javafx Calculator

 










package sample_calculator;


import javafx.application.Application;

import javafx.geometry.Insets;

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;


/**

 *

 * @author wajid

 */

public class Sample_Calculator extends Application {

    private StringBuilder inputBuffer = new StringBuilder();

    private String currentOperator = "";

    private double result = 0;


    private Label display;


    public static void main(String[] args) {

        launch(args);

    }


    @Override

    public void start(Stage primaryStage) {

        primaryStage.setTitle("Material java Calculator Demo");


        GridPane grid = new GridPane();

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

        grid.setHgap(5);

        grid.setVgap(5);


        display = new Label("0");

        display.setPrefSize(150, 30);


        Button[] digitButtons = new Button[10];

        for (int i = 0; i < 10; i++) {

            digitButtons[i] = new Button(Integer.toString(i));

            digitButtons[i].setPrefSize(50, 30);

            final int digit = i;

            digitButtons[i].setOnAction(event -> onDigitClick(digit));

        }


        Button addButton = createOperatorButton("+");

        Button subtractButton = createOperatorButton("-");

        Button multiplyButton = createOperatorButton("*");

        Button divideButton = createOperatorButton("/");

        Button equalsButton = new Button("=");

        equalsButton.setOnAction(event -> onEqualsClick());


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


        grid.addRow(1, digitButtons[7], digitButtons[8], digitButtons[9], addButton);

        grid.addRow(2, digitButtons[4], digitButtons[5], digitButtons[6], subtractButton);

        grid.addRow(3, digitButtons[1], digitButtons[2], digitButtons[3], multiplyButton);

        grid.addRow(4, digitButtons[0], equalsButton, divideButton);


        Scene scene = new Scene(grid, 210, 250);

        primaryStage.setScene(scene);

        primaryStage.show();

    }


    private Button createOperatorButton(String operator) {

        Button button = new Button(operator);

        button.setPrefSize(50, 30);

        button.setOnAction(event -> onOperatorClick(operator));

        return button;

    }


    private void onDigitClick(int digit) {

        inputBuffer.append(digit);

        updateDisplay();

    }


    private void onOperatorClick(String operator) {

        if (inputBuffer.length() > 0) {

            if (!currentOperator.isEmpty()) {

                onEqualsClick();

            }

            currentOperator = operator;

            result = Double.parseDouble(inputBuffer.toString());

            inputBuffer.setLength(0);

        }

    }


    private void onEqualsClick() {

        if (inputBuffer.length() > 0) {

            double operand = Double.parseDouble(inputBuffer.toString());

            switch (currentOperator) {

                case "+":

                    result += operand;

                    break;

                case "-":

                    result -= operand;

                    break;

                case "*":

                    result *= operand;

                    break;

                case "/":

                    if (operand != 0) {

                        result /= operand;

                    } else {

                        inputBuffer.setLength(0);

                        inputBuffer.append("Error");

                        updateDisplay();

                        return;

                    }

                    break;

            }

            inputBuffer.setLength(0);

            inputBuffer.append(result);

            currentOperator = "";

            updateDisplay();

        }

    }


    private void updateDisplay() {

        String displayText = inputBuffer.length() > 0 ? inputBuffer.toString() : Double.toString(result);

        displayText = displayText.length() > 10 ? displayText.substring(0, 10) : displayText;

        display.setText(displayText);

    }

}


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