java中接口和事件监听器的深入理解

public class UI {
 /**
 * 
 */
 public void showIU(){
 //建立新界面
 JFrame frame=new JFrame();
 frame.setSize(600, 900);
 //用户点击关闭窗口时关闭界面
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 //流式布局
 FlowLayout layout=new FlowLayout();
 frame.setLayout(layout);
 //插入账号文本框
 JTextField register=new JTextField(30);
 frame.add(register);
 //标签1
 JLabel label1=new JLabel("注册账号");
 frame.add(label1);
 //密码
 JPasswordField word=new JPasswordField(30);
 frame.add(word);
 //标签2
 JLabel label2= new JLabel("找回密码");
 frame.add(label2);
 
 JCheckBox checkbox=new JCheckBox("记住密码 ");
 frame.add(checkbox);
 //设置复选框大小
 Dimension check =new Dimension(200,35);
 checkbox.setPreferredSize(check);
 
 
 //加入接口类
 lisener lisen=new lisener();
 //给按钮添加监听器
 butt.addActionListener(lisen);
 //让监听器的文本框和处理的文本框对应
 lisen.nameinput=register;
 lisen.passinput=word;
 //让监听器的框与此相同
 lisen.jiemian=frame;
 
 word.addActionListener(lisen);
 
 /*
 //加入接口
 Listener2 lisen1=new Listener2();
 //添加监听器
 word.addKeyListener(lisen1);
 //对应文本框和密码框
 lisen1.name1=register;
 lisen1.pass1=word;
 lisen1.frame=frame;
 */
 //设置界面可见
 frame.setVisible(true);
 
 }
 public static void main(String[] args){
 UI ui=new UI();
 ui.showIU();
 }
}

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

import javax.swing.JDialog;
import javax.swing.JTextField;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
public class lisener implements ActionListener{
 JTextField nameinput;
 JTextField passinput;
 JFrame jiemian;
 public void actionPerformed(ActionEvent e){
 System.out.println("鼠标点击了");
 String name=nameinput.getText();
 String password=passinput.getText();
 if(name.equals("majunlong")&&password.equals("12345678")){
  System.out.println("登陆成功");
  jiemian.dispose();
 }
  
  
 else{
  System.out.println("登陆失败");
  JOptionPane pane=new JOptionPane();
  JOptionPane.showMessageDialog(null, "登陆失败", "警告", JOptionPane.ERROR_MESSAGE);
  
 }
  
 
 }

}

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JTextField;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class Listener2 implements KeyListener{
 JTextField name1;
 JFrame frame;
 JTextField pass1;

 public void keyTyped(KeyEvent e) {
 // TODO Auto-generated method stub
 
 
 }

 public void keyPressed(KeyEvent e) {
 // TODO Auto-generated method stub
 
 }

 public void keyReleased(KeyEvent e) {
 // TODO Auto-generated method stub
 System.out.println("鼠标点击了");
 String name=name1.getText();
 String password=pass1.getText();
 if(name.equals("majunlong")&&password.equals("12345678")){
  System.out.println("登陆成功");
  frame.dispose();
 }
  
  
 else{
  System.out.println("登陆失败");
  JOptionPane pane=new JOptionPane();
  
  JOptionPane.showMessageDialog(null, "登陆失败", "警告", JOptionPane.ERROR_MESSAGE);
  
 }
  
 
 }
 }