Java IO.pdf - Nguyen Dang Binh

Java I/O
mixed AWT components with the Swing JFileChooser rapidly crashed the VM. Replacing
all components with their Swing equivalents solved the problem.
Let's begin the exegesis of the code where I began writing it, with the user interface. The main
driver class is FileViewer, shown in Example 13.12. This class extends JFrame. Its
constructor doesn't do a lot. Most of the work is relegated to the init() method, which sets
up the user interface composed of the three parts previously described, then centers the whole
frame on the primary display.
Example 13.12. FileViewer
import javax.swing.*;
import java.io.*;
import com.macfaq.io.*;
import com.macfaq.swing.*;
import java.awt.*;
import java.awt.event.*;
public class FileViewer extends JFrame
implements WindowListener, ActionListener {
JFileChooser fc = new JFileChooser();
JStreamedTextArea theView = new JStreamedTextArea();
ModePanel mp = new ModePanel();
public FileViewer() {
super("FileViewer");
}
public void init() {
}
this.addWindowListener(this);
fc.setApproveButtonText("View File");
fc.setApproveButtonMnemonic('V');
fc.addActionListener(this);
this.getContentPane().add("Center", fc);
JScrollPane sp = new JScrollPane(theView);
this.getContentPane().add("South", sp);
this.getContentPane().add("West", mp);
this.pack();
// Center on display.
Dimension display = getToolkit().getScreenSize();
Dimension bounds = this.getSize();
int x = (display.width - bounds.width)/2;
int y = (display.height - bounds.height)/2;
if (x < 0) x = 10;
if (y < 0) y = 15;
this.setLocation(x, y);
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals(JFileChooser.APPROVE_SELECTION)) {
File f = fc.getSelectedFile();
if (f != null) {
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