JavaFx图形界面编写简单计算器功能

好的，下面是一个简单的JavaFx图形界面计算器的示例代码：

import javafx.application.Application;
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 Calculator extends Application {
    
    private TextField textField;
    private double num1 = 0, num2 = 0;
    private String operator = "";
    
    @Override
    public void start(Stage primaryStage) {
        // 创建布局
        GridPane gridPane = new GridPane();
        gridPane.setAlignment(Pos.CENTER);
        gridPane.setHgap(10);
        gridPane.setVgap(10);
        gridPane.setPadding(new Insets(25, 25, 25, 25));
        
        // 创建组件
        Label label = new Label("请输入两个数并选择操作符：");
        gridPane.add(label, 0, 0, 4, 1);
        
        textField = new TextField();
        gridPane.add(textField, 0, 1, 4, 1);
        
        Button btn1 = new Button("1");
        btn1.setOnAction(e -> textField.setText(textField.getText() + "1"));
        gridPane.add(btn1, 0, 2);
        
        Button btn2 = new Button("2");
        btn2.setOnAction(e -> textField.setText(textField.getText() + "2"));
        gridPane.add(btn2, 1, 2);
        
        Button btn3 = new Button("3");
        btn3.setOnAction(e -> textField.setText(textField.getText() + "3"));
        gridPane.add(btn3, 2, 2);
        
        Button btnPlus = new Button("+");
        btnPlus.setOnAction(e -> {
            num1 = Double.parseDouble(textField.getText());
            operator = "+";
            textField.setText("");
        });
        gridPane.add(btnPlus, 3, 2);
        
        Button btn4 = new Button("4");
        btn4.setOnAction(e -> textField.setText(textField.getText() + "4"));
        gridPane.add(btn4, 0, 3);
        
        Button btn5 = new Button("5");
        btn5.setOnAction(e -> textField.setText(textField.getText() + "5"));
        gridPane.add(btn5, 1, 3);
        
        Button btn6 = new Button("6");
        btn6.setOnAction(e -> textField.setText(textField.getText() + "6"));
        gridPane.add(btn6, 2, 3);
        
        Button btnMinus = new Button("-");
        btnMinus.setOnAction(e -> {
            num1 = Double.parseDouble(textField.getText());
            operator = "-";
            textField.setText("");
        });
        gridPane.add(btnMinus, 3, 3);
        
        Button btn7 = new Button("7");
        btn7.setOnAction(e -> textField.setText(textField.getText() + "7"));
        gridPane.add(btn7, 0, 4);
        
        Button btn8 = new Button("8");
        btn8.setOnAction(e -> textField.setText(textField.getText() + "8"));
        gridPane.add(btn8, 1, 4);
        
        Button btn9 = new Button("9");
        btn9.setOnAction(e -> textField.setText(textField.getText() + "9"));
        gridPane.add(btn9, 2, 4);
        
        Button btnMultiply = new Button("*");
        btnMultiply.setOnAction(e -> {
            num1 = Double.parseDouble(textField.getText());
            operator = "*";
            textField.setText("");
        });
        gridPane.add(btnMultiply, 3, 4);
        
        Button btn0 = new Button("0");
        btn0.setOnAction(e -> textField.setText(textField.getText() + "0"));
        gridPane.add(btn0, 0, 5);
        
        Button btnClear = new Button("C");
        btnClear.setOnAction(e -> textField.setText(""));
        gridPane.add(btnClear, 1, 5);
        
        Button btnEquals = new Button("=");
        btnEquals.setOnAction(e -> {
            num2 = Double.parseDouble(textField.getText());
            if (operator.equals("+")) {
                textField.setText(Double.toString(num1 + num2));
            } else if (operator.equals("-")) {
                textField.setText(Double.toString(num1 - num2));
            } else if (operator.equals("*")) {
                textField.setText(Double.toString(num1 * num2));
            } else if (operator.equals("/")) {
                textField.setText(Double.toString(num1 / num2));
            }
        });
        gridPane.add(btnEquals, 2, 5);
        
        Button btnDivide = new Button("/");
        btnDivide.setOnAction(e -> {
            num1 = Double.parseDouble(textField.getText());
            operator = "/";
            textField.setText("");
        });
        gridPane.add(btnDivide, 3, 5);
        
        // 创建场景
        Scene scene = new Scene(gridPane, 300, 250);
        
        // 设置窗口标题并显示场景
        primaryStage.setTitle("Calculator");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

这个计算器支持加、减、乘、除四种基本运算，还有清空和等于两个功能键。你可以根据自己的需求进行修改和扩展。