how to write to new text file in java

I am trying to write every line that i get to a test.txt file. However every result needs to be in its own line. Am i missing something or did i not corectly implemented "\n"? For better understanding my code reads 3th work in a line and if that word matches P***ei "*" meaning any letter from a-z (A-Z) or S**ei and returns first word in that line as an result. The code worked but now when i write to file it doesnt print each word in its own line.

package test; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.regex.Pattern; public class moja { public static void main(String[] args) { try { File file = new File("SloveneLexicon.txt"); FileReader fileReader = new FileReader(file); BufferedReader bufferedReader = new BufferedReader(fileReader); StringBuffer stringBuffer = new StringBuffer(); String vrstica; File test = new File("test.txt"); FileWriter fw = new FileWriter(test); while ((vrstica = bufferedReader.readLine()) != null) { String s = vrstica; String[] dobi_besedo_v_vrstici = s.split("\\s+"); String prva_beseda = dobi_besedo_v_vrstici[0]; String tretja_beseda = dobi_besedo_v_vrstici[2]; Pattern ena = Pattern.compile("S[a-zA-z]{2}ei"); if(ena.matcher(tretja_beseda).matches()){ fw.write(prva_beseda+'\n');} Pattern dva = Pattern.compile("P[a-zA-z]{3}ei"); if(dva.matcher(tretja_beseda).matches()){ fw.write(prva_beseda+'\n'); } } bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } }