import java.awt.event.ActionEvent; import javax.swing.JFrame; import javax.swing.JTextField; public class AddingActionListenerJTextField { public static void main(String[] a) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JTextField jTextField1 = new JTextField(); jTextField1.setText("jTextField1"); jTextField1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println("action"); } }); frame.add(jTextField1); frame.setSize(300, 200); frame.setVisible(true); } }