I need the functions such as (variables) of this code to be changed and add comm

Question

I need the functions such as (variables) of this code to be changed and add comments! it is to be displayed in GUI java.

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import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

@SuppressWarnings("serial")
public class PinPad extends JFrame implements ActionListener{
   JPanel mainP=new JPanel();
   JPanel lablP=new JPanel();
   JPanel pnlN=new JPanel();
   JPanel buttonP=new JPanel();
   JLabel pinL=new JLabel("Enter PIN: ",SwingConstants.CENTER);
   JLabel welc=new JLabel("Welcome to IIT Trust Bank!",SwingConstants.CENTER);
   JPasswordField pw=new JPasswordField(4);
  
   JButton button0=new JButton(0+"");
   JButton button1=new JButton(1+"");
   JButton button2=new JButton(2+"");
   JButton button3=new JButton(3+"");
   JButton button4=new JButton(4+"");
   JButton button5=new JButton(5+"");
   JButton button6=new JButton(6+"");
   JButton button7=new JButton(7+"");
   JButton button8=new JButton(8+"");
   JButton button9=new JButton(9+"");
   JButton ent=new JButton("Enter");
   JButton backsp=new JButton("<--");
  
   public PinPad() {
       super("Swing Window");
       setSize(300,210);
       setDefaultCloseOperation(EXIT_ON_CLOSE );
      
       lablP.setLayout(new BorderLayout());
       lablP.add(welc,BorderLayout.NORTH);
       lablP.add(pinL,BorderLayout.CENTER);
       lablP.add(pw,BorderLayout.SOUTH);
      
       buttonP.add(button1);
       buttonP.add(button2);
       buttonP.add(button3);
       buttonP.add(button4);
       buttonP.add(button5);
       buttonP.add(button6);
       buttonP.add(button7);
       buttonP.add(button8);
       buttonP.add(button9);
       buttonP.add(ent);
       buttonP.add(button0);
       buttonP.add(backsp);
      
       buttonP.setLayout(new GridLayout(4,3,8,2));
      
       mainP.setLayout(new BorderLayout());
       mainP.add(lablP,BorderLayout.CENTER);
       mainP.add(buttonP,BorderLayout.SOUTH);
      
       button1.addActionListener(this);
       button2.addActionListener(this);
       button3.addActionListener(this);
       button4.addActionListener(this);
       button5.addActionListener(this);
       button6.addActionListener(this);
       button7.addActionListener(this);
       button8.addActionListener(this);
       button9.addActionListener(this);
       button0.addActionListener(this);
       ent.addActionListener(this);
       backsp.addActionListener(this);
       add(mainP);
      
       setVisible(true);
   }

   @SuppressWarnings("deprecation")
   @Override
   public void actionPerformed(ActionEvent e) {
       if(e.getSource()==button0){
           pw.replaceSelection(button0.getText());
       }
       else if(e.getSource()==button1){
           pw.replaceSelection(button1.getText());
       }
       else if(e.getSource()==button2){
           pw.replaceSelection(button2.getText());
       }
       else if(e.getSource()==button3){
           pw.replaceSelection(button3.getText());
       }
       else if(e.getSource()==button4){
           pw.replaceSelection(button4.getText());
       }
       else if(e.getSource()==button5){
           pw.replaceSelection(button5.getText());
       }
       else if(e.getSource()==button6){
           pw.replaceSelection(button6.getText());
       }
       else if(e.getSource()==button7){
           pw.replaceSelection(button7.getText());
       }
       else if(e.getSource()==button8){
           pw.replaceSelection(button8.getText());
       }
       else if(e.getSource()==button9){
           pw.replaceSelection(button9.getText());
       }
       else if(e.getSource()==ent){
           int result = Integer.parseInt(pw.getText());
           if(result == 1234){
               JOptionPane.showMessageDialog(new JFrame(),"Correct PIN!");
               this.dispose();
               new A_clientGui();
           }
           else
               JOptionPane.showMessageDialog(new JFrame(),"Wrong PIN!");
       }
       else if(e.getSource()==backsp){
           pw.setText (pw.getText ().substring (0, pw.getText ().length () - 1));
       }
      
      
   }
}

Explanation / Answer

import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; @SuppressWarnings("serial") public class PinPad extends JFrame implements ActionListener{ JPanel mainPanel =new JPanel(); // to hold all controls JPanel labelPanel =new JPanel(); // to hold lables JPanel buttonPanel =new JPanel(); // to hold buttons JLabel pinPromptLabel =new JLabel("Enter PIN: ",SwingConstants.CENTER); JLabel welcomeLabel =new JLabel("Welcome to IIT Trust Bank!",SwingConstants.CENTER); JPasswordField passwordField =new JPasswordField(4); // creating different buttons JButton button0=new JButton(0+""); JButton button1=new JButton(1+""); JButton button2=new JButton(2+""); JButton button3=new JButton(3+""); JButton button4=new JButton(4+""); JButton button5=new JButton(5+""); JButton button6=new JButton(6+""); JButton button7=new JButton(7+""); JButton button8=new JButton(8+""); JButton button9=new JButton(9+""); JButton enterButton =new JButton("Enter"); JButton baskspaceButton =new JButton("

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