lesson8 输入框监控听 TestTextFieldActionEvent

package com.zym.lesson8;
 
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
public class TestTextFieldActionEvent {
    public static void main(String[] args) {
        //启动
        new MyFrame();
    }
}
 
 
class MyFrame extends Frame{
 
      public  MyFrame(){
 
          TextField textField=new TextField();
 
          add(textField);
 
          MyActonListener3 myActonListener3=new MyActonListener3();
 
          //监听这个文本框的输入名字
          //按下 enter回车键，就会触发这个输入框
           textField.addActionListener(myActonListener3);
 
           //对输入框的字进行 加星显示
           textField.setEchoChar('*');
 
           setTitle(" 课堂练习，输入框监听");
 
           setSize(200,200);
 
           setVisible(true);
 
           pack();
 
           addWindowListener(new WindowAdapter() {
                                      //窗体关闭时做的事
                                      @Override
                                      public void windowClosing(WindowEvent e) {
                                          // super.windowClosed(e);
                                          System.exit(0);
                                      }
                                  }
          );
 
      }
 
}
 
class MyActonListener3 implements ActionListener {
 
    @Override
    public void actionPerformed(ActionEvent e) {
        //获得一些资源
        e.getSource();
        TextField textField=(TextField)  e.getSource();
        System.out.println(textField.getText());
 
    }
}