用AWT组件实现登录对话框

　　作者:Javazealot

/*本程序是模拟的中文Java技术网的登录窗口,用AWT组件实现的,不过还有一些需要完善的地方,所以我希望能得到各位Java爱好者的建议*/

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

//对话框创建

class okcanceldialog extends Dialog implements ActionListener
{
Panel p;
Label top,name,passWord;
TextField inputname,inputpassword;
Button ok,cancel;
String data;
okcanceldialog(Frame hostFrame,String title,boolean dModal)
{
super(hostFrame,title,dModal);
p=new Panel();
p.setLayout(new FlowLayout());
setSize(300,200);
setLayout(new GridBagLayout());//用网格包装布局为放置组件
GridBagConstraints gbb=new GridBagConstraints();
top=new Label("登录窗口 ");
gbb.gridx=1;
gbb.gridy=0;//在第一行显示top标签
add(top,gbb);

name=new Label("会员名:");
gbb.gridx=GridBagConstraints.RELATIVE;
gbb.gridy=1;//在第二行显示会员名标签和相应文本框
add(name,gbb);
inputname=new TextField(20);
add(inputname,gbb);

password=new Label("密码:");
gbb.gridx=GridBagConstraints.RELATIVE;
gbb.gridy=2;在第二行显示密码标签和相应文本框
add(password,gbb);
inputpassword=new TextField(20);

add(inputpassword,gbb);
inputpassword.setEchoChar(´*´);

ok=new Button("确定");
p.add(ok);
ok.addActionListener(this);

cancel=new Button("放弃");
p.add(cancel);
cancel.addActionListener(this);
p.add(new Label(" "));//将两个按钮和一个含有很多空格的标签加入板(注:标签的 //作用是为了把按钮挤在中间)
gbb.gridx=1;
gbb.gridy=3;//在第四行显示板

add(p,gbb);
data=new String();

addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){System.exit(0);}});//用以关闭窗 //口

}

public void actionPerformed(ActionEvent event)
{
if(event.getSource()==ok){
data=" 您好,"+inputname.getText()+",欢迎光临中文Java技术网!";
}else if(event.getSource()==cancel){
data=" 你没有输入! ";
}
setVisible(false);
}
}

//窗口创建
class dialogframe extends Frame implements ActionListener
{
Label firstpage,word;
Button enter;
okcanceldialog dialog;
dialogframe(String title)
{
super(title);
setLayout(new GridBagLayout());
GridBagConstraints gbc=new GridBagConstraints();

firstpage=new Label("Welcome to cn-java net");

enter=new Button("会员登录");
gbc.gridy=0;
add(firstpage,gbc);

word=new Label(" 您还没有登录 ");
gbc.gridx=GridBagConstraints.RELATIVE;
gbc.gridy=1;
add(enter,gbc);

enter.addActionListener(this);
gbc.gridx=GridBagConstraints.RELATIVE;
gbc.gridy=2;//在第三行显示欢迎词
add(word,gbc);
dialog=new okcanceldialog(this,"登录",true);

}

public void actionPerformed(ActionEvent event)
{
if(event.getSource()==enter){
dialog.setVisible(true);
word.setText(dialog.data);
}
} //此方法用来显示对话框
}

//主类
public abstract class mainclass implements ActionListener
{
public static void main(String[] args)
{
dialogframe f=new dialogframe("Welcome");//创建窗口实例
f.setSize(300,200);
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){System.exit(0);}});
f.show();
}
}

附:本程序已通过调试,没有任何错误.