How to write an ArrayList of Strings into a text file?

Question

I want to write an ArrayList<String> into a text file.

The ArrayList is created with the code:

ArrayList arr = new ArrayList();  StringTokenizer st = new StringTokenizer(     line, ":Mode set - Out of Service In Service");  while(st.hasMoreTokens()){     arr.add(st.nextToken());     } 

Answer 1

import java.io.FileWriter; ... FileWriter writer = new FileWriter("output.txt");  for(String str: arr) {   writer.write(str + System.lineSeparator()); } writer.close();