Upload files to "OOP/Java/Lab/Week13"

2024-10-26 02:15:11 +05:30 · 2024-10-26 02:15:11 +05:30 · 8fbdd81a2b
commit 8fbdd81a2b
parent 0909e7c1ae
5 changed files with 402 additions and 0 deletions
--- a/OOP/Java/Lab/Week13/Calculator.java
+++ b/OOP/Java/Lab/Week13/Calculator.java
@ -0,0 +1,122 @@
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+public class Calculator extends JFrame implements ActionListener {
+
+    private JTextField display;
+    private double result = 0;
+    private String operator = "=";
+    private boolean calculating = true;
+
+    public Calculator() {
+        display = new JTextField("0", 20);
+        display.setHorizontalAlignment(JTextField.RIGHT);
+        display.setEditable(false);
+
+        // Create panel with grid layout for buttons
+        JPanel buttonPanel = new JPanel();
+        buttonPanel.setLayout(new GridLayout(4, 4, 5, 5));
+
+        String[] buttonLabels = {
+            "7",
+            "8",
+            "9",
+            "/",
+            "4",
+            "5",
+            "6",
+            "*",
+            "1",
+            "2",
+            "3",
+            "-",
+            "0",
+            ".",
+            "=",
+            "+",
+        };
+
+        for (String label : buttonLabels) {
+            JButton button = new JButton(label);
+            buttonPanel.add(button);
+            button.addActionListener(this);
+        }
+
+        JButton clearButton = new JButton("C");
+        clearButton.addActionListener(e -> {
+            result = 0;
+            operator = "=";
+            calculating = true;
+            display.setText("0");
+        });
+
+        // Layout
+        setLayout(new BorderLayout(5, 5));
+        add(display, BorderLayout.NORTH);
+        add(buttonPanel, BorderLayout.CENTER);
+        add(clearButton, BorderLayout.SOUTH);
+
+        setTitle("Simple Calculator");
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        pack();
+        setLocationRelativeTo(null);
+    }
+
+    public void actionPerformed(ActionEvent event) {
+        String command = event.getActionCommand();
+
+        if (
+            (command.charAt(0) >= '0' && command.charAt(0) <= '9') ||
+            command.equals(".")
+        ) {
+            if (calculating) {
+                display.setText(command);
+            } else {
+                display.setText(display.getText() + command);
+            }
+            calculating = false;
+        } else {
+            if (calculating) {
+                if (command.equals("-")) {
+                    display.setText(command);
+                    calculating = false;
+                } else {
+                    operator = command;
+                }
+            } else {
+                double x = Double.parseDouble(display.getText());
+                calculate(x);
+                operator = command;
+                calculating = true;
+            }
+        }
+    }
+
+    private void calculate(double n) {
+        switch (operator) {
+            case "+":
+                result += n;
+                break;
+            case "-":
+                result -= n;
+                break;
+            case "*":
+                result *= n;
+                break;
+            case "/":
+                result /= n;
+                break;
+            case "=":
+                result = n;
+                break;
+        }
+        display.setText("" + result);
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            new Calculator().setVisible(true);
+        });
+    }
+}