import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class CalculatorGUI extends JFrame implements ActionListener {
// GUI components
private JTextField textField;
private JButton[] numberButtons;
private JButton[] functionButtons;
private JButton addButton, subButton, mulButton, divButton;
private JButton clrButton, eqlButton, dotButton;
// Variables
private double num1, num2, result;
private char operator;
public CalculatorGUI() {
// Frame setup
setTitle("Calculator");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(400, 500);
setLocationRelativeTo(null);
setLayout(new GridLayout(5, 4));
// Text field
textField = new JTextField();
textField.setFont(new Font("Arial", Font.PLAIN, 30));
textField.setHorizontalAlignment(JTextField.RIGHT);
add(textField);
// Number buttons
numberButtons = new JButton[10];
for (int i = 0; i < 10; i++) {
numberButtons[i] = new JButton(String.valueOf(i));
numberButtons[i].setFont(new Font("Arial", Font.PLAIN, 20));
numberButtons[i].addActionListener(this);
add(numberButtons[i]);
}
// Function buttons
addButton = new JButton("+");
subButton = new JButton("-");
mulButton = new JButton("*");
divButton = new JButton("/");
clrButton = new JButton("C");
eqlButton = new JButton("=");
dotButton = new JButton(".");
functionButtons = new JButton[]{addButton, subButton, mulButton, divButton, clrButton, eqlButton, dotButton};
for (JButton button : functionButtons) {
button.setFont(new Font("Arial", Font.PLAIN, 20));
button.addActionListener(this);
add(button);
}
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < 10; i++) {
if (e.getSource() == numberButtons[i]) {
textField.setText(textField.getText() + i);
}
}
if (e.getSource() == dotButton) {
if (!textField.getText().contains(".")) {
textField.setText(textField.getText() + ".");
}
}
if (e.getSource() == addButton) {
num1 = Double.parseDouble(textField.getText());
operator = '+';
textField.setText("");
}
if (e.getSource() == subButton) {
num1 = Double.parseDouble(textField.getText());
operator = '-';
textField.setText("");
}
if (e.getSource() == mulButton) {
num1 = Double.parseDouble(textField.getText());
operator = '*';
textField.setText("");
}
if (e.getSource() == divButton) {
num1 = Double.parseDouble(textField.getText());
operator = '/';
textField.setText("");
}
if (e.getSource() == eqlButton) {
num2 = Double.parseDouble(textField.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 {
textField.setText("Error");
return;
}
break;
}
textField.setText(String.valueOf(result));
num1 = result;
}
if (e.getSource() == clrButton) {
textField.setText("");
num1 = num2 = result = 0;
}
}
public static void main(String[] args) {
new CalculatorGUI();
}
}
