package GUIstudy;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Testest1 {
public static void main(String[] args) {
new MyFrame();
}
}
class MyFrame extends Frame{
public void MyFrame() {
TextField textfield = new TextField();
add(textfield);
//监听文本框输入
MyActionListener2 myActionListener = new MyActionListener2();
textfield.addActionListener(myActionListener);
textfield.setEchoChar('*');
pack();
setVisible(true);
}
}
class MyActionListener2 implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
TextField field =(TextField)e.getSource(); //获得资源
System.out.println(field.getText());
field.setText("");
}
}
这怎么回事呀