java - 无法找出 FileReader 的问题

Question

已关闭。这个问题是 not reproducible or was caused by typos 。目前不接受答案。

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这个问题是由拼写错误或无法再重现的问题引起的。虽然类似的问题可能是 on-topic在这里，这个问题的解决方式不太可能帮助 future 的读者。

已关闭 9 年前。

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import java.io.File;
import java.io.FileReader;
import java.util.Scanner;

public class lab4 {

    public static void main(String[] args){

        /*
         * Input is the name of the file and location typed by the user
         * file is used as a new scanner of the file to later go into the FileReader
         */

        String input;
        Scanner file;

        System.out.println("Please type the name of the file you wish to read into the program");

        // scanner to acquire input
        Scanner scanner = new Scanner(System.in);

        input = scanner.nextLine();

        System.out.println("the file input was " + input);

        // tries to attach the specified file "input" to a new scanner "file" to later read into FileReader
        try{
            file = new Scanner(new File(input));
        }
        catch(Exception e){
            System.out.println("The requested file could not be found");
        }

         FileReader(File file){
            while(file.hasNext()){
                String s = file.next();

            }
       }
    }

}

在几个长期的编程问题之后，我在每次添加新内容后都进行了编译我在 FileReader 上遇到错误，我已经查找了示例，我所做的应该是正确的，

java: ')' expected
java: illegal start of expression
java: ';' expected
java: class, interface, or enum expected

错误指向 FileReader 的位置，所以显然我使用错误，我不需要；我看到的例子是使用 public void FileReader(File "fileName") 之类的方法我被告知将整个代码放入 public static void main(String[] args)

我看了 youtube 并查找了 API，但没有发现任何问题。

Answer 1

在执行此类操作之前，您可能应该先了解一下 Java 基础知识。

无论如何，这是一个示例:

    try
    {
        File file = new File("input-file.txt");
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);
        String line = null;
        while ( (line = bufferedReader.readLine()) != null )
        {
            // do stuff with the line that was read
        }
    }
    catch (FileNotFoundException e)
    {
        e.printStackTrace();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }