JTextField Sample 2
/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski
ISBN: 1-893115-78-X
Publisher: APress
*/
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
public class JTextFieldSample {
public static void main(String args[]) {
String title = (args.length == 0 ? "TextField Listener Example"
: args[0]);
JFrame frame = new JFrame(title);
Container content = frame.getContentPane();
JPanel namePanel = new JPanel(new BorderLayout());
JLabel nameLabel = new JLabel("Name: ");
nameLabel.setDisplayedMnemonic(KeyEvent.VK_N);
JTextField nameTextField = new JTextField();
nameLabel.setLabelFor(nameTextField);
namePanel.add(nameLabel, BorderLayout.WEST);
namePanel.add(nameTextField, BorderLayout.CENTER);
content.add(namePanel, BorderLayout.NORTH);
JPanel cityPanel = new JPanel(new BorderLayout());
JLabel cityLabel = new JLabel("City: ");
cityLabel.setDisplayedMnemonic(KeyEvent.VK_C);
JTextField cityTextField = new JTextField();
cityLabel.setLabelFor(cityTextField);
cityPanel.add(cityLabel, BorderLayout.WEST);
cityPanel.add(cityTextField, BorderLayout.CENTER);
content.add(cityPanel, BorderLayout.SOUTH);
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
System.out
.println("Command: " + actionEvent.getActionCommand());
}
};
nameTextField.setActionCommand("Yo");
nameTextField.addActionListener(actionListener);
cityTextField.addActionListener(actionListener);
KeyListener keyListener = new KeyListener() {
public void keyPressed(KeyEvent keyEvent) {
printIt("Pressed", keyEvent);
}
public void keyReleased(KeyEvent keyEvent) {
printIt("Released", keyEvent);
}
public void keyTyped(KeyEvent keyEvent) {
printIt("Typed", keyEvent);
}
private void printIt(String title, KeyEvent keyEvent) {
int keyCode = keyEvent.getKeyCode();
String keyText = KeyEvent.getKeyText(keyCode);
System.out.println(title + " : " + keyText + " / "
+ keyEvent.getKeyChar());
}
};
nameTextField.addKeyListener(keyListener);
cityTextField.addKeyListener(keyListener);
InputVerifier verifier = new InputVerifier() {
public boolean verify(JComponent input) {
final JTextComponent source = (JTextComponent) input;
String text = source.getText();
if ((text.length() != 0) && !(text.equals("Exit"))) {
Runnable runnable = new Runnable() {
public void run() {
JOptionPane.showMessageDialog(source,
"Can't leave.", "Error Dialog",
JOptionPane.ERROR_MESSAGE);
}
};
SwingUtilities.invokeLater(runnable);
return false;
} else {
return true;
}
}
};
nameTextField.setInputVerifier(verifier);
cityTextField.setInputVerifier(verifier);
DocumentListener documentListener = new DocumentListener() {
public void changedUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
public void insertUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
public void removeUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
private void printIt(DocumentEvent documentEvent) {
DocumentEvent.EventType type = documentEvent.getType();
String typeString = null;
if (type.equals(DocumentEvent.EventType.CHANGE)) {
typeString = "Change";
} else if (type.equals(DocumentEvent.EventType.INSERT)) {
typeString = "Insert";
} else if (type.equals(DocumentEvent.EventType.REMOVE)) {
typeString = "Remove";
}
System.out.print("Type : " + typeString + " / ");
Document source = documentEvent.getDocument();
int length = source.getLength();
try {
System.out
.println("Contents: " + source.getText(0, length));
} catch (BadLocationException badLocationException) {
System.out.println("Contents: Unknown");
}
}
};
nameTextField.getDocument().addDocumentListener(documentListener);
cityTextField.getDocument().addDocumentListener(documentListener);
frame.setSize(250, 150);
frame.setVisible(true);
}
}
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