Writing data in file using FIlewriter

Question

I am making a simple program that put data into a file using FileWriter .

But I am facing a problem. My code is creating the fie but not putting data into the file.

import java.io.*;

class Temp
{
    public static void main(String args[])throws Exception
    {
        FileWriter fw=new FileWriter("ma.txt");
        BufferedWriter bw=new BufferedWriter(fw);
        String str="dslkm dsk";
        bw.write(str);
    }
}

Why is this happening?

Answer 1

You need to flush and close the writer.

bw.flush();
bw.close();

Even just closing the writer should be enough, since it automatically flushes before closing.

Answer 2

Your code should be:

    public static void main(String args[])throws Exception
    {
        FileWriter fw=new FileWriter("ma.txt");
        BufferedWriter bw=new BufferedWriter(fw);
        String str="dslkm dsk";
        bw.write(str);
        bw.flush();
        bw.close();
    }

Answer 3

A file writer always need to be closed or flushed. Otherwise there is no guarantee to the write the bytes / characters in it to be written in your file.And it's better to use fileWriter with try-catch-finally block -

try {
       FileWriter fw=new FileWriter("ma.txt");
       BufferedWriter bw=new BufferedWriter(fw);
       String str="dslkm dsk";
       bw.write(str);

    } catch (IOException ex){
       System.err.println("Couldn't log this: "+s);
    }finally{
       bw.close();
    }