Create a JavaFX application that lets the user enter the food charge for a meal at a restaurant. When a button is clicked, the application should calculate and display the amount of an 18 percent tip on the total food charge, 7 percent sales tax, and the total of all three amounts. For example, if $20 is entered as a food charge for a meal then $3.6 should be displayed for the tip, $1.4 should be displayed for sales tax, and $25 should be displayed as a total of all three amounts.

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Explanation:

package sample;

import javafx.application.Application;

import javafx.fxml.FXMLLoader;

import javafx.geometry.*;

import javafx.scene.Parent;

import javafx.scene.Scene;

import javafx.scene.control.Label;

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.control.TextField;

import javafx.scene.layout.GridPane;

import javafx.stage.Stage;

public class Main extends Application {

atOverride // Replace the at with at symbol

public void start(Stage primaryStage) throws Exception{

primaryStage.setTitle("Calculator");

GridPane rootNode = new GridPane();

rootNode.setPadding(new Insets(15));

rootNode.setHgap(5);

rootNode.setVgap(5);

rootNode.setAlignment(Pos.CENTER);

Scene myScene = new Scene(rootNode, 300, 200);

rootNode.add(new Label("Amount:"), 0, 0);

TextField firstValue = new TextField();

rootNode.add(firstValue, 1, 0);

rootNode.add(new Label("Toatal is:"), 0, 5);

Button aButton = new Button("Calculate");

rootNode.add(aButton, 1, 2);

GridPane.setHalignment(aButton, HPos.LEFT);

TextField result = new TextField();

result.setEditable(false);

rootNode.add(result, 1, 5);

TextField tax = new TextField();

rootNode.add(new Label("Tax:"), 0, 3);

tax.setEditable(false);

rootNode.add(tax,1,3);

TextField tip = new TextField();

rootNode.add(new Label("Tip:"), 0, 4);

tip.setEditable(false);

rootNode.add(tip,1,4);

aButton.setOnAction(e -> {

Float value1 = Float.valueOf(firstValue.getText());

Float value2 =(value1*18)/100;

Float value3 = (value1*7)/100;

Float r = value1+value2+value3 ;

tax.setText(value3.toString());

tip.setText(value2.toString());

result.setText(r.toString());

});

primaryStage.setScene(myScene);

primaryStage.show();

}

public static void main(String[] args) {

launch(args);

}

}

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