EngAMT.java

import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class EngAMT extends JFrame implements ActionListener{

    JFrame frame;
    JLabel bankLabel;
    JLabel textfield=new JLabel();
    JButton[] numButtons=new JButton[10];  
    JPanel panel;
    JButton delButton,OkButton;
    String Amount;

    Font myFont = new Font("Dialog", Font.BOLD, 30);

    public EngAMT(){

                        // defining the frame;
        frame = new JFrame("Pawan Bank PVT LTD");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(750, 750);
        frame.setLayout(null);
        frame.getContentPane().setBackground(new Color(0, 0,0));


                // Defining the heading
        bankLabel = new JLabel("Enter the Amount");
        bankLabel.setFont(myFont);
        bankLabel.setForeground(new Color(192,192,192));
        bankLabel.setBounds(200, 100, 500, 50);

        //defining the textfield
        textfield.setBackground(new Color(229, 243, 214));
        textfield.setForeground(new Color(255,0,0)); 
        textfield.setBounds(170,160,300,50);
        textfield.setFont(myFont);
        textfield.setEnabled(false);
        textfield.setOpaque(true);

        //defining the Numbers
        for (int i = 0; i < 10; i++) {
                numButtons[i]=new JButton(String.valueOf(i));
                numButtons[i].addActionListener(this);
                numButtons[i].setFont(myFont);
                numButtons[i].setFocusable(false);
        }
                // defining the Delete button
        delButton=new JButton("del");
        delButton.addActionListener(this);
        delButton.setFont(myFont);
        delButton.setContentAreaFilled(true);
        delButton.setFocusable(false);
        delButton.setBounds(170, 460, 90, 70);

                    //defining The Okay Button
        OkButton=new JButton("Ok");
        OkButton.addActionListener(this);
        OkButton.setFont(myFont);
        OkButton.setFocusable(false);
        OkButton.setContentAreaFilled(true);
        OkButton.setBounds(380, 460, 90, 70);

        //  Defining the Panel.
        panel=new JPanel();
        panel.setBounds(170,230,300,299);
        panel.setLayout(new GridLayout(4,4,10,10));
        panel.setBackground(Color.BLACK);

        panel.add(numButtons[1]);
        panel.add(numButtons[2]);
        panel.add(numButtons[3]);

        panel.add(numButtons[4]);
        panel.add(numButtons[5]);
        panel.add(numButtons[6]);

        panel.add(numButtons[7]);
        panel.add(numButtons[8]);
        panel.add(numButtons[9]);

        panel.add(new JLabel(" "));
        panel.add(numButtons[0]);


        frame.add(panel);
        frame.setLayout(null);
        frame.add(textfield);
        frame.add(bankLabel);
        frame.add(delButton);
        frame.add(OkButton);
        frame.setVisible(true);
    }

@Override
public void actionPerformed(ActionEvent e){
        Amount="";
        for (int i = 0; i < 10; i++) {
        if (e.getSource() == numButtons[i]) {
            Amount += String.valueOf(i);
            textfield.setText(textfield.getText().concat(Amount));
        }
    }
        if(e.getSource()==delButton){
            String string=textfield.getText();
            textfield.setText("");
            for (int i = 0; i < string.length()-1; i++) {
                textfield.setText(textfield.getText()+string.charAt(i));
            }
        }
        
        if (e.getSource()==OkButton){ 

         DBconn dbConn=new DBconn(); 
         double balance = dbConn.getBalance(1234,"120");
         double amt= Double.parseDouble(Amount);;
            if (amt>balance) {
                new EngOFO();
            }else{
            // Calculate the new balance after deducting Amount
            double newBalance = balance - amt;
            // Update the balance in the database
            dbConn.updateBalance(1234, "120", newBalance);
            new EngDONE();
            }
            for (int i = 0; i < numButtons.length; i++) {
                numButtons[i].setEnabled(false);
                delButton.setEnabled(false);
                OkButton.setEnabled(false);
            }
        }
}    
// public static void main(String[] args) {
//     new EngAMT();
// }
}