firstlogin.java

秩序更改试题库

//导入所必须的包↓
import java.io.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.BoxLayout.*;
import javax.swing.JOptionPane;
import java.io.FileOutputStream;
//导入所必须的包↑
public class FirstLogin  extends Dialog implements ActionListener {
    Label nameLabel,passLabel;
    TextField nameText,passText;
    Button Bdenglu,Bquxiao;
    public String bb;
    public int a=0;
    public FirstLogin(Frame f,String s,boolean b) {
        super(f,s,true);
        //让对话框居中显示↓
        Toolkit tool=getToolkit();
        Dimension dim=tool.getScreenSize();
        setBounds(dim.width/2-130,dim.height/2-70,260,140);
        //让对话框居中显示↑
        nameLabel=new  Label("用户名：");
        passLabel=new  Label("密　码：");
        nameText=new TextField(20);
        passText=new TextField(20);
        Bdenglu=new Button("登录");
        Bquxiao=new Button("取消");
        setLayout(new FlowLayout());
        add(nameLabel);
        add(nameText);
        add(passLabel);
        add(passText);
        passText.setEchoChar('*');
        add(Bdenglu);Bdenglu.addActionListener(this);
        add(Bquxiao);Bquxiao.addActionListener(this);
        setVisible(true);
    }
    public String getMessage()
    {
        return bb;
    }
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==Bdenglu)
        {
           if(nameText.getText().equals("admin") && passText.getText().equals("root"))
           {
               bb=nameText.getText();
               this.setVisible(false);
           }
           else
           {
               a+=1;
               if(a==3)
               {
                   JOptionPane.showMessageDialog(this,"对不起！您的错误次数输入过多！程序退出！");
                   System.exit(0);
               }
               JOptionPane.showMessageDialog(this,"登录失败！请重新登录！");

           }
        }
        if(e.getSource()==Bquxiao)
        {
            System.exit(0);
        }
    }
}