一个简单的登陆界面程序

mport java.awt.Dimension;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;

import javax.swing.JButton;

import javax.swing.JRadioButton;

import javax.swing.ButtonGroup;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

import java.awt.*;

public class Topo extends JFrame {

public static void main(String[] args) {

Topo topo=new Topo();

System.out.println("main（）结束");

}

public Topo(){

System.out.println("进入Topo");

final String userName1 = "abc";

final String userName2 = "";

final String passwrod1 = "123";

final String passwrod2 = "123";

JFrame jFrame = new JFrame("登陆界面");

Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();

jFrame.setBounds(((int)dimension.getWidth() - 400) / 2, ((int)dimension.getHeight() - 300) / 2, 400,250);

jFrame.setResizable(false);//禁止窗体改变大小

jFrame.setLayout(null);

jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel titleLabel = new JLabel("登陆界面");

titleLabel.setFont(new Font("宋体",Font.BOLD | Font.ITALIC,17));//设置标签字体

titleLabel.setBounds(140, 0,150 ,60 );

jFrame.add(titleLabel);

JLabel label1 = new JLabel("姓名");

label1.setFont(new Font("宋体",Font.BOLD | Font.ITALIC,17));//设置标签字体

label1.setBounds(140, 55, 50,20);

jFrame.add(label1);

JLabel label2 = new JLabel("密码");

label2.setFont(new Font("宋体",Font.BOLD | Font.ITALIC,17));//设置标签字体

label2.setBounds(140, 95, 50, 20);

jFrame.add(label2);

final JTextField text1 = new JTextField();

text1.setBounds(180, 50, 150, 30);

jFrame.add(text1);

final JPasswordField text2 = new JPasswordField();

text2.setBounds(180, 90, 150, 30);

jFrame.add(text2);

ButtonGroup buttonGroup = new ButtonGroup(); //单选按钮组

final JRadioButton radioButtonA = new JRadioButton("客户端", true);

radioButtonA.setBounds(50,145,80,20);

buttonGroup.add( radioButtonA);

jFrame.add(radioButtonA);

final JRadioButton radioButtonB = new JRadioButton("管理员端", false);

radioButtonB.setBounds(50,165,80,20);

buttonGroup.add( radioButtonB);

jFrame.add(radioButtonB);

JButton button = new JButton("登陆");

button.setBounds(250, 150, 60, 30);

jFrame.add(button);

button.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

if(radioButtonA.isSelected() && userName1.equals(text1.getText()) && passwrod1.equals(text2.getText()))

{

fram();//调用客户端方法frame();

JOptionPane.showMessageDialog(null, "欢迎使用客户端", "提示", JOptionPane.INFORMATION_MESSAGE);

}

else if(radioButtonB.isSelected() && userName2.equals(text1.getText()) && passwrod1.equals(text2.getText()))

{

gly();//调用客户端方法frame();

JOptionPane.showMessageDialog(null, "欢迎使用管理员端", "提示", JOptionPane.INFORMATION_MESSAGE);

}

else {

JOptionPane.showMessageDialog(null, "用户名或密码错误，请核对后重新输入", "提示", JOptionPane.ERROR_MESSAGE);

text1.setText("");

text2.setText("");

}

}

});

jFrame.add(button);

jFrame.setVisible(true);

}

public void fram()

{

TextArea area=new TextArea(10,40);

JLabel label=new JLabel("图");

JFrame f=new JFrame("客户端"); //框架

area.setFont(new Font("TimesRoman",Font.PLAIN, 28));

JButton button = new JButton("欢迎使用");

JPanel panel1=new JPanel();

JPanel panel2=new JPanel();

panel1.setLayout(new BorderLayout());

panel1.add(button);

panel2.add(label);

f.add(area);

f.add(panel1,"South");

f.add(panel2,"North");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//f.setLocation(300,50);//设置窗体弹出的坐标

f.setSize(1010,700);

f.setVisible(true);

}

public void gly(){

JFrame f; //定义各种构件

JButton button;

JLabel label=new JLabel("管理员端");

JPanel panel1=new JPanel();

JPanel panel2=new JPanel();

f=new JFrame("图"); //框架

panel1.setLayout(new BorderLayout());

panel2.add(label);

f.add(panel1,"South");

f.add(panel2,"North");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setSize(1010,700);

f.setVisible(true);

}

}

PS：新手上路。