import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Login extends Applet implements ActionLister{
TextField username=new TextField();
TextField password=new TextField();
password.setEchoChar('*');
Label label1=new Label("请输入用户名:");
Label label2=new Label("请输入密码:");
Button button1=new Button("确定");
Button button2=new Button("取消");
private Label message=new Label();
public void init(){
add(label1); add(username);
add(label2); add(password);
add(button1); add(button2);
button1.addActionListener(this);
button2.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button1)
{ if(username.getText().length()==0)
message.setText("请输入用户名:");
if(username.getText()=="user"&&password.getText()=="111")
message.setText("欢迎您"+username.getText()+"光临本网站!");
else
message.setText("用户名或密码不正确!");
}
if(e.getSource()==button2)
{ username.getText()="";
password.getText()="";
}
}
import java.applet.*;
import java.awt.event.*;
public class Login extends Applet implements ActionLister{
TextField username=new TextField();
TextField password=new TextField();
password.setEchoChar('*');
Label label1=new Label("请输入用户名:");
Label label2=new Label("请输入密码:");
Button button1=new Button("确定");
Button button2=new Button("取消");
private Label message=new Label();
public void init(){
add(label1); add(username);
add(label2); add(password);
add(button1); add(button2);
button1.addActionListener(this);
button2.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button1)
{ if(username.getText().length()==0)
message.setText("请输入用户名:");
if(username.getText()=="user"&&password.getText()=="111")
message.setText("欢迎您"+username.getText()+"光临本网站!");
else
message.setText("用户名或密码不正确!");
}
if(e.getSource()==button2)
{ username.getText()="";
password.getText()="";
}
}
{ username.getText()="";
password.getText()="";
}这个作什么???想清除文本框的内容吗?
username.setText(null);
password.setText(null);
import java.applet.*;
import java.awt.event.*;
/*
<title>Test</title>
<hr>
<applet code="Test.class" width=250 height=175>
</applet>
<hr>
*/
public class Test extends Applet implements ActionListener{
TextField username=new TextField();
TextField password=new TextField(); Label label1=new Label("请输入用户名:");
Label label2=new Label("请输入密码:");
Button button1=new Button("确定");
Button button2=new Button("取消");
private Label message=new Label();public void init(){
password.setEchoChar('*');//------------------------
add(label1); add(username);
add(label2); add(password);
add(message);//---------------
add(button1); add(button2);button1.addActionListener(this);
button2.addActionListener(this);
} public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button1)
{ if(username.getText().length()==0)
{message.setText("请输入用户名:");return;}//--------------------
if(username.getText().equals("user")&&password.getText().equals("111"))//---
message.setText("欢迎您"+username.getText()+"光临本网站!");
else
message.setText("用户名或密码不正确!");
}
if(e.getSource()==button2)
{ username.setText(null);//-----------------------
password.setText(null);//------------------------
}
}}
看标注//------------------------