Question

我正在尝试从我的Movie class中读取一个对象数组中的文件，然后打印结果。

public class Movie_Class {
  private int MovieID;
  private String MovieTitle;
  private String Director;
  private String Writer;
  private String Duration;
  private String Genre;
  private String Classification;
  private String ReleaseDate;
  private Double Rating;

  public Movie_18512117(int ID, String Title, String Mdirector, String  Mwriter,
 String Mduration, String Mgenre, String Mclassification, String MreleaseDate, Double  Mrating) {

    MovieID = ID;
    MovieTitle= Title;
    Director= Mdirector;
    Writer= Mwriter;
    Duration= Mduration;
    Genre= Mgenre;
    Classification= Mclassification;
    ReleaseDate= MreleaseDate;
    Rating= Mrating;
  }

  public int  getMovieID(){
    return MovieID;
  }

  public String getMovieTitle(){
    return MovieTitle;
  }

  public String getDirector(){
    return Director;
  }

  public String getWriter(){
    return Writer;
  }

  public String getDuration(){
    return Duration;
  }

  public String getGenre(){
    return Genre;
  }

  public String getClassification(){
    return Classification;
  }

  public String getReleaseDate(){
    return ReleaseDate;
  }

  public Double  getRating(){
    return Rating;
  }

  public void setMovieID(int MovieID) {
    this.MovieID = MovieID;
  }

  public void  setMovieTitle(String MovieTitle){
    this.MovieTitle = MovieTitle;
  }

  public void  setDirector(String Director) {
    this.Director = Director;
  }

  public void  setWriter(String Writer) {
    this. Writer =  Writer;
  }

  public void  setDuration(String Duration) {
    this. Duration =  Duration;
  }

  public void  setGenre(String Genre) {
    this.Genre = Genre;
  }

  public void  setClassification(String Classification){
    this.Classification = Classification;
  }

  public void  setReleaseDate(String ReleaseDate){
    this.ReleaseDate = ReleaseDate;
  }

  public void  setRating(Double Rating){
    this.Rating = Rating;
  }
}

import java.io.File;
import java.util.Scanner;
import java.io.FileNotFoundException;

public class movie {
  public static void main(String[] args) throws FileNotFoundException {
    File myFile = new File ("movieLibrary.txt");
    Scanner inputFile = new Scanner(myFile);
    String str;
    Movie_Class[] movie = new Movie_Class[100];
    String[] tokens;

    while (inputFile.hasNext()){
      str=inputFile.next();
      tokens = str.split(",");
      for(int i = 0; i < movies.length; i++){
        movie[i] = new Movie_18512117(1);

//I don't know how to read the lines in to //my array and split the spaces, then print the result.

        System.out.println(movie);
      }
    }
    inputFile.close();
  }
}

Answer 1

如果要像您一样迭代输入流，请尝试使用BufferedReader和FileReader类而不是扫描程序。在链接中是一个有用的教程如何执行此操作：

https://www.mkyong.com/java/how-to-read-file-from-java-bufferedreader-example/

另外，您可以使用＆＃34; .split（正则表达式）＆＃34;用于进一步处理来自文件的传入信息的方法。（例如，在String.split（＆＃34; \ s +＆＃34;）;）

的空格上拆分

至于向阵列添加信息;您可以尝试使用ArrayList及其.add（）方法，而不是现在使用的对象数组。

Answer 2

Movie_Class的构造函数方法应该是public Movie_Class，而不是public Movie_18512117。这是第一个错误。详细了解constructors。然后，您可以通过调用

创建一个新的Movie_Class对象

movie[i] = new Movie_Class(...);

在构造函数中，您必须输入电影的所有细节，而不仅仅是ID。如果要创建仅包含ID的影片对象，则应定义仅使用ID作为输入值的新构造函数，如下所示

public Movie_Class (int ID) {
  // Do whatever you want
}

如果要添加对象，可以使用ArrayList而不是Array，而不知道应该存储在其中的确切元素数。阅读 ArrayLists 和其他集合 here。首先尝试修复这些错误。然后你可以继续。

无法将txt文件读入对象数组，然后打印出结果

2 个答案: