javafx開發計算器

package com.gaze.notcalculator.mainwindows;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TextField;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.*;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.stage.Stage;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class MainWindows extends Application {
    TextField display;
    @Override
    public void start(Stage stage) throws Exception {
        stage.setTitle("  計算器");
        stage.getIcons().add(new Image(getClass().getResource("/image/jsq.png").toExternalForm()));
        stage.setResizable(false);
        //主容器
        BorderPane borderPane = new BorderPane();
        //上部區域容器
        HBox hBox = new HBox();
        VBox vBox = new VBox();
        BorderPane borderPane2 =  new BorderPane();
        hBox.getChildren().add(borderPane2);
        ImageView imageView = new ImageView(new Image(getClass().getResource("/image/gn.png").toExternalForm()));
        imageView.setFitWidth(20);
        imageView.setFitHeight(20);
        borderPane2.setPadding(new Insets(100,10,0,10));
        //新增螢幕
        display= new TextField("0");
        display.setFont(new Font("Arial", 36));
        display.setStyle("-fx-background-color:#f19123;");
        display.setAlignment(Pos.CENTER_RIGHT);
        display.setEditable(false);
        display.setPrefHeight(100);
        VBox.setMargin(imageView, new Insets(-80, 15, 0, 0));
        imageView.setOnMousePressed(e -> imageView.setStyle("-fx-background-radius: 10;  -fx-background-color:#f4f7f9; -fx-scale-x: 0.95; -fx-scale-y: 0.95;"));
        imageView.setOnMouseReleased(e -> imageView.setStyle("-fx-background-radius: 10;  -fx-background-color: #ffffff; -fx-scale-x: 1; -fx-scale-y: 1;"));
         //設定選單
        ContextMenu contextMenu = new ContextMenu();
        //新增選單項
        MenuItem historyItem = new MenuItem("歷史記錄");
        MenuItem pwdItem = new MenuItem("設定密碼");
        contextMenu.getItems().addAll(historyItem, pwdItem);
        //設定點選按鈕
        imageView.setOnMouseClicked(e -> contextMenu.show(imageView, e.getScreenX(), e.getScreenY()));
        borderPane2.setBottom(display);
        borderPane2.setRight(vBox);
        vBox.getChildren().add(imageView);
//        中心區域容器
        GridPane gridPane = new GridPane();
        gridPane.setPadding(new Insets(0, 0,0,0));
//        gridPane.prefWidth(390);
//        gridPane.prefHeight(360);
        // 建立按鈕
        String[] buttonsText = {
                "AC", "%","⌫","÷",
                "7", "8", "9", "×",
                "4", "5", "6", "-",
                "1", "2", "3", "+",
                "00", "0", ".","="
        };     // 配置列和行的大小
        // 新增按鈕到 GridPane
        int index = 0;
        for (int row = 0; row < 5; row++) {
            for (int col = 0; col < 4; col++) {
                if (index < buttonsText.length) {
                    Button button = new Button(buttonsText[index]);
                    button.setFont(new Font("Arial", 18));
                    button.setPrefSize(90, 70);
                    button.setStyle("-fx-background-radius: 10;-fx-background-color: #ffffff");
                    //滑鼠進入、退出
                    button.setOnMouseEntered(e -> button.setStyle("-fx-background-color: #f4f7f9"));
                    button.setOnMouseExited(e -> button.setStyle("-fx-background-color: #ffffff"));
                    button.setOnMousePressed(e -> button.setStyle("-fx-background-radius: 10;  -fx-background-color:#f4f7f9; -fx-scale-x: 0.95; -fx-scale-y: 0.95;"));
                    button.setOnMouseReleased(e -> button.setStyle("-fx-background-radius: 10;  -fx-background-color: #ffffff; -fx-scale-x: 1; -fx-scale-y: 1;"));
//                    button.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
                    button.setOnAction(e -> handleButtonAction(button.getText()));
                    index++;
                    gridPane.add(button, col, row);
                }
            }
        }
        gridPane.setHgap(5);
        gridPane.setVgap(5);
        gridPane.setAlignment(Pos.CENTER);
        for (int i = 0; i < 4; i++) {
            ColumnConstraints column = new ColumnConstraints(90); // 每列寬度為80
            gridPane.getColumnConstraints().add(column);
        }
        for (int i = 0; i < 5; i++) {
            RowConstraints row = new RowConstraints(40); // 每行高度為80
            gridPane.getRowConstraints().add(row);
        }
        gridPane.setStyle("-fx-background-color: #eff4f9;");
        borderPane.setTop(hBox);
        borderPane.setCenter(gridPane);
        Scene scene = new Scene(borderPane,400,500);
        stage.setScene(scene);
        stage.show();
    }
    private void handleButtonAction(String buttonText) {
        String currentText = display.getText();
        System.out.println(buttonText);
        switch (buttonText) {
            case "AC":
                display.setText("0");
                break;
            case "⌫":
                if (currentText.length() > 1) {
                    display.setText(currentText.substring(0, currentText.length() - 1));
                } else {
                    display.setText("0");
