package com.wang.first;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * @author valive
 * @create 2021-04-06 19:22
 **/
public class Texttext01 {
    public static void main(String[] args) {
        //启动
        new myFrame();

    }

}

class myFrame extends Frame{
    public myFrame(){
        TextField textField =new TextField();
        add(textField);

        //监听输入的文字
       MyActionListener myActionListener=new MyActionListener();
       //按下enter就会触发输入框事件
        textField.addActionListener(myActionListener);

        //设置置换编码
        textField.setEchoChar('*');
        setVisible(true);
        pack();
    }
}

class MyActionListener implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e){
        TextField field=(TextField) e.getSource();
        System.out.println(field.getText());//获得输入框文本
        field.setText("");
    }
}

代码可实现