2.5 输入框TextField
package com.GGp.lesson02;
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 TestText01 {
public static void main(String[] args) {
//启动
new MyFrame();
}
}
class MyFrame extends Frame{//因为继承Frame,所以无需new Frame对象,frame.
public MyFrame(){//无参构造
TextField textField = new TextField();
add(textField);
//监听这个文本框输入的文字
MyActionListener2 myActionListener2 = new MyActionListener2();
//按下enter就会触发这个输入框的事件
textField.addActionListener(myActionListener2);//添加监听器
//设置替换编码(类似密码)
textField.setEchoChar('*');
setVisible(true);
pack();//自动填充适配
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
class MyActionListener2 implements ActionListener{//监听器接口,需要监听干什么事
@Override
public void actionPerformed(ActionEvent e) {
TextField field = (TextField) e.getSource();//获得一些资源,返回对象
System.out.println(field.getText());//获取输入框内容
field.setText("");//设置回车清空
}
}