RE:Como capturar de un JtextField
La siguiente clase captura el evento de presionar Enter sobre un JTextField
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import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class TextFieldCapture extends JFrame{
public TextFieldCapture(){
super("Input Capture Event");
Container panel = this.getContentPane();
panel.setLayout(new FlowLayout());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel label = new JLabel("Presione Enter: ");
JTextField text = new JTextField();
text.setPreferredSize(new Dimension(100,20));
text.addKeyListener(
new KeyListener(){
public void keyTyped(KeyEvent e) {
}
public void keyPressed(KeyEvent e) {
if( e.getKeyCode() == KeyEvent.VK_ENTER){
JOptionPane.showMessageDialog(null, "Se ha presionado Enter");
}
}
public void keyReleased(KeyEvent e) {
}
}
);
panel.add(label);
panel.add(text);
this.pack();
this.setSize(this.getWidth() + 40, this.getHeight() + 20);
this.center();
this.setVisible(true);
}
public static void main(String[] args){
EventQueue.invokeLater(new Runnable(){
public void run(){
new TextFieldCapture();
}
});
}
public void center(){
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth = (int)screen.getWidth();
int screenHeight = (int)screen.getHeight();
int dialogWidth = this.getWidth();
int dialogHeight = this.getHeight();
this.setLocation((screenWidth-dialogWidth)/2, (screenHeight-dialogHeight)/2);
}
}
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Espero te sirva. Suerte.
