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POMulti-way redirection of System.out
 

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  1. POMulti-way redirection of System.out
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    <p>With approach shown in the following example, the output stream is being lost when an other class intercepts it. How to fix my program?</p> <p>Console.java:</p> <pre><code>package interception; import java.awt.BorderLayout; import java.awt.EventQueue; import javax.swing.*; import javax.swing.border.EmptyBorder; import java.io.*; public class Console extends JFrame { private JPanel contentPane; private JTextPane textPane; private class Interceptor extends PrintStream { public Interceptor(OutputStream out) { super(out,true); } @Override public void print(String s) { super.print(s); textPane.setText(textPane.getText()+s); } } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { Console frame = new Console(); frame.setVisible(true); System.out.print("System standard output stream test\n"); new Troll(); System.out.print("Haters gonna hate\n"); } catch (Exception e) { e.printStackTrace(); } } }); } public Console() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new BorderLayout(0, 0)); setContentPane(contentPane); textPane = new JTextPane(); textPane.setEditable(false); contentPane.add(textPane, BorderLayout.CENTER); redirectStream(); } protected void redirectStream() { PrintStream iout = new Interceptor(System.out); System.setOut(iout); } } </code></pre> <p>Troll.java:</p> <pre><code>package interception; import java.io.*; public class Troll { private class Interceptor extends PrintStream { public Interceptor(OutputStream out) { super(out,true); } @Override public void print(String s) { super.print(s); } } public Troll() { PrintStream iout = new Interceptor(System.out); System.setOut(iout); System.out.print("I've stolen your stream bwahaha!\n"); } } </code></pre> <p><img src="https://i.stack.imgur.com/W6N11.png" alt="enter image description here"></p> <p>In other words - after construction of "Troll" the Console is no longer able to intercept the output stream, so the text "haters gonna hate" isn't shown inside it. This is the problem.</p> <p><strong>UPDATE</strong></p> <p>Closing stream for <code>Troll</code> class is obviously unacceptable solution.</p>
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    1. COI don't think you can do anything about this, as there's no way provided to chain the streams
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