[[Eclipse]] import java.awt.HeadlessException; public class TestTextField extends JFrame implements ActionListener { import java.awt.Headl import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.BoxLayout; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField;essException; public class TestTextField extends JFrame implements ActionListener { JTextField tf1; JTextField tf2; public TestTextField() throws HeadlessException { super(); // TODO Auto-generated constructor stub setSize(300,200); setTitle("Swing サンプル"); setLocation(210,415); JPanel p = new JPanel(); p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS)); tf1 = new JTextField(""); tf2 = new JTextField(""); tf1.addActionListener(this); tf2.addActionListener(this); p.add(tf1); p.add(tf2); getContentPane().add(p); setVisible(true); } public void actionPerformed(ActionEvent arg0) { // TODO Auto-generated method stub if(arg0.getSource() == tf1){ tf1.setText("textfield1"); }else if(arg0.getSource() == tf2){ tf2.setText("textfield2"); } } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub new TestTextField(); }