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Calculator.java

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+package java6324.lesson06;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class Calculator extends JFrame {
+    private JTextField input1, input2, result;
+    private JButton addButton, subtractButton, multiplyButton, divideButton, modButton;
+    private JPanel panel;
+
+    public Calculator() {
+        setTitle("Simple Calculator");
+        setSize(300, 200);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLayout(new GridLayout(5, 4, 5, 5));
+        panel = new JPanel();
+        panel.setLayout(new GridLayout(5, 4, 5, 5));
+
+        input1 = new JTextField(5);
+        input2 = new JTextField(5);
+        result = new JTextField(5);
+        result.setEditable(false);
+
+        addButton = new JButton("+");
+        subtractButton = new JButton("-");
+        multiplyButton = new JButton("*");
+        divideButton = new JButton("/");
+        modButton = new JButton("%");
+
+        addButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                calculate(1);
+            }
+        });
+
+        subtractButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                calculate(2);
+            }
+        });
+
+        multiplyButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                calculate(3);
+            }
+        });
+
+        divideButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                calculate(4);
+            }
+        });
+
+        modButton.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                calculate(5);
+            }
+        });
+
+        panel.add(new JLabel("Input 1:"));
+        panel.add(input1);
+        panel.add(new JLabel("Input 2:"));
+        panel.add(input2);
+        panel.add(addButton);
+        panel.add(subtractButton);
+        panel.add(multiplyButton);
+        panel.add(divideButton);
+        panel.add(modButton);
+        panel.add(new JLabel());
+        panel.add(result);
+
+        add(panel);
+        setVisible(true);
+    }
+
+    private void calculate(int operation) {
+        try {
+            double num1 = Double.parseDouble(input1.getText());
+            double num2 = Double.parseDouble(input2.getText());
+            double res = 0;
+
+            switch (operation) {
+                case 1:
+                    res = num1 + num2;
+                    break;
+                case 2:
+                    res = num1 - num2;
+                    break;
+                case 3:
+                    res = num1 * num2;
+                    break;
+                case 4:
+                    if (num2 != 0) {
+                        res = num1 / num2;
+                    } else {
+                        result.setText("Error");
+                        return;
+                    }
+                    break;
+                case 5:
+                    if (num2 != 0) {
+                        res = num1 % num2;
+                    } else {
+                        result.setText("Error");
+                        return;
+                    }
+                    break;
+            }
+            result.setText(String.valueOf(res));
+        } catch (NumberFormatException e) {
+            result.setText("Invalid Input");
+        }
+    }
+
+    public static void main(String[] args) {
+        new Calculator();
+    }
+}