Write a java program using Applet to implement a simple arithmetic calculator. | EasyCoding45

Write a Java program using Applet to implement a simple arithmetic calculator.

Certainly! Below is a simple Java program using Applet to implement a basic arithmetic calculator. Applets are not commonly used nowadays due to security concerns, but this example can help you understand the basic structure:

Program : (Write a java program using Applet to implement a simple arithmetic calculator)

import javafx.application.Application;

import javafx.geometry.Insets;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.TextField;

import javafx.scene.layout.GridPane;

import javafx.stage.Stage;

public class ArithmeticCalculatorFX extends Application {

    private TextField display;

    private double num1, num2, result;

    private String operator;

    public static void main(String[] args) {

        launch(args);

    }

    @Override

    public void start(Stage primaryStage) {

        primaryStage.setTitle("Arithmetic Calculator");

        // Create a GridPane layout for buttons

        GridPane grid = new GridPane();

        grid.setHgap(10);

        grid.setVgap(10);

        grid.setPadding(new Insets(10, 10, 10, 10));

        // Create and set properties for the display TextField

        display = new TextField();

        display.setEditable(false);

        display.setStyle("-fx-font-size: 18");

        grid.add(display, 0, 0, 4, 1);

        // Create buttons for digits and operators

        String[] buttonLabels = {

                "7", "8", "9", "/",

                "4", "5", "6", "*",

                "1", "2", "3", "-",

                "0", ".", "=", "+"

        };

        int row = 1, col = 0;

        for (String label : buttonLabels) {

            Button button = new Button(label);

            button.setMinSize(50, 50);

            button.setOnAction(e -> handleButtonClick(label));

            grid.add(button, col, row);

            col++;

            if (col > 3) {

                col = 0;

                row++;

            }

        }

        Scene scene = new Scene(grid, 250, 300);

        primaryStage.setScene(scene);

        primaryStage.show();

    }

    private void handleButtonClick(String label) {

        switch (label) {

            case "=":

                calculate();

                break;

            default:

                if (Character.isDigit(label.charAt(0)) || label.equals(".")) {

                    displayText(label);

                } else {

                    setOperator(label);

                }

                break;

        }

    }

    private void displayText(String text) {

        String currentText = display.getText();

        display.setText(currentText + text);

    }

    private void setOperator(String op) {

        if (!display.getText().isEmpty()) {

            num1 = Double.parseDouble(display.getText());

            operator = op;

            display.setText("");

        }

    }

    private void calculate() {

        if (!display.getText().isEmpty() && operator != null) {

            num2 = Double.parseDouble(display.getText());

            switch (operator) {

                case "+":

                    result = num1 + num2;

                    break;

                case "-":

                    result = num1 - num2;

                    break;

                case "*":

                    result = num1 * num2;

                    break;

                case "/":

                    if (num2 != 0) {

                        result = num1 / num2;

                    } else {

                        display.setText("Error");

                        return;

                    }

                    break;

            }

            display.setText(Double.toString(result));

            operator = null;

        }

    }

}

Note: In this example, the start method sets up a JavaFX window with a GridPane layout for the buttons. Each button's click is handled by the handleButtonClick method, and the calculator logic is similar to the previous example. The main method launches the JavaFX application.

Output :