                }
                break;
            case "=":
              try {
                  if (currentText.contains("×")){
                      // 查詢運算子的位置
                      int operatorIndex = currentText.indexOf("×");
                      // 如果找到運算子
                      if (operatorIndex != -1) {
                          // 擷取運算子前面的部分
                          String beforeOperator = currentText.substring(0, operatorIndex);
                          // 擷取運算子後面的部分
                          String afterOperator = currentText.substring(operatorIndex + 1);
                          Double result = Double.parseDouble(beforeOperator) * Double.parseDouble(afterOperator);
                          System.out.println(result);
                          display.setText(String.valueOf(result));
                      } else {
                          display.setText("輸入不合符！");
                      }
                  } else if (currentText.contains("÷")){
                      // 查詢運算子的位置
                      int operatorIndex = currentText.indexOf("÷");
                      // 如果找到運算子
                      if (operatorIndex != -1) {
                          // 擷取運算子前面的部分
                          String beforeOperator = currentText.substring(0, operatorIndex);
                          // 擷取運算子後面的部分
                          String afterOperator = currentText.substring(operatorIndex + 1);
                          Double result = Double.parseDouble(beforeOperator) / Double.parseDouble(afterOperator);
                          System.out.println(result);
                          display.setText(String.valueOf(result));
                      } else {
                          display.setText("輸入不合符！");
                      }
                  }else if (currentText.contains("+")){
                      // 查詢運算子的位置
                      int operatorIndex = currentText.indexOf("+");
                      // 如果找到運算子
                      if (operatorIndex != -1) {
                          // 擷取運算子前面的部分
                          String beforeOperator = currentText.substring(0, operatorIndex);
                          // 擷取運算子後面的部分
                          String afterOperator = currentText.substring(operatorIndex + 1);
                          Double result = Double.parseDouble(beforeOperator) + Double.parseDouble(afterOperator);
                          System.out.println(result);
                          display.setText(String.valueOf(result));
                      } else {
                          display.setText("輸入不合符！");
                      }
                  }else if (currentText.contains("-")){
                      // 查詢運算子的位置
                      int operatorIndex = currentText.indexOf("-");
                      // 如果找到運算子
                      if (operatorIndex != -1) {
                          // 擷取運算子前面的部分
                          String beforeOperator = currentText.substring(0, operatorIndex);
                          // 擷取運算子後面的部分
                          String afterOperator = currentText.substring(operatorIndex + 1);
                          Double result = Double.parseDouble(beforeOperator) - Double.parseDouble(afterOperator);
                          System.out.println(result);
                          display.setText(String.valueOf(result));
                      } else {
                          display.setText("輸入不合符！");
                      }
                  }else if (currentText.contains("%")){
                      // 查詢運算子的位置
                      int operatorIndex = currentText.indexOf("%");
                      // 如果找到運算子
                      if (operatorIndex != -1) {
                          // 擷取運算子前面的部分
                          String beforeOperator = currentText.substring(0, operatorIndex);
                          // 擷取運算子後面的部分
                          System.out.println(beforeOperator);
                          String afterOperator = currentText.substring(operatorIndex + 1);
                          System.out.println(afterOperator);
                          if (afterOperator.equals("")){
                             Double result = Double.parseDouble(beforeOperator) / 100;
                             display.setText(String.valueOf(result));
                          }else {
                              Double result = Double.parseDouble(beforeOperator) / 100 * Double.parseDouble(afterOperator);
                              display.setText(String.valueOf(result));
                          }

                      } else {
                          display.setText("輸入不合符！");
                      }
                  }
              } catch (Exception e){
                  display.setText("輸入不合符！");
              }

                break;
            default:
                if (currentText.equals("0")) {
                    display.setText(buttonText);
                } else {
                    display.setText(currentText + buttonText);
                }
                break;
        }
    }

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