如何在属于按钮组的第二次单击时取消切换 jtogglebutton

Question

如何在第二次单击时取消切换属于 ButtonGroups 的 jtogglebuttons？我应该为此使用什么侦听器？谢谢！

JtoggleButton toggleButton;

toggleButton.addActionListener？ toggleButton.addChangeListener?

Answer 1

public class CustomButtonGroup extends ButtonGroup {
  @Override
  public void setSelected(ButtonModel model, boolean selected) {
    if (selected) {
      super.setSelected(model, selected);
    } else {
      clearSelection();
    }
  }
}

Answer 2

How to untoggle jtogglebuttons that belongs to ButtonGroups on second click? What listener should I use for this?

None，ButtonGroup会自动处理，这就是重点。 ButtonGroup 一次只允许在组中选择一个按钮。

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToggleButton;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

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

    public JavaApplication243() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            ButtonGroup bg = new ButtonGroup();
            JToggleButton btn1 = new JToggleButton("One");
            JToggleButton btn2 = new JToggleButton("Two");

            bg.add(btn1);
            bg.add(btn2);

            add(btn1);
            add(btn2);
        }

    }

}