Java GUI编程（七）

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import java.awt.*;import java.awt.event.*;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.getSource();System.out.println(tf.getText());tf.setText("");}}

也可以这样写：

import java.awt.*;import java.awt.event.*;public class TFActionEvent {public static void main(String[] args){TextField tf=new TextField();TFActionListener fl=new TFActionListener();tf.addActionListener(fl);Frame myF=new Frame("TextField");myF.add(tf);myF.pack();myF.setVisible(true);}}class TFActionListener implements ActionListener{public void actionPerformed(ActionEvent e){TextField tf=(TextField) e.getSource();System.out.println(tf.getText());tf.setText("");}}

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