Trying to print the lines after writing them to an ouput file (java) -

i have problem. i'm asked use method print output file. start off began filling output file lines..then when tried read them , print them on screen there slight problem. used 'debug' option , problem turned out within ' line = input.nextline()' line of code don't know why..i mean that's how read output file...help appreciated.

here's work far:

import java.util.*; import java.io.*;  public class problem_3 {      public static void main(string[] args) {          printwriter outfile = null;         file f1 = new file("try.txt");           try {              outfile = new printwriter("try.txt");             outfile.println("first line!");             outfile.println("second line!");             outfile.println("third line!");              cat(f1);         } catch (exception e) {             outfile.print("(1) exception: " + e.getmessage()); // no such element exception         }          outfile.close();     }     /*      * outfile = new printwriter(f1); outfile.println("line 1");      * outfile.println("line 2"); outfile.println("line 3"); outfile.print("");      * cat(f1); } catch (exception e) { system.out.println("(1)exception: " +      * e.getmessage()); } outfile.close(); }      */      public static void cat(file file) throws filenotfoundexception {          scanner input = null;         string line = "";          input = new scanner(new filereader(file));         //line = input.next();         //  line = input.nextline();// line calls exception in main method          while ((line != null)) {             system.out.println("in while loop");             system.out.println("line  323" + line);             return;         }         input.close();     } } 

modify code be:

try {      outfile = new printwriter("try.txt");     outfile.println("first line!");     outfile.println("second line!");     outfile.println("third line!");      outfile.close();    }   catch (exception e) {     outfile.print("(1) exception: " + e.getmessage()); // no such element exception  }   cat(f1); 

you can't read written before close file.