如何在JFrame中取消选择单选按钮

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？此按钮将清洁辐射按钮和具有的文本.

行动的代码将使干净所有人认为:

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.你想要做的是调用clearSelection()这个ButtonGroup对象.

另外,您希望null在GUI中使用布局.虽然null布局和setBounds()Swing新手似乎是创建复杂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,它们不会调整组件的大小,它们是增强或维护的皇室女巫,当它们放置在滚动窗格中时它们会完全失败,当它们在所有平台上观看时或者与原始平台不同的屏幕分辨率时它们看起来很糟糕.

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();
            }
        });
    }
}