public class JTextFieldTest extends JFrame {

    public JTextFieldTest() {
        // TODO Auto-generated constructor stub
        Container c = getContentPane();
        setLayout(new FlowLayout());
        final JTextField jt = new JTextField("aaa", 20);
        final JButton jb = new JButton("清除");
        jt.addActionListener(
 
new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                jt.setText("觸發事件");
            }
        });
        jb.addActionListener(new ActionListener() {
            
            @Override
            
 
public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                jt.setText("");
                jt.requestFocus();
            }
        });
        c.add(jt);
        c.add(jb);
        setSize(300, 300);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    
 
public static void main(String[] args) {
        // TODO Auto-generated method stub
        new JTextFieldTest();
    }

}

文本框組件