LoginDemo.java

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

class Student {
  private String username;
  private String pwd;
  private String cnfm_pwd;
  private int maths;
  private int chemistry; 
  private int physics;

  public Student(String username, String pwd, String cnfm_pwd){
    this.username = username;
    this.pwd = pwd;
    this.cnfm_pwd = cnfm_pwd;
    System.out.println("student record created successfully ");

  }

  public void setMarks(int maths,int chemistry, int physics){
    this.maths = maths;
    this.chemistry = chemistry;
    this.physics = physics;
  }

  public double getAverage(){
    return (double )(this.maths + this.chemistry +this.physics)/3.0;
  }


  
}
class NextPage extends JFrame 
{ 
  NextPage() 
  { 
  setDefaultCloseOperation(javax.swing. 
  WindowConstants.DISPOSE_ON_CLOSE); 
  setTitle("Welcome"); 
  setSize(400, 200); 
  } 
} 

class Login extends JFrame implements ActionListener 
{ 
JButton SUBMIT; 
JPanel panel; 
JLabel label1,label2,label3, label4,label5,label6; 
final JTextField text1,text2,text3,mark1,mark2,mark3; 
Login() 
{ 
label1 = new JLabel(); 
label1.setText("Username:"); 
text1 = new JTextField(15); 

label2 = new JLabel(); 
label2.setText("Password:"); 
text2 = new JPasswordField(15); 

label3 = new JLabel(); 
label3.setText("confirm Password:"); 
text3 = new JPasswordField(15); 

label4 = new JLabel(); 
label4.setText("Physics "); 
mark1 = new JTextField(15); 

label5 = new JLabel(); 
label5.setText("Chemistry "); 
mark2  = new JTextField(15); 

label6 = new JLabel(); 
label6.setText("maths :"); 
mark3 = new JTextField(15); 




SUBMIT=new JButton("SUBMIT"); 

panel=new JPanel(new GridLayout(15,4)); 
panel.add(label1); 
panel.add(text1); 
panel.add(label2); 
panel.add(text2); 
panel.add(label3);
panel.add(text3);


panel.add(label4);
panel.add(mark1);

panel.add(label5);
panel.add(mark2);

panel.add(label6);
panel.add(mark3);





panel.add(SUBMIT); 
add(panel,BorderLayout.CENTER); 
SUBMIT.addActionListener(this); 
setTitle("LOGIN FORM"); 
} 
public void actionPerformed(ActionEvent ae) 
{ 
  String value1=text1.getText(); 
  String value2=text2.getText(); 
  String value3 =text3.getText();
  int physics =  Integer.parseInt(mark1.getText()) ;
  int chemistry = Integer.parseInt(mark2.getText()) ;
  int maths = Integer.parseInt(mark3.getText()) ;
  boolean password_check  = true ; 


  if(!value3.equals(value2)){
     JOptionPane.showMessageDialog(this,"passwords do not match ", 
    "Error",JOptionPane.ERROR_MESSAGE); 
    password_check = false; 

  }




  if (password_check)
  {
    if (!value1.isEmpty()) { 
      Student s = new Student(value1,value2,value3);
      s.setMarks(physics,chemistry,maths);

      NextPage page=new NextPage(); 
      page.setVisible(true); 
      JLabel label = new JLabel("Welcome:"+value1 + "\n account created successfully!" + "your average mark is " + s.getAverage());
      page.getContentPane().add(label); 
    } 
    else{ 
    System.out.println("enter the valid username and password"); 
    JOptionPane.showMessageDialog(this,"username can't be blank", 
    "Error",JOptionPane.ERROR_MESSAGE); 
    } 
  } 
} 
}
class LoginDemo 
{ 
  public static void main(String arg[]) 
  { 
    try 
    { 
      Login frame=new Login(); 
      frame.setSize(500,200); 
      frame.setVisible(true); 
    } 
    catch(Exception e) {JOptionPane.showMessageDialog(null, e.getMessage());
      } 
  } 
}