GUI.java

import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.sql.*;

public class GUI 
{
     JFrame jf1 = new JFrame("Welcome to The Multiple Choice Quiz System");
     
     JLabel username = new JLabel("USERNAME");
	 JTextField jtf_username = new JTextField(10);
	 JPanel u = new JPanel();
	 
	 JLabel password = new JLabel("PASSWORD");
	 JPasswordField jpf = new JPasswordField(10);
	 JPanel p = new JPanel();
     
	 JButton login = new JButton("LOGIN");
	 JButton Signup  = new JButton("SIGN UP");
	 JButton Delete  = new JButton("DELETE ACCOUNT");
	 JPanel lc = new JPanel();
	 
	 JLabel message = new JLabel("");
	 JTextField message_out = new JTextField(50);
	 
	 GUI()
     {
    	 jf1.setSize(500,200);
    	 jf1.setVisible(true);
    	 jf1.setDefaultCloseOperation(jf1.EXIT_ON_CLOSE);
    	 BoxLayout boxLayout = new BoxLayout(jf1.getContentPane(), BoxLayout.Y_AXIS);
    	 jf1.setLayout(boxLayout);
    	 jf1.setLocation(500,150);
    	 
    	 
    	 jpf.setEchoChar('*');
    	 //u.setLayout(new FlowLayout());
    	 u.add(username);
    	 u.add(jtf_username);
    	 p.add(password);
    	 p.add(jpf);
    	 jf1.add(u);
		 jf1.add(p);
    	
    	 
    	 
    	 lc.add(login);
    	 login.addActionListener(new Handler());
		 
    	 lc.add(Signup);
    	 Signup.addActionListener(new Handler());
    	 lc.add(Delete);
    	 Delete.addActionListener(new Handler());
    	 jf1.add(lc);
    	  
    	
    	 jf1.add(message);
    	 jf1.add(message_out);
    	 message_out.setText("*Please Login or Signup For Login*"+'\n');
    	 message_out.setFont(new Font("Arial", 5, 20));
    	  	 
    	
    	 
         
     }
     
     boolean login(String username,String password) throws Exception
    {
    	 int i=1;
    	 try
    	  {
     	    Class.forName("com.mysql.jdbc.Driver");
     	    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/Multiple_Choice_Quiz_System","root","");
     	    Statement stat1 = con.createStatement(); 
     	    Statement stat2 = con.createStatement();
     	    ResultSet rs1;
     	    ResultSet rs2;
     	    rs1 = stat1.executeQuery("select name from Student_Info");
     	    rs2 = stat2.executeQuery("select password from Student_Info");
     	    rs1.next();
     	    rs2.next();
     	    
     	    do
     	     {
     	    	if( (username.equals(rs1.getString(i))==true) && (password.equals(rs2.getString(i))) )
     	    	{return(true);}
     	    
     	     }
			  while(rs1.next()!=false && rs2.next()!=false);
     	   con.close();
          }
        catch(ClassNotFoundException cnfe)
            { 
			  cnfe.printStackTrace(); 
		    }
    
      return(false);
      
    }
    
	 
	 
	 class Handler implements ActionListener
     {
   
    	public void actionPerformed(ActionEvent e) 
    	 {
    		 if( e.getSource()==login)
    		   {
    			      char[] check1 = jpf.getPassword();
    			      String check2 = jtf_username.getText();
    			      String check3 = new String(check1);
			     
    			      try {
						if(login(check2,check3)==true)
						   { 
						       jf1.dispose();
						       GUI_AfterLogin page2 = new GUI_AfterLogin(); 
          
						   }
						  else
						   {
						       message_out.setText("Username or password may be incorrect !!!!");
						   }
					} catch (Exception e1) 
					{
						// TODO Auto-generated catch block
						e1.printStackTrace();
					} 
    		    }
    		 
    		   else if(e.getSource()==Signup)
    		   {
    			       jf1.dispose();
    			       GUI_SignUp page3 = new GUI_SignUp();
    		   }
    		   else if(e.getSource()==Delete)
    		   {
    			       jf1.dispose();
    			       GUI_DeleteAccount page4 = new GUI_DeleteAccount();
    		   }
    		 
    	       
    	 }
     }
     
  
     


}