javafx problem.

Modify the app by changing the interface (similar to the one on iphones). You may change colors and fonts

and then Add more functions for the calculator, e.g., 1/x (which is reciprocal of x),x^2 ,

import javafx.application.Application; import javafx.beans.binding.Bindings; import javafx.beans.property.DoubleProperty; import javafx.beans.property.SimpleDoubleProperty; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.TextField; import javafx.scene.layout.TilePane; import javafx.scene.layout.VBox; import javafx.scene.text.Font; import javafx.stage.Stage; import javafx.stage.StageStyle;

/* This is the GUI class that visualize the calculator * * */ public class Calculator extends Application { private MyStack stack = new MyStack(); private double font_size = 30; //by default the font size on the screen is 30 /*The keyboard key values*/ private static final String[][] key_values = { { "0", "=", "c", "

public static void main(String[] args) { launch(args); }

@Override public void start(Stage stage) { /*The outside layout*/ final VBox layout = new VBox(30); //the size vertically

/*The inside layout for keys or buttons*/ TilePane keypad = new TilePane(); //even it is called keypad, it is a layout keypad.setVgap(7); keypad.setHgap(7); //set the gap between keys /*Create Calculator Screen */ calculator_screen = new TextField(); calculator_screen.getStyleClass().add("screen1"); //set the style of the screen calculator_screen.setAlignment(Pos.CENTER_RIGHT); //make the screen in the center of the calculator calculator_screen.setEditable(false); //make sure the screen cannot be typed in manually calculator_screen.setPrefWidth(300); //set the windth of the screen calculator_screen.setPrefHeight(30); calculator_screen.setFont(Font.font("Verdana", font_size)); /*Create Calculator keyboard*/ keypad.setPrefColumns(key_values[0].length); //set the preferred number of columns

for (int i = 0; i (){

@Override public void handle(ActionEvent event) { StackNode node = new StackNode(key_values[a][b]); if(a == 0 && b == 2) //if the key is "c" { stack.clear(); calculator_screen.setFont(Font.font("Verdana", 30)); font_size = 30; } else if(a == 0 && b == 3) //if the key is "b" stack.pop(); else if (a == 0 && b == 1) // if the key is "=" { stack.computeExp(); } else stack.push(node); //otherwise push the key into the list String math_exp = stack.getAllNodeValues(); if(math_exp.length() * font_size > 1.2 * calculator_screen.getPrefWidth()) { font_size /= 1.2; calculator_screen.setFont(Font.font("Verdana", font_size)); } calculator_screen.setText(math_exp); } } ); //Add special style for the "=" button if(a == 0 && b == 1) btn[i][j].getStyleClass().add("btnEqual"); else if(a == 0 && b == 2) btn[i][j].getStyleClass().add("btnClear"); else if(a == 0 && b == 3) btn[i][j].getStyleClass().add("btnBackspace"); keypad.getChildren().add(btn[i][j]); } } /*Put the calculator screen and keypad into a VBox layout*/ layout.setAlignment(Pos.CENTER); layout.getChildren().addAll(calculator_screen, keypad); layout.getStyleClass().add("vbox1"); calculator_screen.prefWidthProperty().bind(keypad.widthProperty()); /*Show the window*/ stage.setTitle("Calculator"); stage.initStyle(StageStyle.UTILITY); stage.setResizable(false); Scene scene = new Scene(layout); scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm()); stage.setScene(scene); stage.show(); }

Calculator O -160 XL + 1 789 + Calculator O -160 XL + 1 789 +