ConsoleWindowTest.java Source code

Introduction

Here is the source code for ConsoleWindowTest.java

Source

/*
   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;
}