U23AE1034_GUI Calculator

[olad-emma]

Import javax.swing.;
Import java.awt.;
Import java.awt.event.ActionEvent;
Import java.awt.event.ActionListener;

Public class GUICalculatorForAed4 extends JFrame implements ActionListener {
Private JTextField display;
Private String operator;
Private double num1, num2, result;

Public GUICalculatorForAed4() {
    setTitle(“GUI Calculator – Aerospace Group 4”);
    setSize(400, 500);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLayout(new BorderLayout());

    // Welcome Message
    JLabel welcomeLabel = new JLabel(“Welcome to GUI Calculator! By Aerospace Group 4”, SwingConstants.CENTER);
    Add(welcomeLabel, BorderLayout.NORTH);

    // Display Field
    Display = new JTextField();
    Display.setEditable(false);
    Display.setFont(new Font(“Arial”, Font.BOLD, 24));
    Add(display, BorderLayout.CENTER);

    // Buttons Panel
    JPanel panel = new JPanel();
    Panel.setLayout(new GridLayout(5, 4, 5, 5));

    String[] buttons = {
        “7”, “8”, “9”, “/”,
        “4”, “5”, “6”, “*”,
        “1”, “2”, “3”, “-“,
        “0”, “C”, “=”, “+”,
        “^”, “%”, “√”
    };

    For (String text : buttons) {
        JButton button = new JButton(text);
        Button.setFont(new Font(“Arial”, Font.BOLD, 18));
        Button.addActionListener(this);
        Panel.add(button);
    }

    Add(panel, BorderLayout.SOUTH);
    setVisible(true);
}

Public void actionPerformed(ActionEvent e) {
    String command = e.getActionCommand();

    Try {
        If (command.matches(“[0-9]”)) {
            Display.setText(display.getText() + command);
        } else if (command.equals(“C”)) {
            Display.setText(“”);
            Num1 = num2 = result = 0;
            Operator = “”;
        } else if (command.equals(“=”)) {
            Num2 = Double.parseDouble(display.getText());

            Switch (operator) {
                Case “+”: result = num1 + num2; break;
                Case “-“: result = num1 – num2; break;
                Case “*”: result = num1 * num2; break;
                Case “/”:
                    If (num2 != 0) result = num1 / num2;
                    Else throw new ArithmeticException(“Cannot divide by zero.”);
                    Break;
                Case “^”: result = Math.pow(num1, num2); break;
                Case “%”:
                    If (num2 != 0) result = num1 % num2;
                    Else throw new ArithmeticException(“Modulo by zero is not allowed.”);
                    Break;
            }
            Display.setText(String.valueOf(result));
        } else if (command.equals(“√”)) {
            Num1 = Double.parseDouble(display.getText());
            If (num1 >= 0) {
                Result = Math.sqrt(num1);
                Display.setText(String.valueOf(result));
            } else {
                Display.setText(“Error: Negative Root”);
            }
        } else {
            Num1 = Double.parseDouble(display.getText());
            Operator = command;
            Display.setText(“”);
        }
    } catch (Exception ex) {
        Display.setText(“Error”);
    }
}

Public static void main(String[] args) {
    New GUICalculatorForAed4();
}

}