redirecting.java

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import java.io.*;
public class Redirecting {
  // Throw exceptions to console:
  public static void main(String[] args)
  throws IOException {
    PrintStream console = System.out;
    BufferedInputStream in = new BufferedInputStream(
      new FileInputStream("Redirecting.java"));

    PrintStream out = new PrintStream(
      new BufferedOutputStream(
        new FileOutputStream("test.out")));

    System.setIn(in);
    System.setOut(out);
    System.setErr(out);

    BufferedReader br = new BufferedReader(
      new InputStreamReader(System.in));
    String s;
    while((s = br.readLine()) != null)
      System.out.println(s);
    out.close(); // Remember this!
    System.setOut(console);
  }
}