按要求设计登陆窗口界面

/*
* 设计登录窗口界面
*/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

@SuppressWarnings("serial")
public class Loginwindow extends JFrame implements ActionListener{
JLabel lbzh, lbmm,lbconfirm;//声明帐号、密码、确认标签组件
JPasswordField pf;//声明输入密码框组件
JTextField tfzh;//声明输入帐号文本框组件
JButton btLogin;//声明登陆按钮组件
String yangximei;//声明变量账号
String mima;//声明变量密码

@SuppressWarnings("static-access")
Loginwindow(){
JFrame jf = new JFrame("登录窗口");
jf.setVisible(true); //设置窗体可见
jf.setSize(500, 200);//设置窗口初显大小
jf.setLocationRelativeTo(null);

JPanel jp=new JPanel();
jp.setLayout(new BorderLayout(5,10));// 构造一个边界布局
JPanel jpTop = new JPanel();

jpTop.setLayout(new GridLayout(2,2,5,5));

JPanel jpInfo = new JPanel();
jpInfo.setLayout(new FlowLayout());

JPanel jpbtLogin = new JPanel();
jpbtLogin.setLayout(new FlowLayout());

lbzh=new JLabel("帐号",lbzh.CENTER);//创建组件并赋值
lbmm=new JLabel("密码",lbmm.CENTER);
lbconfirm=new JLabel(" ");

tfzh=new JTextField(15);
pf=new JPasswordField(15);

btLogin=new JButton("登录");
btLogin.addActionListener(this);

jpTop.add(lbzh);
jpTop.add(tfzh);
jpTop.add(lbmm);
jpTop.add(pf);

jpInfo.add(lbconfirm);

jpbtLogin.add(btLogin);

jp.add(jpTop,BorderLayout.NORTH);
jp.add(jpInfo,BorderLayout.CENTER);
jp.add(jpbtLogin,BorderLayout.SOUTH);

jf.add(jp);

}
@SuppressWarnings("deprecation")
public void actionPerformed(ActionEvent e) {
yangximei = tfzh.getText();
mima = pf.getText();

if(yangximei.equals("yangximei") && mima.equals("162507232") )
lbconfirm.setText("登录成功");
else
lbconfirm.setText("帐号或密码有误，请重新输入");
}

public static void main(String[] args) {

new Loginwindow();

}

}