java - 在不引发FileNotFoundException的情况下无法声明全局静态Scanner对象？

Question

基本上，我正在为自己制作的一个简单的CLI游戏运行一些测试，并且最初，我的所有变量/对象都是在main()方法的开头声明的。现在，我必须创建一个使用某些相同对象/变量的新方法，因此我决定将所有变量移出main()，并将其设置为静态/全局。这样做时，我遇到了一个问题:尽管main()抛出FileNotFoundException，我还是收到以下错误消息:

Tests.java:14: error: unreported exception FileNotFoundException; must be caught or declared to be thrown
        static Scanner boardReader = new Scanner(board);

这是我的代码，直到有问题的一行:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;
import java.util.Scanner;

class Tests {
    
    // GAME OBJECTS AND VARIABLES

    // The following is used for reading, displaying, and writing to the game board.
    static File board = new File("Board.txt");
    static Scanner boardReader = new Scanner(board);
    static FileWriter boardWriter = null;
    static StringBuilder boardBuilder = new StringBuilder((int)board.length());

    static String boardDisplay = null;  // This String allows boardContents to print in a more readable way.
    static String boardContents = null; // This is Board.txt represented as a String.

    // There are more variables here than shown, but these are the ones relevant to my problem.
    
    // GAMEPLAY

    public static void main(String[] args) throws FileNotFoundException, IOException {
        
        boolean gameIsOngoing = true;
        while(gameIsOngoing) {
        
            // boardContents String from boardBuilder StringBuilder
            while (boardReader.hasNextLine()) {
                boardContents = (boardBuilder.append(boardReader.nextLine() + System.lineSeparator()).toString());
            }
            // More irrelevant code here.
        }
    }
}

为了解决此问题，我尝试将使用boardReader的代码放入适当的try-catch中，如下所示:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;
import java.util.Scanner;

class Tests {
    
    // GAME OBJECTS AND VARIABLES

    // The following is used for reading, displaying, and writing to the game board.
    static File board = new File("Board.txt");
    static FileWriter boardWriter = null;
    static StringBuilder boardBuilder = new StringBuilder((int)board.length());

    static String boardDisplay = null;  // This String allows boardContents to print in a more readable way.
    static String boardContents = null; // This is Board.txt represented as a String.

    // There are more variables here than shown, but these are the ones relevant to my problem.
    
    // GAMEPLAY

    public static void main(String[] args) throws IOException {
        
        boolean gameIsOngoing = true;
        while(gameIsOngoing) {
        
            // boardContents String from boardBuilder StringBuilder
            try (Scanner boardReader = new Scanner(board)) {
                while (boardReader.hasNextLine()) {
                    boardContents = (boardBuilder.append(boardReader.nextLine() + System.lineSeparator()).toString());
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            // More irrelevant code here.
        }
    }
}

可以，但是由于不再将Scanner对象与所有其他对象一起列出，因此使我的代码更难理解。我想我的问题是，为什么第一个代码不起作用？类似的东西有可能工作吗？
我还想快速提及在研究此问题时，我看到一些事情说让Scanner对象成为全局/静态对象通常是不好的做法。我认为，由于此特定的扫描仪未收集用户输入(并且我没有计划在完成后维护此相对简单的项目)，因此这不会有太大问题。
编辑:我不知道为什么，但是编辑器不允许我在本文的开头放置“Hello”，所以这里是...大家好:)

Answer 1

存在错误，因为未捕获到异常。 Scanner实例是在Tests类的上下文中创建的，main方法有所不同，因此在其中捕获它不会解决问题。
如果您要解决此问题，可以尝试执行以下操作:

static {
    try {
        boardReader = new Scanner(board);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
}