  }
                             }
                             break;

                   case 7: //print movie data records to a text file
                             System.out.println("Enter File name: ");
                             fileName=input.next();
                             FileWriter fWriter = null;
                             BufferedWriter writer = null;
                             fWriter = new FileWriter(fileName+".txt",true);
                             writer = new BufferedWriter(fWriter);
                             for(Movie m:movieDB)
                             {
                                  writer.write(m.toString());
                                  System.out.println(m.toString());
                             }
                             break;

                   case 8:
                             //read movie data records from a text file
                             System.out.println("Enter File name: ");
                             fileName=input.next();
                             BufferedReader br = new BufferedReader(new FileReader(fileName+".txt"));
                             String line;
                             while((line = br.readLine()) != null)
                             {
                                  System.out.println(line);
                                  String lines[]=line.split(" ");
                                  mvname=lines[0];
                                  year=Integer.parseInt(lines[1]);
                                  rating=Double.parseDouble(lines[2]);
                                  director=lines[3];
                                  gross=Double.parseDouble(lines[4]);
                                  movieDB.add(new Movie(mvname,year,rating,director,gross));
                             }
                             br.close();

                             break;

                   case 9:System.exit(1);
                   default: System.out.println("Wrong Choice!");
              }
          }
     }
}       

Answer 1

您错误拼写了下面的课程名称电影

ArrayList<Movie> movieDB = new ArrayList<Moive>();

尝试此操作并告知我们是否仍然因错误而失败。