FileNotFoundException 但文件出现在正确的路径

Question

I'm new to programming, every time I try to read a file. I get FileNOtFoundException.

Where could I be going wrong?

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

public class ReadFile 
{
    public ReadFile()
    {
        readFile();
    }
    public void readFile()
    {
        String filename = "trees.txt";
        System.out.println(new File(".").getAbsolutePath()); //file is at this path.
        String name = "";
        try
        {
            FileReader inputFile = new FileReader(filename);
            Scanner parser = new Scanner(inputFile);
            while (parser.hasNextLine())
            {
                name = parser.nextLine();
                System.out.println(name);
            }
            inputFile.close();
        }
        catch (FileNotFoundException exception)
        {
            System.out.println(filename + " not found");
        }
    }
}

Is there any other way I could read the file?

Answer 1

this code

FileReader inputFile = new FileReader(filename);

You must define full path to file with name filename if not it will open file not at current working directory you should try

FileReader inputFile = new FileReader(new File(new File("."), filename));
// defind new File(".") it mean you will you open file in current working directory  

you can read more at: Java, reading a file from current directory?

Answer 2

Try printing the path of the file you are actually trying to open so you can be sure that the file exists in the right location

String filename = "trees.txt";
File file = new File(filename);
System.out.println(file.getAbsolutePath());

Also, you are closing the FileReader inside the try , and not closing the Scanner , if some error ever occurs those resources will never be closed, you need to put those close statements in a finally block, or better use try with resources