Mega Code Archive
Validate a value on the lostFocus event
<![CDATA[
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import javax.swing.JComponent;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class Main {
JTextField tf1;
public void init() {
tf1 = new JTextField(5);
tf1.addFocusListener(new FocusListener() {
public void focusGained(FocusEvent e) {
};
public void focusLost(FocusEvent e) {
if (!e.isTemporary()) {
String content = tf1.getText();
if (!content.equals("a") ) {
System.out.println("illegal value! " + content);
SwingUtilities.invokeLater(new FocusGrabber(tf1));
}
}
}
});
}
}
class FocusGrabber implements Runnable {
private JComponent component;
public FocusGrabber(JComponent component) {
this.component = component;
}
public void run() {
component.grabFocus();
}
}
]]>