如何在Java中使用JRadio Buttons制作switch语句

Question

Beginner at Java here, kinda of confused here, so I know how to make switch statements and I know how to use JRadio buttons. Just having trouble putting it all together to do a switch statement using radio buttons. I do have the JRadio buttons that I want to use in a JRadio button group called payFrequency.

Update: example of code I am trying to use, so I know this below is incorrect, I would advise to provide and example of what I was trying to do.( payFrequency is the button group that the other radio button are in dont know if that information is relevant.)

           switch(PayFrequency)
               case jRadioButton1.isSelected():
                   sal1= (sal1a + sal1b) * 2.15;
                   break;
               case jRadioButton2.isSelected():
                   sal1= (sal1a + sal1b) * 4.3;
                   break;
               case jRadioButton3.isSelected():
                   sal1= (sal1a + sal1b) * 4.3;
                   break;                       
               default
                     sal1= sal1a + sal1b;  

Answer 1

JDK7+ supports switch with all primitives and String objects . So no you cannot use a radio button in a switch statement. But you can use myRadioButton.getText() in your switch which will return the text label of the radio button. Then you can take appropriate actions for each case inside your switch.

Answer 2

It's kinda tricky but you can set an "id" to JRadioButton with setActionCommand(String s) and then use them with switch case.

Check this code i modified from one random example ( Original Example ):

import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;
import javax.swing.SwingUtilities;


public class SwingJRadioButtonDemo extends JFrame {


private static final long serialVersionUID = -     8307105427074441939L;

    private JButton buttonOK = new JButton("OK");

    private JRadioButton optionLinux = new JRadioButton("Linux");
    private JRadioButton optionWin = new JRadioButton("Windows");
    private JRadioButton optionMac = new JRadioButton("Macintosh");



    public SwingJRadioButtonDemo() {
        super("Swing JRadioButton Demo");
        //Set ID and add to group
        ButtonGroup group = new ButtonGroup();
        optionLinux.setActionCommand ( "1" );
        group.add(optionLinux);
        optionWin.setActionCommand ( "2" );
        group.add(optionWin);
        optionMac.setActionCommand ( "3" );
        group.add(optionMac);



        optionWin.setSelected(true);


        setLayout(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.anchor = GridBagConstraints.CENTER;
        constraints.insets = new Insets(10, 10, 10, 10);

        add(optionLinux, constraints);
        constraints.gridx = 1;
        add(optionWin, constraints);
        constraints.gridx = 2;
        add(optionMac, constraints);

        constraints.gridx = 0;
        constraints.gridy = 1;
        constraints.gridwidth = 3;


        constraints.gridy = 2;
        add(buttonOK, constraints);

    RadioButtonActionListener actionListener = new     RadioButtonActionListener();
        optionLinux.addActionListener(actionListener);
        optionWin.addActionListener(actionListener);
        optionMac.addActionListener(actionListener);

        buttonOK.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent event) {
                //Get "ID"
            String selectedOption = group.getSelection (     ).getActionCommand ( );
                //Switch on "IDS"
                switch(selectedOption) {
                    case "1":
                    JOptionPane.showMessageDialog(    SwingJRadioButtonDemo.this,
                            "You selected: Linux with id: " +     selectedOption);
                        break;
                    case "2":
                    JOptionPane.showMessageDialog(    SwingJRadioButtonDemo.this,
                            "You selected: Windows with id: " +     selectedOption);
                        break;
                    case "3":
                    JOptionPane.showMessageDialog(    SwingJRadioButtonDemo.this,
                            "You selected Mac with id: " +     selectedOption);
                        break;
                }
            }

        });

        pack();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }

    class RadioButtonActionListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent event) {
            JRadioButton button = (JRadioButton) event.getSource();
            if (button == optionLinux) {

                System.out.println ( "Linux" );

            } else if (button == optionWin) {

                System.out.println ( "Windows" );

            } else if (button == optionMac) {

                System.out.println ( "Mac" );
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new SwingJRadioButtonDemo().setVisible(true);
            }
        });
    }
}