为什么我的BufferedReader不能读取文本文件？

Question

为什么我的BufferedReader不能工作？我正在尝试使用BufferedReader读取文本文件，但每次运行程序时都会说我的行中有错误：

BufferedReader br = new BufferedReader(new FileReader("playerinfo.txt"));

我还在学习，我无法弄清楚我的BufferedReader有什么问题。我试图让它读取玩家统计数据的文本文件，然后输出文件。我创建了一个文本文件来读取，但每次我尝试运行我的程序时仍然会出现错误。我试图查找与我相似的问题，但似乎有几种方法可以做一个BufferedReader，我认为我的看起来应该正常工作。我在代码中找不到其他任何看似错误的部分，但我还是比较新的。非常感谢任何有关此问题的帮助。

这是我试图实现它的方式：

import java.util.*;
import java.io.*;

class Player { //Base class
    String name;
    float weight;
    int age;

    Player() {
    }

    ;

    Player(String name, float weight, int age) {
        this.name = name;
        this.weight = weight;
        this.age = age;
    }
}

class Defensive extends Player {
    int tackles, interceptions;
    float sacks;

    Defensive() {
        super();
    }

    Defensive(String name, float weight, int age, int tackles, int interceptions, float sacks) {
        super(name, weight, age);
        this.tackles = tackles;
        this.interceptions = interceptions;
        this.sacks = sacks;
    }

    public String toString() {
        return "name : " + name + ", weight : " + weight + ", age : " + age + ", tackles : " + tackles + ", sacks : " + sacks + ", interceptions : " + interceptions + "\n";
    }
}

class Football { //main class
    public Defensive readDefensive(BufferedReader br) throws IOException {
        String name = br.readLine();
        float weight = Float.parseFloat(br.readLine());
        int age = Integer.parseInt(br.readLine());
        int tackles = Integer.parseInt(br.readLine());
        float sacks = Float.parseFloat(br.readLine());
        int interceptions = Integer.parseInt(br.readLine());
        return (new Defensive(name, weight, age, tackles, interceptions, sacks));
    }

    public static void main(String[] args) throws IOException {
        Football football = new Football();
        BufferedReader br = new BufferedReader(new FileReader("playerinfo.txt"));
        String line = br.readLine();
        Defensive defensive = new Defensive();
        ArrayList al = new ArrayList();
        while (line != null) {
            if (line.equals("defensive")) {
                defensive = football.readDefensive(br);
                al.add(defensive);
            }
            line = br.readLine();
        }
        System.out.println(al);
    }
}

Answer 1

您的包含主要方法的类应该声明为public class。

此外，您应该考虑使用泛型列表，因为您的实现现在会生成警告。使用List<Defensive> defensives = new ArrayList<>();