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MainPanel.java
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MainPanel.java
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.io.File;
import java.io.IOException;
import javax.swing.*;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout(10, 10));
JTextArea log = new JTextArea();
String deviceName = "con.txt";
JButton b1 = new JButton("c:/" + deviceName);
b1.addActionListener(e -> {
File file = new File(deviceName);
try {
if (file.createNewFile()) {
log.append("the named file does not exist and was successfully created.\n");
} else {
log.append("the named file already exists.\n");
}
} catch (IOException ex) {
// ex.printStackTrace();
Object[] msg = {ex.getMessage()};
showMessageDialog(msg);
}
});
Component p1 = makeTitledPanel("IOException: before 1.5", b1);
JButton b2 = new JButton("c:/" + deviceName + ":getCanonicalPath");
b2.addActionListener(e -> {
File file = new File(deviceName);
if (!isCanonicalPath(file)) {
Object[] msg = {file.getAbsolutePath() + " is not a canonical path."};
showMessageDialog(msg);
}
});
Component p2 = makeTitledPanel("getCanonicalPath: before 1.5", b2);
JButton b3 = new JButton("c:/" + deviceName + ":isFile");
b3.addActionListener(e -> {
File file = new File(deviceName);
if (!file.isFile()) {
Object[] msg = {file.getAbsolutePath() + " is not a file."};
showMessageDialog(msg);
}
});
Component p3 = makeTitledPanel("isFile: JDK 1.5+", b3);
JPanel p = new JPanel(new GridLayout(3, 1, 10, 10));
p.add(p1);
p.add(p2);
p.add(p3);
add(p, BorderLayout.NORTH);
add(new JScrollPane(log));
setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
setPreferredSize(new Dimension(320, 240));
}
private void showMessageDialog(Object... obj) {
JRootPane root = getRootPane();
JOptionPane.showMessageDialog(root, obj, "Error", JOptionPane.INFORMATION_MESSAGE);
}
// Before 1.5
@SuppressWarnings("PMD.OnlyOneReturn")
public static boolean isCanonicalPath(File file) {
if (file == null) {
return false;
}
try {
if (file.getCanonicalPath() == null || !file.isFile()) {
return false;
}
} catch (IOException ex) {
return false;
}
return true;
}
private static Component makeTitledPanel(String title, Component c) {
JPanel p = new JPanel(new BorderLayout());
p.setBorder(BorderFactory.createTitledBorder(title));
p.add(c);
return p;
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
ex.printStackTrace();
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}