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SimpleCalculator.java

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+import javax.swing.*;
+import java.awt.*;
+
+
+public class SimpleCalculator extends JFrame {
+
+    private JTextField display;
+    private JPanel panel;
+    private double operand1 = 0;
+    private double operand2 = 0;
+    private char operator;
+    private boolean userIsTypingSecondNumber = false;
+
+    public SimpleCalculator() {
+        setTitle("Simple Calculator");
+        setSize(400, 500);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLocationRelativeTo(null);
+
+        // Display text field
+        display = new JTextField();
+        display.setEditable(false);
+        display.setHorizontalAlignment(SwingConstants.RIGHT);
+        add(display, BorderLayout.NORTH);
+
+        // Panel for buttons
+        panel = new JPanel();
+        panel.setLayout(new GridLayout(5, 4, 10, 10));
+
+        // Add numbers and operations to panel
+        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("Verdana", Font.PLAIN, 24));
+            button.setFocusable(false);
+            panel.add(button);
+            button.addActionListener(new ButtonClickListener());
+        }
+
+        add(panel, BorderLayout.CENTER);
+    }