Java tutorial
import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.EOFException; import java.io.FileWriter; import java.io.IOException; import java.io.PrintWriter; import java.io.StringReader; public class MainClass { public static void main(String[] args) throws IOException { try { BufferedReader in4 = new BufferedReader(new StringReader("asdf")); PrintWriter out1 = new PrintWriter(new BufferedWriter(new FileWriter("IODemo.out"))); int lineCount = 1; String s = null; while ((s = in4.readLine()) != null) out1.println(lineCount++ + ": " + s); out1.close(); } catch (EOFException e) { System.err.println("End of stream"); } } }