CODEWITHSUNDEEP
javafilewriter
Henrik
Henrik

Reputation: 19

Using try catch on FileWriter

I have a question regarding FileNotFoundExcpetion. The interface I have got defined the method name including "throws FileNotFoundExcpetion".

public static void writeAssignment(ArrayList<String> assignment, String filename) throws FileNotFoundException {

    try {
        FileWriter writer = new FileWriter(filename);
        for (String str : assignment) {
            writer.write(str + "\n");
        }
        writer.close();

    } catch (IOException e) {
        System.err.print("Something went wrong");
    }
}

Is this the right way to handle the exception? When I am writing to a file I am creating with the filewriter, how is it possible that the file wouldnt be found if I am creating the file in the method??

Upvotes: 1

Views: 9043

Answers (2)

Zenith
Zenith

Reputation: 1207

You can catch Exception instead of IOException

public static void writeAssignment(ArrayList<String> assignment, String filename) throws FileNotFoundException {

try {
    FileWriter writer = new FileWriter(filename);
    for (String str : assignment) {
        writer.write(str + "\n");
    }
    writer.close();

} catch (Exception e) {
    e.printStackTrace();
}
}

From this type coding, you can see/learn the hierarchy of exceptions. If you want to execute your program whether caught exception or not, you can use finally block. Where you will close your writer.

Upvotes: 0

JMax
JMax

Reputation: 1202

IOException is a super class of FileNotFoundException. Therefore your catch block for IOException also catches every FileNotFoundException.

You should implement the function as follows:

public static void writeAssignment(ArrayList<String> assignment, String filename) throws FileNotFoundException {

    try (FileWriter writer = new FileWriter(filename)) {
        for (String str : assignment) {
            writer.write(str + "\n");
        }
    } catch (FileNotFoundException e) {
        throw e; // catch and re-throw
    } catch (IOException e) {
        System.err.print("Something went wrong");
    }
}

Upvotes: 3

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