课堂作业之登录窗口

题目：

源代码：

package org.java.application;

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 zhanghao;//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) { 
		zhanghao = tfzh.getText();
		mima = pf.getText();

		if(zhanghao.equals("zhangyan") && mima.equals("162507233") )
			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();

	}


}