import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JTextField; public class AddingActionCommandActionListenerSample { public static void main(String args[]) { JFrame frame = new JFrame("Default Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JTextField textField = new JTextField(); frame.add(textField, BorderLayout.NORTH); ActionListener actionListener = new ActionListener() { public void actionPerformed(ActionEvent actionEvent) { System.out.println("Command: " + actionEvent.getActionCommand()); } }; textField.setActionCommand("Yo"); textField.addActionListener(actionListener); frame.setSize(250, 150); frame.setVisible(true); } }