Question

每当我尝试为我的数组创建一个方法时，我在包含的行上都会出错 (int i =0; i < list.length; i++)。 list.length下会显示一条红线，但是当我没有将其放在方法下时，就没有错误。我该如何解决？我需要使用一种方法。

public static void main(String[] args)

{
    System.out.println("Sergio Borja, Class Meeting Time: Tue/Thu 1:30-2:50pm");
    Movie[] list = new Movie[6];
    list[0] = new Animated("Batman Begins", "Zack Snyder" , 2006, 4000000000.0, 4, 3000.0);
    list[1] = new Animated("Batman v Superman", "Jack Smith", 2016, 250200.0, 3, 20000.0);
    list[2] = new Documentary("The Lone Ranger", "Spike Lee", 2002, 2000000.0, 1000, 4000.0);
    list[3] = new Documentary("Cowboys", "Bob lies", 1992, 5000000.0, 1050 , 2000.0);
    list[4] = new Drama ("Karate Kid","Jackie Chan", 1998, 2000000000.0, 60000000.0, 15.25);
    list[5] = new Drama ("The Amazing SpiderMan", "Bobby Smith", 2014, 150000000.0, 20000000.0, 14.50);

}
    public void printMovieInfo(Movie[] Movie)
    {
        for (int i =0; i < list.length; i++){
            System.out.printf("%s", list[i].toString());
    }
}

Answer 1

您传入名为Movie的数组（也是class的名称），但尝试使用名为list的数组。变化

public void printMovieInfo(Movie[] Movie)

到

public void printMovieInfo(Movie[] list)

Answer 2

printMovieInfo不知道list。将其替换为正确的参数名称，即Movie（并在工作后用小写重命名）。

Answer 3

您的 list 变量位于main方法中，printMovieInfo方法无法看到该方法。使用你的论证中的电影变量。另外，从主要添加printMovieInfo调用。

public static void main(String[] args)

{
    System.out.println("Sergio Borja, Class Meeting Time: Tue/Thu 1:30-2:50pm");
    Movie[] list = new Movie[6];
    list[0] = new Animated("Batman Begins", "Zack Snyder" , 2006, 4000000000.0, 4, 3000.0);
    list[1] = new Animated("Batman v Superman", "Jack Smith", 2016, 250200.0, 3, 20000.0);
    list[2] = new Documentary("The Lone Ranger", "Spike Lee", 2002, 2000000.0, 1000, 4000.0);
    list[3] = new Documentary("Cowboys", "Bob lies", 1992, 5000000.0, 1050 , 2000.0);
    list[4] = new Drama ("Karate Kid","Jackie Chan", 1998, 2000000000.0, 60000000.0, 15.25);
    list[5] = new Drama ("The Amazing SpiderMan", "Bobby Smith", 2014, 150000000.0, 20000000.0, 14.50);

    printMovieInfo(list);  // <--- here is the call to print movie info

}

public static void printMovieInfo(Movie[] movie)
{
        for (int i =0; i < movie.length; i++){
            System.out.printf("%s", movie[i].toString());
}

错误数组输出

3 个答案: