如何从Java中的对象数组列表中获取字符串？

Question

I am having the user input an index. That index will be used to find a particular object called Movie in the list array called movieList . In that object i want to find the value of genreOfMovie and convert it to String .

I am using this line of code:

Movie genreOfMovie = (Movie) movieList.get(Integer.parseInt(index) - 1);

to set the veritable to what the user is looking for.

However when i run the program I dont get a string of a genre , what i get is some thing similar to database.Movie@71aa1ce9 . Database if the name of the program and Movie is the name of the object so what is @71aa1ce9 and how do i change this like

Movie genreOfMovie = (Movie) movieList.get(Integer.parseInt(index) - 1); 

of code to print some sort of string like action because that is what was stored in there.

      String index  = TxtSearch.getText();
      Movie genreOfMovie = (Movie) movieList.get(Integer.parseInt(index) - 1);
      int counter = 0;
      do {
          counter++;
      } while (CbxGenres.getComponent(counter) != genreOfGame.toString());

Answer 1

You need to override the toString() method in your Movie class. Here, you can assemble a description of the object using its instance fields as well as any other String.

public class Movie {
    private String name;
    private String genre;

    ...

    @Override
    public String toString() {
        return genre;
        // alternatively, you can concatenate data into a String and return that, e.g. return name + " (" + genre + ")"
    }
}

On a side note, why doesn't your movieList have a generic type, eg List<Movie> ?

Answer 2

What you are doing is printing the String interpretation of the Movie object. What you want, is create your own string interpretation. You do this by overriding the toString() method in your movie object and returning the genre.

An example:

@Override
public String toString() {
   return this.genre;
} 

Answer 3

"@71aa1ce9" is name of object instance

Movie genreOfMovie = (Movie)

this is instance of one movie, to get genre you probably need to call some method on movie it self .. like .getGenre() or something like that