//read a file and print it on the screen

 import java.io.*;

 public class MyPrintStreamTest2{

 public static void main(String[] args) {

 String filename = args[0];    // firsttime to see!!!

 if(filename!=null){ list(filename,System.out); }

 }

 public static void list(String filename,PrintStream ps){

 try

 {

 BufferedReader br = new BufferedReader( new FileReader(filename) );

 String s = null;

 while ((s=br.readLine())!=null) {

 ps.println(s);

 }

 br.close();

 }

 catch(IOException e)

 {

 ps.println("reading file error!");

 }

 }

 }