合肥搜索引擎推广,工具类网站怎么优化seo,比价 wordpress 插件,软件开发流程包括当显示一组JRadioButton时#xff0c;最初没有选择任何一个(除非您以编程方式强制执行)。我想要能够将按钮恢复到该状态#xff0c;即使在用户已经选择了一个之后#xff0c;即#xff0c;不应该选择任何按钮。然而#xff0c;使用通常的嫌疑不会提供所需的效果#xff1…当显示一组JRadioButton时最初没有选择任何一个(除非您以编程方式强制执行)。我想要能够将按钮恢复到该状态即使在用户已经选择了一个之后即不应该选择任何按钮。然而使用通常的嫌疑不会提供所需的效果调用’setSelected(false)’在每个按钮不工作。有趣的是当按钮未放入ButtonGroup时它会工作 – 不幸的是后者是JRadioButtons要求是互斥的。此外使用javax.swing.ButtonGroup的setSelected(ButtonModelboolean)方法不会做我想要的。我把一个小程序来展示效果两个单选按钮和一个JButton。单击JButton应取消选择单选按钮以使窗口看起来与它首次弹出时的完全一样。import java.awt.Container;import java.awt.GridLayout;import java.awt.event.*;import javax.swing.*;/*** This class creates two radio buttons and a JButton. Initially, none* of the radio buttons is selected. Clicking on the JButton should* always return the radio buttons into that initial state, i.e.,* should disable both radio buttons.*/public class RadioTest implements ActionListener {/* create two radio buttons and a group */private JRadioButton button1 new JRadioButton(button1);private JRadioButton button2 new JRadioButton(button2);private ButtonGroup group new ButtonGroup();/* clicking this button should unselect both button1 and button2 */private JButton unselectRadio new JButton(Unselect radio buttons.);/* In the constructor, set up the group and event listening */public RadioTest() {/* put the radio buttons in a group so they become mutually* exclusive -- without this, unselecting actually works! */group.add(button1);group.add(button2);/* listen to clicks on unselectRadio button */unselectRadio.addActionListener(this);}/* called when unselectRadio is clicked */public void actionPerformed(ActionEvent e) {/* variant1: disable both buttons directly.* ...doesnt work */button1.setSelected(false);button2.setSelected(false);/* variant2: disable the selection via the button group.* ...doesnt work either */group.setSelected(group.getSelection(), false);}/* Test: create a JFrame which displays the two radio buttons and* the unselect-button */public static void main(String[] args) {JFrame frame new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);RadioTest test new RadioTest();Container contentPane frame.getContentPane();contentPane.setLayout(new GridLayout(3,1));contentPane.add(test.button1);contentPane.add(test.button2);contentPane.add(test.unselectRadio);frame.setSize(400, 400);frame.setVisible(true);}}任何想法任何人谢谢
