I am pretty new to java, I am writing data to a file. My code looks like this:
File file= new File("model/file.csv");
FileOutputStream writer=null;
try {
writer = new FileOutputStream(file, true);
} catch (IOException e) {
e.printStackTrace();
}
PrintWriter pw=null;
pw = new PrintWriter(writer);
try {
for (int j=0;j< 24; j++)
pw.format("%.3f%n",MyData);
}
finally {
pw.close();
}
Output:
1
2
3
4
But when I run the program for the second time my output file looks like this:
Output:
1
2
3
4
1
2
3
4
Ok I figured that
writer = new FileOutputStream(file, true);
means that it appends, but I want the file to be refreshed and not contain data from the previous program execution. And also flush doesn't help.
My Suggestion is to use FileWriter like
Following syntax creates a FileWriter object given a file name with a boolean indicating whether or not to append the data written.
FileWriter(String fileName, boolean append)
set boolean to false to indicate you do not want to do the append.
for example:
try (PrintWriter out = new PrintWriter(new FileWriter("login.txt", false));) {
for (int i = 0; i < 10; i++) {
out.println(i);
}
} catch (IOException e) {
System.out.println(e);
}