java - 如何让用户选择任何电影

Question

我的程序是关于用户从列出的 7 部电影中选择一部电影或许多人想要观看的电影以及显示的价格。该程序将为用户提供 7 部电影可供选择，如果他们想选择另一部电影，价格将加到总数中。到目前为止，我有一系列电影和价格，但我不确定应该如何为电影做出用户选择并添加总价格。我应该使用 switch 语句还是循环我很困惑。这是我到目前为止所拥有的:

import java.util.Scanner;
public class MovieHits {

public static void main(String[] args) 
{
    //Declare Variables
    Scanner keyboard = new Scanner(System.in);
    int userChoice = 0;
    String [] Movie = new String [7];

    int [] movieCost ={ 5, 4, 3, 6, 4, 4, 3}; 

    Movie [0] = "Iron Man";
    Movie [1] = "Transformers";
    Movie [2] = "Godzilla";
    Movie [3] = "Fast and Furious";
    Movie [4] = "Captain America";
    Movie [5] = "X Men";
    Movie [6] = "Rio";

    //Welcome the user
    System.out.println("Hello, Welcome to TC Movies OnDemand.");

    //Display the listed movies so the user can know with movie they want to watch
    System.out.println("\nChoose which movie you want to watch: ");
    for ( int index = 0; index < 7; index = index + 1 ) 
    {
        System.out.println(Movie[index]); 
        System.out.println("\t" + "Price: $" + movieCost[index]);
    }

    //Switch Statement to give user a menu to choose a movie
    switch (userChoice)
    {
    case 1: 
        System.out.println("The movie you have chosen.");
        break;

Answer 1

您应该使用循环来打印电影选择。读取用户输入后，您可以使用 switch case 来确定选择了哪部电影。您的示例代码实际上并不读取用户输入，实例化的 Scanner 对象从未被使用。在开关盒之前，您应该有例如

userChoice = keyboard.nextInt();

但是，有一种更面向对象的“Java 方式”可以使用 Map 而不是 String 数组来完成此操作，并且无需使用 switch-case:

public class MovieHits {
public static class Movie {
    private int cost;
    private String name;

    public Movie(String name, int cost) {
        this.cost = cost;
        this.name = name;
    }

    public int getCost() {
        return cost;
    }

    public String getName() {
        return name;
    }
}

public static void main(String[] args) {

    //Declare Variables
    Scanner keyboard = new Scanner(System.in);
    int userChoice;
    Map<Integer, Movie> movies = new HashMap<Integer, Movie>();
    movies.put(1, new Movie("Iron Man", 5));
    movies.put(2, new Movie("Transformers", 4));
    movies.put(3, new Movie("Godzilla", 3));
    // ...

    //Welcome the user
    System.out.println("Hello, Welcome to TC Movies OnDemand.");

    //Display the listed movies so the user can know with movie they want to watch
    System.out.println("\nChoose which movie you want to watch: ");
    Set<Integer> keys = movies.keySet();
    for (Integer key : keys) {
        Movie movie = movies.get(key);
        System.out.println(key + ": " + movie.getName());
        System.out.println("\t" + "Price: $" + movie.getCost());
    }
    userChoice = keyboard.nextInt();
    System.out.println("You have chosen " + movies.get(userChoice).getName());

内部类通常违背最佳实践，但在本例中我使用它来保持简单。

如果用户可以选择多个电影，则在 while 循环中读取 userChoice 并用特定数字或用户输入空行来中断它。在循环内存储选定的电影，例如在列表中，计算用户在循环内或选择所有想要的电影后观看的总价格。