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src/Calculate.java

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+import javafx.application.Application;
+import javafx.geometry.Insets;
+import javafx.geometry.Pos;
+import javafx.scene.Scene;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.layout.GridPane;
+import javafx.scene.layout.VBox;
+import javafx.stage.Stage;
+public class Calculate extends Application {
+    private Label display;
+    private double firstNumber = 0;
+    private String operator = "";
+    private boolean startNewNumber = true;
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+
+    @Override
+    public void start(Stage primaryStage) {
+        // Create display label
+        display = new Label("0.0");
+        display.setStyle("-fx-font-size: 30px;");
+        display.setMinWidth(200);  // Adjust width for display
+        display.setAlignment(Pos.CENTER_RIGHT);  // Align text to the right
+
+        // Set up the buttons
+        GridPane gridPane = createButtonGrid();
+
+        // Create the layout
+        VBox layout = new VBox(10);
+        layout.setPadding(new Insets(10));
+        layout.setAlignment(Pos.CENTER);
+        layout.getChildren().addAll(display, gridPane);
+
+        // Set up the scene and stage
+        Scene scene = new Scene(layout, 300, 400);
+        primaryStage.setTitle("Calculator");
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
+
+    private GridPane createButtonGrid() {
+        GridPane grid = new GridPane();
+        grid.setHgap(10);
+        grid.setVgap(10);
+        grid.setAlignment(Pos.CENTER);
+
+        // Create buttons with a similar layout to your screenshot
+        String[][] buttonText = {
+                {"AC", "±", "%", "÷"},
+                {"7", "8", "9", "×"},
+                {"4", "5", "6", "-"},
+                {"1", "2", "3", "+"},
+                {"0", ".", "=", ""}
+        };
+
+        // Set button size
+        int buttonSize = 50;
+
+        // Add buttons to the grid
+        int row = 0;
+        for (int i = 0; i < buttonText.length; i++) {
+            for (int j = 0; j < buttonText[i].length; j++) {
+                if (!buttonText[i][j].isEmpty()) {
+                    Button button = createButton(buttonText[i][j], buttonSize);
+                    if (buttonText[i][j].equals("0")) {
+                        grid.add(button, j, row, 2, 1); // Make '0' span two columns
+                    } else {
+                        grid.add(button, j, row);
+                    }
+                }
+            }
+            row++;
+        }
+
+        return grid;
+    }
+
+    private Button createButton(String text, int size) {
+        Button button = new Button(text);
+        button.setMinSize(size, size);
+        button.setStyle("-fx-font-size: 18px; -fx-background-color: white; -fx-border-color: lightgray;");
+        button.setOnAction(e -> handleButtonPress(text));
+        return button;
+    }
+
+    private void handleButtonPress(String text) {
+        if (text.matches("\\d") || text.equals(".")) {
+            handleNumberInput(text);
+        } else if (text.equals("AC")) {
+            handleClear();
+        } else if (text.equals("=")) {
+            handleEquals();
+        } else {
+            handleOperator(text);
+        }
+    }
+
+    private void handleNumberInput(String text) {
+        if (startNewNumber) {
+            display.setText(text);
+            startNewNumber = false;
+        } else {
+            display.setText(display.getText() + text);
+        }
+    }
+
+    private void handleClear() {
+        display.setText("0");
+        firstNumber = 0;
+        operator = "";
+        startNewNumber = true;
+    }
+
+    private void handleOperator(String text) {
+        firstNumber = Double.parseDouble(display.getText());
+        operator = text;
+        startNewNumber = true;
+    }
+
+    private void handleEquals() {
+        double secondNumber = Double.parseDouble(display.getText());
+        double result = 0;
+
+        switch (operator) {
+            case "+":
+                result = firstNumber + secondNumber;
+                break;
+            case "-":
+                result = firstNumber - secondNumber;
+                break;
+            case "×":
+                result = firstNumber * secondNumber;
+                break;
+            case "÷":
+                if (secondNumber != 0) {
+                    result = firstNumber / secondNumber;
+                } else {
+                    display.setText("Error");
+                    return;
+                }
+                break;
+            case "%":
+                result = firstNumber % secondNumber;
+                break;
+        }
+
+        display.setText(String.valueOf(result));
+        startNewNumber = true;
+    }
+}