简单登陆验证码界面代码

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JLabel;
import java.awt.Dimension;
import javax.swing.JPasswordField;
public class Number extends JFrame implements ActionListener{

private JLabel usernameLabel;
private JTextField usernameTextField;
private JLabel passwordLabel;
private JTextField passwordField;
private JLabel NumberLabel;
private JTextField NumberField;
private JLabel ramstr;
private JLabel haha;
private JButton bu1;
private JButton bu2;

public void add(JFrame frame) {

frame.setTitle("请登录");
frame.setLayout(null);

usernameLabel =new JLabel("登录名");
usernameLabel.setBounds(60, 40, 70, 30);
usernameLabel.setFont(new Font("黑体",Font.BOLD,16));
usernameTextField =new JTextField();
usernameTextField.setBounds(140,45,120,20);
usernameTextField.setFont(new Font("宋体",Font.BOLD,16));
usernameTextField.setHorizontalAlignment(JTextField.CENTER);

passwordLabel =new JLabel("密码");
passwordLabel.setBounds(60, 70, 70, 30);
passwordLabel.setFont(new Font("黑体",Font.BOLD,16));
passwordField =new JPasswordField();
passwordField.setBounds(140,75,120,20);
passwordField.setFont(new Font("宋体",Font.BOLD,16));
haha =new JLabel("忘记用户名/密码？");
haha.setForeground(Color.blue);
haha.setBounds(260, 70, 140, 30);
haha.setFont(new Font("汉真广标",Font.BOLD,10));

NumberLabel =new JLabel("验证码");
NumberLabel.setBounds(60, 100, 70, 30);
NumberLabel.setFont(new Font("黑体",Font.BOLD,16));
NumberField =new JTextField();
NumberField.setBounds(140,105,60,20);
NumberField.setFont(new Font("宋体",Font.BOLD,16));

String result = "";
for(int i = 0 ; i < 6 ; i++)
{
int intVal = (int)(Math.random() * 26 + 97);
result = result + (char)intVal;
}
ramstr =new JLabel(result);
ramstr.setBounds(220, 100, 70, 30);
ramstr.setFont(new Font("汉真广标",Font.BOLD,16));

bu1=new JButton();
bu1.setText("Enter");
bu1.setBackground(Color.RED);
bu1.setForeground(Color.blue);
bu1.setBounds(120, 145,120,30);
getContentPane().add(bu1);
bu2=new JButton();
bu2.setText("Fast Register");
bu2.setBounds(120, 185,120,30);
getContentPane().add(bu2);

frame.add(usernameLabel);
frame.add(usernameTextField);
frame.add(passwordLabel);
frame.add(passwordField);
frame.add(haha);
frame.add(NumberLabel);
frame.add(NumberField);
frame.add(ramstr);
frame.add(bu1);
frame.add(bu2);
}

public static void main(String []args){
JFrame frame =new JFrame("JFrame窗口");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,300);
Dimension displaySize =Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize= frame.getSize();
if(frameSize.width>displaySize.width)
frameSize.width=displaySize.width;
if(frameSize.height>displaySize.height)
frameSize.height=displaySize.height;
frame.setLocation((displaySize.width-frameSize.width),(displaySize.height-frameSize.height));
Number Swing=new Number();
Swing.add(frame);
frame.setVisible(true);
}
}