A window that displays the bytes sent to System.out and System.err
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @version 1.23 2007-06-12
* @author Cay Horstmann
*/
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.OutputStream;
import java.io.PrintStream;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class ConsoleWindowTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
// this is the button test program from chapter 8
ButtonFrame frame = new ButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
// initialize the console window--System.out will show here
ConsoleWindow.init();
}
});
}
}
/**
* A frame with a button panel This code is identical to ButtonTest in chapter 8, except for the
* logging in the actionPerformed method of the ColorAction class
*/
class ButtonFrame extends JFrame
{
public ButtonFrame()
{
setTitle("ButtonTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// add panel to frame
ButtonPanel panel = new ButtonPanel();
add(panel);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 200;
}
/**
* A panel with three buttons
*/
class ButtonPanel extends JPanel
{
public ButtonPanel()
{
// create buttons
JButton yellowButton = new JButton("Yellow");
JButton blueButton = new JButton("Blue");
JButton redButton = new JButton("Red");
// add buttons to panel
add(yellowButton);
add(blueButton);
add(redButton);
// create button actions
ColorAction yellowAction = new ColorAction(Color.YELLOW);
ColorAction blueAction = new ColorAction(Color.BLUE);
ColorAction redAction = new ColorAction(Color.RED);
// associate actions with buttons
yellowButton.addActionListener(yellowAction);
blueButton.addActionListener(blueAction);
redButton.addActionListener(redAction);
}
/**
* An action listener that sets the panel's background color.
*/
private class ColorAction implements ActionListener
{
public ColorAction(Color c)
{
backgroundColor = c;
}
public void actionPerformed(ActionEvent event)
{
System.out.println(event); // shows in console window
setBackground(backgroundColor);
}
private Color backgroundColor;
}
}
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
A window that displays the bytes sent to System.out and System.err
@version 1.01 2004-05-10
@author Cay Horstmann
*/
class ConsoleWindow
{
public static void init()
{
JFrame frame = new JFrame();
frame.setTitle("ConsoleWindow");
final JTextArea output = new JTextArea();
output.setEditable(false);
frame.add(new JScrollPane(output));
frame.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
frame.setLocation(DEFAULT_LEFT, DEFAULT_TOP);
frame.setFocusableWindowState(false);
frame.setVisible(true);
// define a PrintStream that sends its bytes to the output text area
PrintStream consoleStream = new PrintStream(new
OutputStream()
{
public void write(int b) {} // never called
public void write(byte[] b, int off, int len)
{
output.append(new String(b, off, len));
}
});
// set both System.out and System.err to that stream
System.setOut(consoleStream);
System.setErr(consoleStream);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 200;
public static final int DEFAULT_LEFT = 200;
public static final int DEFAULT_TOP = 200;
}
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