如何将用户输入添加到Java中的并行数组

Question

这是我现在拥有的代码，它是完全屠宰的。我有问题尝试允许字符串的用户输入和两个双打进入3个并行数组，然后保存到.txt文件。我不知道有人可以帮助我吗？

public static void addGames(int i, String[] array1, double[] array2, 
        double[] array3, int arrayLength, Scanner keyboard) throws IOException
{
    String newName;
    double newPrice;
    double newRating;
    if(i < arrayLength)
    {
        System.out.println("Please enter another game name: ");
        newName = keyboard.next();
        array1[i] = newName;
        System.out.println("Please enter another game price: ");
        newPrice = keyboard.nextDouble();
        array2[i] = newPrice;
        System.out.println("Please enter another game rating: ");
        newRating = keyboard.nextDouble();
        array3[i] = newRating;
        i++;
    }
    else
    {
        System.out.println("There is no more room to store games: ");
    }
    PrintWriter gamerOut = new PrintWriter("Project1_VideoGames.txt");
    while(i < array1.length)
    {
        gamerOut.write(array1[i]);
        gamerOut.add(array2[i]);
        gamerOut.add(array3[i]);
        i++;
    }
    gamerOut.close();
}

Answer 1

for (int j = 0; j < i; ++j) {
    gamerOut.println(array1[j] + "t" + array2[j] + "t" + array3[j]);

无需说名字对我来说太富有想象力。做一个

public class Game {
    String name;
    double price;
    double rating;
}

Answer 2

检查是否是您想要的。

我没有3个阵列，而是将所有内容都封装在Game类中。

public class Game {
    private String name;
    private double price;
    private double rating;
    public Game(String name, double price, double rating){
        this.name = name;
        this.price = price;
        this.rating = rating;
    }
    @Override
    public String toString(){
        String ret = "";
        ret = ret + name + " / " + price + " / " + rating;
        return ret;
    }   
}

这就是我为您的addGames函数所提供的。现在只需1个参数：您要在文件中写的游戏数。

public static void addGames(int gamesNumber) throws IOException
    {
        int i = 0;
        String newName;
        double newPrice, newRating;
        Scanner keyboard = new Scanner(System.in);
        ArrayList<Game> array = new ArrayList<Game>();
        while(i < gamesNumber)
        {
            System.out.println("Please enter another game name: ");
            newName = keyboard.next();
            System.out.println("Please enter another game price: ");
            newPrice = keyboard.nextDouble();
            System.out.println("Please enter another game rating: ");
            newRating = keyboard.nextDouble();
            System.out.println();
            Game game = new Game(newName, newPrice, newRating);
            array.add(game);
            i++;
        }
        System.out.println("There is no more room to store games. ");
        PrintWriter gamerOut = new PrintWriter("Project1_VideoGames.txt");
        i = 0;
        while(i < array.size())
        {
            gamerOut.println(array.get(i));
            i++;
        }
        gamerOut.close();
        System.out.println("The games have been written in the file");
    }

您可能想在阅读用户输入或处理FileWriter的异常时处理一些错误，但我将其留给您。

另外，我更改为PrintWriter#println方法而不是PrintWriter#write，并在Game类中覆盖toString方法。您可能也需要更改其实现。

希望这有所帮助。