我将如何接受用户输入并将其添加到arraylist中？

Question

I have currently written a class called PostTUI and I need to know if I could take the input people write from my scanner and add it into my arraylist.

public class PostTUI {

    private Scanner scan = new Scanner(System.in);
    private PostManager manager;
    private String userChoice;
    private String author;
    private String message;

    public PostTUI(PostManager manager) {
        this.manager = new PostManager();
    }
    public void run() {
        System.out.println("1 - Create a new Message Post");
        System.out.println("2 - Create a new Photo Post");
        System.out.println("3 - Create a new Event Post");
        this.userChoice = this.scan.nextLine();

        if (this.userChoice.equals("1")) {
            System.out.println("Who is the author?");
            this.author = this.scan.nextLine();
            System.out.println("What is the message?");
            this.message = scan.nextLine();
            this.manager.addPost(Post newPost);
        }

    }
}

The PostManager class is the class who's job it is to declare and initialize the arraylist. It has a method that accepts and stores a post (addPost) and a toString method.

Answer 1

You haven't made it explicitly clear where you use an ArrayList , but presumably inside the PostManager and you add to it with the add() method. In any case, that's not how you create a new object, which is why the last line is giving you an error message. You want this instead:

this.manager.addPost(new Post());

You haven't shown us the Post class, but maybe you want to pass the author and message String s as arguments to the Post constructor?