Java tutorial
import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileReader; import java.io.FileWriter; import java.io.InputStreamReader; import java.io.PrintWriter; import java.io.StringReader; public class Main { public static void main(String[] args) throws Exception { BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in)); System.out.println(stdin.readLine()); BufferedReader in = new BufferedReader(new FileReader("Main.java")); String s, s2 = new String(); while ((s = in.readLine()) != null) s2 += s + "\n"; in.close(); StringReader in1 = new StringReader(s2); int c; while ((c = in1.read()) != -1) System.out.print((char) c); BufferedReader in2 = new BufferedReader(new StringReader(s2)); PrintWriter out1 = new PrintWriter(new BufferedWriter(new FileWriter("IODemo.out"))); int lineCount = 1; while ((s = in2.readLine()) != null) out1.println(lineCount++ + ": " + s); out1.close(); } }