untitled1.java

这是用JAVA编写的简单的登陆程序,希望大家喜欢,特简单

package test;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JOptionPane;
/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2006</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class Untitled1 {
    public static void main(String args[])
    {
            final Frame frmFrame=new Frame();
            Panel pnlPanel=new Panel();
            Label lblUsename=new Label("用户名");
            Label lblPassword=new Label("密码");
            final TextField  txtUsename=new TextField("管理员");
            final TextField  txtPassword=new TextField(" ",8);
            txtUsename.setEditable(false);
            txtPassword.setEchoChar('*');
            Button btnButton1=new Button("登陆");
            Button btnButton2=new Button("其他用户登录");
            Button btnButton3=new Button("关闭");
            btnButton1.addActionListener(new ActionListener()
            {
                    public void actionPerformed(ActionEvent e)
                    {
                            if((txtPassword.getText()).length()==0)
                            {
                                    JOptionPane.showMessageDialog(frmFrame,"密码不能为空");
                                    return;
                            }
                            txtPassword.setColumns(16);
                            System.out.println(txtUsename.getText()+"用户的密码："+txtPassword.getText());
                    }
            });
            btnButton2.addActionListener(new ActionListener()
            {
                    public void actionPerformed(ActionEvent e)
                    {
                            txtUsename.setEditable(true);
                    }
            });
            btnButton3.addActionListener(new ActionListener()
            {
                    public void actionPerformed(ActionEvent e)
                    {
                            System.exit(0);
                    }
            });
            pnlPanel.add(lblUsename);
            pnlPanel.add(txtUsename);
            pnlPanel.add(lblPassword);
            pnlPanel.add(txtPassword);
            pnlPanel.add(btnButton1);
            pnlPanel.add(btnButton2);
            pnlPanel.add(btnButton3);
            frmFrame.add(pnlPanel);
            frmFrame.setTitle("请输入密码!!");
            frmFrame.setBackground(Color.white);
            frmFrame.setLocation(250,250);
            frmFrame.pack();
            frmFrame.show();
		}
}