import java.awt.*;
import java.awt.event.*;
//import java.util.*;
//import java.lang.*;
//import static net.mindview.util.Print.*;

public class TFActionEvent
{
    public static void main(String[] args)
    {
        new TFFrame();
    }
}

class TFFrame extends Frame
{
    TFFrame()
    {
        TextField tf = new TextField();
        add(tf);
        tf.addActionListener(new TFActionListener());
        pack();
        setVisible(true);
    }
}

class TFActionListener implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
        TextField tf = (TextField)e.getSourse();
        System.out.println(tf.getText());
        tf.setText("");
    }
}

编译时会出现以下结果：
符号：  方法 getSourse（）
位置：  类 java.awt.enevt.ActionEvent
                Textfield tf = （TextField)e.getSourse();