GUI编程（3）输入框的监听

package com.Jiu;

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 Notto4 {

    public static void main(String[] args) {

        MyFrame1 myFrame1=new MyFrame1(200,200,400,400);

    }
}

class MyFrame1 extends Frame{
    public MyFrame1(int x,int y,int w,int h){
        setVisible(true);
        setSize(w,h);
        setLocation(x,y);
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(0);
            }
        });

        TextField textField = new TextField();
        add(textField);
        textField.addActionListener(new MyActionListener1());
        textField.setEchoChar('*');//设置替换编码
    }
}

class MyActionListener1 implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e) {
       TextField field =(TextField) e.getSource();//获得输入框资源赋值给field，通过field来实现输入框的操作
        System.out.println(field.getText());//输出输入框中的文本
        field.setText("");
    }
}