How to write different values to multiple output files in Java?

Question

I have the following Java 8 code that creates 1 file fine (the content in the file is a singular line of text). What's the best way to change this code so I end up with three separate text files?

String os = System.getProperty("os.name");
String jv = System.getProperty("java.version");
String userfolder = System.getProperty("user.home");

try (Writer writer = new BufferedWriter(new OutputStreamWriter(
                new FileOutputStream(userfolder + "opsys.txt"), "utf-8")))
                {
                 writer.write((String) os);
                } catch (UnsupportedEncodingException e) 
                {
                e.printStackTrace();
                } catch (FileNotFoundException e) 
                {
                e.printStackTrace();
                } catch (IOException e) 
                {
                e.printStackTrace();
                }

Output I'm trying to achieve:

• 3 text files
  • named opsys.txt, version.txt and userhome.txt.
  • Each file contains the relevant System.getProperty answer.

Answer 1

you can put all the functionality for write files in a separate method, something like:

private void writeFile(String fileName, String content) {

    try (Writer writer = new BufferedWriter(new OutputStreamWriter(
            new FileOutputStream(fileName), "utf-8")))
    {
        writer.write((String) content);
    } catch (UnsupportedEncodingException e)
    {
        e.printStackTrace();
    } catch (FileNotFoundException e)
    {
        e.printStackTrace();
    } catch (IOException e)
    {
        e.printStackTrace();
    }
}

After that, your previous code becomes something like:

String os = System.getProperty("os.name");
String jv = System.getProperty("java.version");
String userfolder = System.getProperty("user.home");

//Here you call the writeFile method the number of time that you need:
writeFile(userfolder + "opsys.txt", os);
....

With this approach you can create any files that you need.