Create calculator using java

calculator using java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class Calculator {
+    private JFrame frame;
+    private JTextField textField;
+    private JButton[] numberButtons = new JButton[10];
+    private JButton[] functionButtons = new JButton[8];
+    private JButton addButton, subButton, mulButton, divButton, eqButton, clrButton;
+    private JPanel panel;
+
+    private double num1, num2, result;
+    private char operator;
+
+    public Calculator() {
+        frame = new JFrame("Calculator");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setSize(300, 400);
+        frame.setLayout(null);
+
+        textField = new JTextField();
+        textField.setBounds(10, 10, 265, 30);
+        textField.setFont(new Font("Arial", Font.PLAIN, 20));
+        textField.setEditable(false);
+
+        addButton = new JButton("+");
+        subButton = new JButton("-");
+        mulButton = new JButton("*");
+        divButton = new JButton("/");
+        eqButton = new JButton("=");
+        clrButton = new JButton("C");
+
+        functionButtons[0] = addButton;
+        functionButtons[1] = subButton;
+        functionButtons[2] = mulButton;
+        functionButtons[3] = divButton;
+        functionButtons[4] = eqButton;
+        functionButtons[5] = clrButton;
+
+        for (int i = 0; i < 6; i++) {
+            functionButtons[i].setFont(new Font("Arial", Font.PLAIN, 18));
+            functionButtons[i].setBackground(Color.GRAY);
+            functionButtons[i].setFocusPainted(false);
+        }
+
+        for (int i = 0; i < 10; i++) {
+            numberButtons[i] = new JButton(String.valueOf(i));
+            numberButtons[i].setFont(new Font("Arial", Font.PLAIN, 18));
+            numberButtons[i].setBackground(Color.WHITE);
+            numberButtons[i].setFocusPainted(false);
+        }
+
+        clrButton.setBounds(10, 40, 50, 50);
+        divButton.setBounds(70, 40, 50, 50);
+        mulButton.setBounds(130, 40, 50, 50);
+        subButton.setBounds(190, 40, 50, 50);
+
+        panel = new JPanel();
+        panel.setBounds(10, 100, 265, 250);
+        panel.setLayout(new GridLayout(4, 4, 10, 10));
+        panel.setBackground(Color.GRAY);
+
+        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(numberButtons[0]);
+        panel.add(clrButton);
+        panel.add(eqButton);
+        panel.add(divButton);
+
+        frame.add(panel);
+        frame.add(clrButton);
+        frame.add(divButton);
+        frame.add(mulButton);
+        frame.add(subButton);
+        frame.add(addButton);
+        frame.add(eqButton);
+        frame.add(textField);
+        frame.setVisible(true);
+
+        for (int i = 0; i < 10; i++) {
+            final int finalI = i;
+            numberButtons[i].addActionListener(new ActionListener() {
+                public void actionPerformed(ActionEvent e) {
+                    textField.setText(textField.getText() + finalI);
+                }
+            });
+        }
+
+        addButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                num1 = Double.parseDouble(textField.getText());
+                operator = '+';
+                textField.setText("");
+            }
+        });
+
+        subButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                num1 = Double.parseDouble(textField.getText());
+                operator = '-';
+                textField.setText("");
+            }
+        });
+
+        mulButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                num1 = Double.parseDouble(textField.getText());
+                operator = '*';
+                textField.setText("");
+            }
+        });
+
+        divButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                num1 = Double.parseDouble(textField.getText());
+                operator = '/';
+                textField.setText("");
+            }
+        });
+
+        eqButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                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));
+            }
+        });
+
+        clrButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                textField.setText("");
+            }
+        });
+    }
+
+    public static void main(String[] args) {
+        new Calculator();
+    }
+}