Demonstrates Standard I/O Redirection

package com.bruceeckel;
 
//: c12:Redirecting.java
//Demonstrates standard I/O redirection.
//{Clean: test.out}
//From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
//www.BruceEckel.com. See copyright notice in CopyRight.txt.
 
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
 
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);
    }
}