Question

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Why do I get “Exception; must be caught or declared to be thrown” when I try to compile my Java code?

Thanks guy for solving my first issue, i am now getting a new error

import java.io.*;
import javax.swing.*;

public class FileBrowser {
    public static void main(String[] args) throws IOException {

        JFileChooser chooser = new JFileChooser();
        chooser.showOpenDialog(null);
        File file = chooser.getSelectedFile();
        String filename = file.getName();
        System.out.println("You have selected: " + filename);

        FileReader fr = new FileReader("filename"); 
        BufferedReader br = new BufferedReader(fr); 
        String s; 
        while((s = br.readLine()) != null) { 
            System.out.println(s); 
        } 
        fr.close(); 
    }
}

Error :

java.io.FileNotFoundException: filename (The system cannot find the file specified)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileInputStream.<init>(FileInputStream.java:97)
    at java.io.FileReader.<init>(FileReader.java:58)
    at FileBrowser.main(FileBrowser.java:13)

is the error where it is not properly getting the file name from the file browser ?

Answer 1

In addition to Adel Boutrons and Mark Byers answers. You also need to make some changes.

Firstly You are choosing file chooser so you will also need

   String path = file.getAbsolutePath();

This will give absolute path of your file including your file name.

   FileReader fr = new FileReader("filename"); 

Here you are not giving any file name, just string, remove “filename”.

    FileReader fr = new FileReader(path.replace("\\", File.separator)); 

If file not found then it will throw FileNotFoundException.