Read System.in from JTextField

Question

hi all, I have found this code that redirect System.in and System.out on JTextArea:
package xyzGui;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
public class resGui extends javax.swing.JFrame {
    PipedInputStream piOut;
    PipedInputStream piErr;
    PipedOutputStream poOut;
    PipedOutputStream poErr;
    /** Creates new form resGui */
    public resGui() {
        initComponents();
        try {
            // Set up System.out
            piOut = new PipedInputStream();
            poOut = new PipedOutputStream(piOut);
            System.setOut(new PrintStream(poOut, true));
            // Set up System.err
            piErr = new PipedInputStream();
            poErr = new PipedOutputStream(piErr);
            System.setErr(new PrintStream(poErr, true));
            // Create reader threads
            new ReaderThread(piOut).start();
            new ReaderThread(piErr).start();
        catch(Exception e) {
            System.exit(0);
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    private void initComponents() {
        jScrollPane1 = new javax.swing.JScrollPane();
        consoleArea = new javax.swing.JTextArea();
        commandLine = new javax.swing.JTextField();
        getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
        setResizable(false);
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        jScrollPane1.setViewportView(consoleArea);
        getContentPane().add(jScrollPane1, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 60, 610, 200));
        commandLine.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyPressed(java.awt.event.KeyEvent evt) {
                commandLineKeyPressed(evt);
        getContentPane().add(commandLine, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 40, 610, -1));
        pack();
    private void commandLineKeyPressed(java.awt.event.KeyEvent evt) {
        if(evt.getKeyCode()==10) {
            String val = commandLine.getText();
            if(val.equals("exit")) {
                System.exit(0);
            commandLine.setText("");
            consoleArea.append(val+"\n");
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    // Variables declaration - do not modify
    private javax.swing.JTextField commandLine;
    private javax.swing.JTextArea consoleArea;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration
    class ReaderThread extends Thread
        PipedInputStream pi;
        ReaderThread(PipedInputStream pi)
            this.pi = pi;
        public void run()
            final byte[] buf = new byte[1024];
            try
                while (true)
                    final int len = pi.read(buf);
                    if (len == -1)
                        break;
                    SwingUtilities.invokeLater(new Runnable()
                        public void run()
                            consoleArea.append(new String(buf, 0, len));                           
                            // Make sure the last line is always visible
                            consoleArea.setCaretPosition(consoleArea.getDocument().getLength());
            catch (IOException e)
}...I would like, if possible read System.in from JTextField and not from JTextArea:
Input from text box and output to text area.
Thanks

Answer 1

It doesen't work. I would like to create a GUI for a command line application. I would like to send command to my "command line" application using textfield in GUI and not using console. In my sample System.out is redirected on JTextArea I try to redirect JTextFiled value on System.in...