根據4個JRadioButton的組合執行操作

Question

我有一個簡單的應用程序來設計。 兩個文本字段（每個字段用於一個操作數），一個計算按鈕（用於計算應用於這兩個操作數和4個單選按鈕的操作的值），分為兩個按鈕組：第一組包含按鈕A和B，第二組包含按鈕C和D

我需要對這4個按鈕組合執行某種操作（例如加法）。（A + C =>操作<-加法）每組中只有一個按鈕處於活動狀態。 我必須避免使用IF語句。

這就是我現在所擁有的。 我必須向addListeners()函數添加新代碼。

package calculator;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Calculator {
    private JFrame frame;
    private JPanel mainPanel;
    private JTextField firstField;
    private JTextField secondField;
    private JButton computeButton;
    private JTextField resultField;
    private JRadioButton aRadioButton;
    private JRadioButton bRadioButton;
    private JRadioButton cRadioButton;
    private JRadioButton dRadioButton;
    private ButtonGroup firstRadioButtonGroup;
    private ButtonGroup secondRadioButtonGroup;
    private IOperation operation;
    private double firstOperand;
    private double secondOperand;
    private double result;

    public Calculator() {
        initialize();
        adjustWindow();
        applyStyle();
        centerWindow();
        addToFrame();
        addListeners();


    }

    private void addListeners() {

        computeButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                firstOperand = Double.parseDouble(firstField.getText());
                secondOperand = Double.parseDouble(secondField.getText());
                result = operation.compute(firstOperand, secondOperand);
                resultField.setText(Double.toString(result));
            }
        });

    }

    private void addToFrame() {
        mainPanel.add(firstField);
        mainPanel.add(secondField);
        mainPanel.add(computeButton);
        mainPanel.add(aRadioButton);
        mainPanel.add(bRadioButton);
        mainPanel.add(cRadioButton);
        mainPanel.add(dRadioButton);        firstRadioButtonGroup.add(aRadioButton);
        firstRadioButtonGroup.add(bRadioButton);
        secondRadioButtonGroup.add(cRadioButton);
        secondRadioButtonGroup.add(dRadioButton);
        mainPanel.add(aRadioButton);
        mainPanel.add(bRadioButton);
        mainPanel.add(cRadioButton);
        mainPanel.add(dRadioButton);
        firstRadioButtonGroup.clearSelection();
        mainPanel.add(resultField);
        frame.add(mainPanel);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    private void initialize() {
        firstOperand = 0;
        secondOperand = 0;
        frame = new JFrame("Calculator");
        mainPanel = new JPanel();
        firstField = new JTextField();
        secondField = new JTextField();
        computeButton = new JButton("Compute");
        resultField = new JTextField();
        aRadioButton = new JRadioButton("A");
        bRadioButton = new JRadioButton("B");
        cRadioButton = new JRadioButton("C");
        dRadioButton = new JRadioButton("D");
        firstRadioButtonGroup = new ButtonGroup();
        secondRadioButtonGroup = new ButtonGroup();
    }

    private void adjustWindow() {
        frame.setSize(300, 300);
    }

    private void centerWindow() {
        Toolkit tool = Toolkit.getDefaultToolkit();
        Dimension screenSize = tool.getScreenSize();

        double screenHeight = screenSize.height;
        double screenWidth = screenSize.width;

        double currentWindowHeight = frame.getHeight();
        double currentWindowWidth = frame.getWidth();

        int windowHeight = (int) ((screenHeight / 2) - (currentWindowHeight / 2));
        int windowWidth = (int) ((screenWidth / 2) - (currentWindowWidth / 2));

        frame.setLocation(windowWidth, windowHeight);
    }

    private void applyStyle() {
        firstField.setPreferredSize(new Dimension(240, 30));
        secondField.setPreferredSize(new Dimension(240, 30));
        resultField.setPreferredSize(new Dimension(240, 30));
        computeButton.setPreferredSize(new Dimension(240, 30));
    }
}

我想了解更多有關該設計的信息。 是否可以將計算器的GUI與操作分開？

Answer 1

您可以創建一個映射，其中的鍵是可能的按鈕文本組合，值是各自的操作

IOperation addition = ...
Map<String, IOperation> operations = ...;
operations.put("AC", addition);

在偵聽器中，您可以檢查選中了哪些按鈕並連接其文本。

String operationKey = selectedButton1Text + selectedButton2Text;

有關如何獲取單選按鈕文本的信息，請參見此答案 。 然后執行操作：

operations.get(operationKey).compute(...)

Answer 2

我已經找到了解決方法。 我設置了一個狀態機，默認情況下從添加開始，並在有單選按鈕更新時進入下一個狀態。 這是git repo的鏈接： 代碼