loading.java

学生信息管理系统,能显示登录,管理,查询,增添删除等功能

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.*;
import com.yanjun.*;

public class loading extends JFrame
{
     JLabel  L1=new JLabel("名称");
     JTextField txt=new JTextField(20);
     JLabel  L2=new JLabel("密码");
     JPasswordField pass = new JPasswordField(20);
     JButton b=new JButton("登陆");
     JButton b2=new JButton("注册");
     JButton b3=new JButton("退出");
     String [] types={"学生","教师","管理员"};
     JComboBox cb=new JComboBox();
     
     ActionListener a1=new ActionListener() 
     {
      public void actionPerformed(ActionEvent e)
  	  {
        String id1 = txt.getText();
  	    String id2=pass.getText();
  	    int id3=cb.getSelectedIndex();
  	    dispose();
  	    
  	    if(id3==0){
  	    if(link.check1(id1,id2))new Menu1(id1,"student");//学生信息界面
  	     else{
          JOptionPane.showMessageDialog(null, 
          "你的密码无效", "提示错误信息", 
          JOptionPane.ERROR_MESSAGE);
            }
  	    }
  	  if(id3==1){
    	    if(link.check2(id1,id2))new Menu2(id1,"teacher1");//教师信息界面
    	     else{
            JOptionPane.showMessageDialog(null, 
            "你的密码无效", "提示错误信息", 
            JOptionPane.ERROR_MESSAGE);
              }
    	    }
  	  
  	    if(id3==2){
        if(link.check(id1,id2))new Menu3(id1,"Admin");//管理员界面
  	    else{
                  JOptionPane.showMessageDialog(null, 
                  "你的密码无效", "提示错误信息", 
                  JOptionPane.ERROR_MESSAGE);
              }
  	    }
  	   }
       };
     ActionListener a2 = new ActionListener() 
     {
       public void actionPerformed(ActionEvent e)
	  {
    	   new Regedit();
	  }
     };
     ActionListener a3 = new ActionListener() 
     {
       public void actionPerformed(ActionEvent e)
	  {
    	   System.exit(0);
	  }
     };
    	    
	loading()
	{
	super("登陆与注册");
        Container cp = getContentPane();
        cp.setLayout(new FlowLayout());
        for(int i=0;i<types.length;i++)
        cb.addItem(types[i]);
        cp.add(L1);
	    cp.add(txt);
        cp.add(L2);
        cp.add(pass);
        cp.add(cb);
        cp.add(b);
        cp.add(b2);
        cp.add(b3);
        b.addActionListener(a1);
        b2.addActionListener(a2);
        b3.addActionListener(a3);
        setSize(275,150);
        show();
	 }
	
     public static void main(String args[])
	{  
         loading f=new loading();
         WAdapter windowAdapter = new WAdapter();
 		 f.addWindowListener(windowAdapter);
	}
}
class WAdapter extends WindowAdapter
{
	public void windowClosing(WindowEvent e)
	{
		System.exit(0);
	}
}