title: I am writing a String to a text file. but null is getting printed
body: <p>I have declared and initialed say a 
  String temp = null;</p>
  
  <p>through the program i am changing the value of temp by</p>
  
  <p>temp = temp + folders[i] + newline;</p>
  
  <p>and then write this String temp to a text file.</p>
  
  <p>Now the issue is, every time I write it to the file, the word "NULL" gets printed too.</p>
  
  <p>Please suggest me a work around.</p>