GUI/Calculator.java at main · aboualine/GUI · GitHub

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

public class Calculator extends JFrame implements ActionListener {
    private JTextField textField;
    private JButton[] numberButtons = new JButton[10];
    private JButton[] functionButtons = new JButton[8];
    private JButton addButton, subButton, mulButton, divButton;
    private JButton decButton, equButton, delButton, clrButton;
    private JPanel panel;
    private double num1 = 0, num2 = 0, result = 0;
    private char operator;

    public Calculator() {
        setTitle("Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 550);
        setLayout(null);
        textField = new JTextField();
        textField.setBounds(50, 25, 300, 50);
        textField.setFont(new Font("Arial", Font.BOLD, 24));
        textField.setEditable(false);
        add(textField);
        addButton = new JButton("+");
        subButton = new JButton("-");
        mulButton = new JButton("*");
        divButton = new JButton("/");
        decButton = new JButton(".");
        equButton = new JButton("=");
        delButton = new JButton("Del");
        clrButton = new JButton("Clear");
        functionButtons[0] = addButton;
        functionButtons[1] = subButton;
        functionButtons[2] = mulButton;
        functionButtons[3] = divButton;
        functionButtons[4] = decButton;
        functionButtons[5] = equButton;
        functionButtons[6] = delButton;
        functionButtons[7] = clrButton;
        for (JButton button : functionButtons) {
            button.addActionListener(this);
            button.setFont(new Font("Arial", Font.BOLD, 20));
            button.setFocusable(false);
        }
        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton(String.valueOf(i));
            numberButtons[i].addActionListener(this);
            numberButtons[i].setFont(new Font("Arial", Font.BOLD, 20));
            numberButtons[i].setFocusable(false);
        }
        panel = new JPanel();
        panel.setBounds(50, 100, 300, 300);
        panel.setLayout(new GridLayout(4, 4, 10, 10));
        panel.add(numberButtons[1]);
        panel.add(numberButtons[2]);
        panel.add(numberButtons[3]);
        panel.add(addButton);
        panel.add(numberButtons[4]);
        panel.add(numberButtons[5]);
        panel.add(numberButtons[6]);
        panel.add(subButton);
        panel.add(numberButtons[7]);
        panel.add(numberButtons[8]);
        panel.add(numberButtons[9]);
        panel.add(mulButton);
        panel.add(decButton);
        panel.add(numberButtons[0]);
        panel.add(equButton);
        panel.add(divButton);
        add(panel);
        delButton.setBounds(50, 420, 145, 50);
        clrButton.setBounds(205, 420, 145, 50);
        add(delButton);
        add(clrButton);
        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() == decButton) {
            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() == equButton) {
            num2 = Double.parseDouble(textField.getText());
            switch (operator) {
                case '+': result = num1 + num2; break;
                case '-': result = num1 - num2; break;
                case '*': result = num1 * num2; break;
                case '/': result = num1 / num2; break;
            }
            textField.setText(String.valueOf(result));
            num1 = result;
        }
        if (e.getSource() == clrButton) {
            textField.setText("");
        }
        if (e.getSource() == delButton) {
            String str = textField.getText();
            textField.setText(str.substring(0, str.length() - 1));
        }
    }
    public static void main(String[] args) {
        new Calculator();
    }
}