Append content to text file, clear file content

	//Append content to the text file. If append=true, it will be appended by default. If append=false, the file will be emptied before appending the content.
    public static boolean updateContent(String fileName,String content,boolean append){
        boolean res = true;
        File file = new File(fileName);        
        try {
            if (!file.exists()) {
                file.createNewFile();
            }
            FileWriter writer = new FileWriter(file,append);
            if(append){
                content = System.getProperty("line.separator")+content;
                System.out.println(content);
            }
            writer.write(content);
            writer.flush();
            writer.close();
        } catch (IOException ex) {
            res = false;
            ex.printStackTrace();
        }
        return res;
    }

It is important to note that FileWriter has only one parameter constructor, which will clear the original file by default!
FileWriter fw = new FileWriter(file);