Question

我想取消选择我在JFrame中的程序中的单选按钮，它有一些方法可以通过一个名为Clean的按钮来取消选择所有单选按钮吗？此按钮将清除辐射按钮和具有的文本。

行动的代码将使所有人认为干净：

JButton btnClean = new JButton("Clean");
        btnClean.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {


            }
        });
        btnClean.setBounds(208, 184, 126, 28);
        contentPane.add(btnClean);

Answer 1

通常，JRadioButtons在ButtonGroup对象中组合在一起，这是一个逻辑对象，一次只能选择一个JRadioButton。你想要做的是在这个ButtonGroup对象上调用clearSelection()。

另外，您希望在GUI中使用null布局。虽然null布局和setBounds()似乎是Swing新手，比如创建复杂GUI的最简单和最好的方法，但是你创建的Swing GUI越多，你在使用它们时会遇到更严重的困难。。当GUI调整大小时，他们不会调整组件的大小，他们是增强或维护的皇室女巫，当他们放置在滚动窗格中时，他们完全失败，当他们在所有平台或屏幕分辨率不同时看起来很糟糕原来的。

例如

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import javax.swing.*;

@SuppressWarnings("serial")
public class BunchOButtons extends JPanel {
    private static final String[] RADIO_TEXTS = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday"};
    private ButtonGroup weekDayBtnGroup = new ButtonGroup();

    public BunchOButtons() {
        // JRadioButtons love being held in JPanels that use GridLayout
        JPanel radioPanel = new JPanel(new GridLayout(1, 0));
        radioPanel.setBorder(BorderFactory.createTitledBorder("Week Days"));
        for (String radioText : RADIO_TEXTS) {
            JRadioButton radioButton = new JRadioButton(radioText); // create radiobtn
            radioButton.setActionCommand(radioText); // set its action command text
            weekDayBtnGroup.add(radioButton); // add to ButtonGroup
            radioPanel.add(radioButton);   // add to a GridLayout-using JPanel
        }

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(new JButton(new AbstractAction("Show Selection") {

            @Override
            public void actionPerformed(ActionEvent evt) {
                ButtonModel model = weekDayBtnGroup.getSelection();
                if (model != null) {
                    // if something is selected
                    System.out.println(model.getActionCommand());
                } else {
                    System.out.println("No weekday selected");
                }
            }
        }));
        buttonPanel.add(new JButton(new AbstractAction("Clear Selection") {

            @Override
            public void actionPerformed(ActionEvent e) {
                weekDayBtnGroup.clearSelection();
            }
        }));

        setLayout(new BorderLayout());
        add(radioPanel, BorderLayout.CENTER);
        add(buttonPanel, BorderLayout.PAGE_END);
    }

    private static void createAndShowGui() {
        BunchOButtons mainPanel = new BunchOButtons();

        JFrame frame = new JFrame("BunchOButtons");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.getContentPane().add(mainPanel);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

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

Answer 2

由于您的JFrame可能包含任意嵌套在框架布局中的许多JRadioButton个组件，您可能需要使用Container.getComponents递减组件层次结构，并检查每个组件是否为instanceof { {1}}，在这种情况下你应该强制转换JRadioButton或.setSelected(false)，在这种情况下你应该继续递归。要获取Container的顶级容器，请使用JFrame。

用一个简单的例子来说明这种方法（包含OP请求的JFrame.getContentPane方法的实现）：

Clean

当然，正如其他人所建议的那样，您很可能想要将单选按钮的选择状态管理分配给public class FrameWithRadios extends JFrame { public FrameWithRadios() { setDefaultCloseOperation(EXIT_ON_CLOSE); JPanel panelCenter = new JPanel(); panelCenter.setLayout(new GridLayout(1, 2)); JRadioButton rb11 = new JRadioButton("Option 1.1"); JRadioButton rb12 = new JRadioButton("Option 1.2"); JRadioButton rb13 = new JRadioButton("Option 1.3"); JPanel panelLeft = new JPanel(); panelLeft.setLayout(new GridLayout(3, 1)); panelLeft.add(rb11); panelLeft.add(rb12); panelLeft.add(rb13); panelCenter.add(panelLeft); JRadioButton rb21 = new JRadioButton("Option 2.1"); JRadioButton rb22 = new JRadioButton("Option 2.2"); JRadioButton rb23 = new JRadioButton("Option 2.3"); JPanel panelRight = new JPanel(); panelRight.setLayout(new GridLayout(3, 1)); panelRight.add(rb21); panelRight.add(rb22); panelRight.add(rb23); panelCenter.add(panelRight); JButton bClean = new JButton("Clean"); bClean.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { clean(getContentPane()); } }); JPanel panelBottom = new JPanel(); panelBottom.add(bClean); Container cp = getContentPane(); cp.setLayout(new BorderLayout()); cp.add(panelCenter, BorderLayout.CENTER); cp.add(panelBottom, BorderLayout.SOUTH); } protected void clean(Component comp) { if (comp instanceof JRadioButton) { ((JRadioButton) comp).setSelected(false); } else if (comp instanceof Container) { for (Component child: ((Container) comp).getComponents()) { clean(child); }; } } public static void main(String[] args) { FrameWithRadios frame = new FrameWithRadios(); frame.setSize(320, 200); frame.setVisible(true); } }并使用ButtonGroup取消选择所有内容的方法（以上内容不适用于ButtonGroup.clearSelection中的单选按钮。）

如何在JFrame中取消选择单选按钮

2 个答案: