Having Trouble With Creating a File in Java

Question

import javax.swing.*;
import java.io.*;
import java.util.*;
class Buns {
    public static void main(String[] args) {
        File f= new File("Buns.dat");
            f.createNewFile();
   }
}

This program raises an IOException on the createNewFile call can anyone tell me why this could be happening?

What's the message of the exception? (Note that your code as written won't even compile, because you're neither catching `IOException` nor declaring that `main` can throw it.) — Jon Skeet, Mar 02 '13 at 08:20
Ahh, I think the OP means that the compiler is objecting about an unhandled exception, not that an exception is actually being thrown. — Aurand, Mar 02 '13 at 08:22

score 3 · Accepted Answer · edited May 23 '17 at 11:43

Wrap it around try/catch block as File#createNewFile() might throw IOException in case of IOError.IOException is a checked exception and in java compiler will force you to handle/declare checked exceptions in the code yourself.

try {
File f= new File("Buns.dat");
f.createNewFile();
}
catch(IOException ex){
ex.printStacktrace();
}

From java 1.7 using try-with-resource Statement:

try(File f= new File("Buns.dat")) {
    f.createNewFile();
    }
    catch(IOException ex){
    ex.printStacktrace();
    }

If you choose to use try-with-resource statement, the only difference is that you don't need to closeyour resouces explicitly using finally block. To use try-with-resource though the object which you use inside the try-with-resource statement must implementjava.lang.AutoCloseable`.

You can also propagate the exception by using throws clause in your method signature.

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

Related:

Thanks it worked and was helpful! =D – Kevin K Mar 02 '13 at 08:41 — Kevin K, Mar 02 '13 at 08:41

score 0 · Answer 2 · answered Mar 02 '13 at 08:21

0

public static void main (String [] args) throws IOException
{
    File f= new File ("Buns.dat");
    f.createNewFile ();
}

answered Mar 02 '13 at 08:21

Mikhail Vladimirov

13,572
1
38
40

score 0 · Answer 3 · answered Mar 02 '13 at 08:22

0

Check that you have permission to create a file in the directory you are running in.

answered Mar 02 '13 at 08:22

SteveP

18,840
9
47
60

Having Trouble With Creating a File in Java

3 Answers3