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17)Write a Java program to design a screen using Awt that will take a user name and password. If the user name and password are not same, raise an Exception with appropriate message. User can have 3 login chances only. Use clear button to clear the TextFields. [Marks 30]


                        	

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;


class InvalidPasswordException extends Exception

{}


class Slip17 extends JFrame implements ActionListener

{

    JLabel name, pass;

    JTextField nameText;

    JPasswordField passText;

    JButton login, end;

    static int cnt=0;

   
    Slip17()

    {

         name = new JLabel("Name : ");

         pass = new JLabel("Password : ");


         nameText = new JTextField(20);

         passText = new JPasswordField(20);


         login = new JButton("Login");

         end = new JButton("End");


         login.addActionListener(this);

          end.addActionListener(this);              
   

               
          setLayout(new GridLayout(3,2));

          add(name);

          add(nameText);

          add(pass);

          add(passText);

          add(login);

          add(end);


          setTitle("Login Check");

          setSize(300,300);                              
                         
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

          setVisible(true);

     }


     public void actionPerformed(ActionEvent e)

     {

               if(e.getSource()==end)

          {

                        System.exit(0);

   

          }

          if(e.getSource()==login)

          {

             try

             {

                 String user = nameText.getText();

                 String pass = new String(passText.getPassword());

                 
                 if(user.compareTo(pass)==0)

                 {  JOptionPane.showMessageDialog(null,"Login Successful","Login",JOptionPane.INFORMATION_MESSAGE);

                     System.exit(0);

                  }


                  else

                  {

                      throw new InvalidPasswordException();

                  }

                }

                catch(Exception e1)

                {

                    cnt++;

                    JOptionPane.showMessageDialog(null,"Login Failed","Login",JOptionPane.ERROR_MESSAGE);

                     nameText.setText("");

                     passText.setText("");

                     nameText.requestFocus();

                     if(cnt == 3)

                    {

           JOptionPane.showMessageDialog(null,"3 Attempts Over","Login",JOptionPane.ERROR_MESSAGE);

                        System.exit(0);           

                                       
                     }

                }       

         }               

   }


  public static void main(String args[])

 {

                new Slip17();

 }

}

17)Write a Java program to design a screen using Awt that will take a user name and password. If the user name and password are not same, raise an Exception with appropriate message. User can have 3 login chances only. Use clear button to clear the TextFields. [Marks 30]

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