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Demonstrates standard IO redirection

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 MainClass {   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();      System.setOut(console);   } }