CODEWITHSUNDEEP
javabufferedwriter
monkasd
monkasd

Reputation: 11

Java BufferedWriter doesn't write to file

I want to write some string to file (use Java 8). This code snippet compiles without any errors, but doesnt write to file....i'm noob ofcorz...any suggestion?

import java.io.BufferedWriter;
import java.io.FileWriter;

public class Main {
    private static final String FILENAME = "C:\\IntelliJfiles\\write-to- 
                                              file\\src\\pl\\sca\\file.txt";

    public static void main(String[] args) {

        try {
            String str = "kal";

            BufferedWriter writer = new BufferedWriter(new 
            FileWriter(FILENAME));
            writer.write(str);

            System.out.println("Done");

        }
        catch (Exception e) {
            System.out.println("There's no file");
            e.printStackTrace();
        }
    }
}

Upvotes: 0

Views: 5158

Answers (4)

Lyubna Elayyan
Lyubna Elayyan

Reputation: 11

try this one

try {
            String str = "kal";
            BufferedWriter writer = new BufferedWriter(new 
            FileWriter(FILENAME));
            writer.write(str);
            writer.close();
            System.out.println("Done");

        }

Upvotes: 0

sn42
sn42

Reputation: 2444

An alternative to BufferWriter is Files.write(Path, byte[], OpenOption...) if you aim at writing to a file only once.

String str = "test";
Path path = Paths.get("file.txt");

try {
    byte[] bytes = str.getBytes(StandardsCharsets.UTF_8);
    Files.write(path, bytes);
} catch (FileNotFoundException e) {
    // Handle file absence.
} catch (IOException e) {
    // Handle other exceptions related to io.
}

Note: As mentioned here catching Exception doesn't indicate file absence in all cases. Catch FileNotFoundException if you want to handle file absence or IOException for all exceptional conditions related to io.

Upvotes: 0

Peter Samokhin
Peter Samokhin

Reputation: 874

You need to close the writer, you can use try-with-resources:

String str = "kal";

// we can use try-with-resources from java 7
try (BufferedWriter writer = new BufferedWriter(new FileWriter(FILENAME))) {
    writer.write(str);
}

System.out.println("Done");

Or simply add writer.close():

writer.write(str);
writer.close();

Upvotes: -1

Probie
Probie

Reputation: 1361

It may not write to the file until you close it - writing to the disk is time consuming so it waits until enough characters are written before doing actually putting them in the file. That's what the Buffered in BufferedWriter means. If you close it, it will "flush" the buffer onto the disk.

You can close it yourself using writer.close()

Or you can make use of try-with-resources, which will automatically close the writer:

try (FileWriter fw = new FileWriter("C:\\IntelliJfiles\\write-to-file\\src\\pl\\sca\\file.txt");
     BufferedWriter bw = new BufferedWriter(fw)){
    bw.write("kal");
} catch (Exception e) {
    e.printStackTrace();
}

Upvotes: 2

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