當顯示一組JRadioButton時，最初沒有選擇任何一個(除非您以編程方式強制執行)。我想要能夠將按鈕恢復到該狀態，即使在用戶已經選擇了一個之后，即，不應該選擇任何按鈕。

然而，使用通常的嫌疑不會提供所需的效果：調用’setSelected(false)’在每個按鈕不工作。有趣的是，當按鈕未放入ButtonGroup時，它會工作 – 不幸的是，后者是JRadioButtons要求是互斥的。

此外，使用javax.swing.ButtonGroup的setSelected(ButtonModel，boolean)方法不會做我想要的。

我把一個小程序來展示效果：兩個單選按鈕和一個JButton。單擊JButton應取消選擇單選按鈕，以使窗口看起來與它首次彈出時的完全一樣。

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.

* ...doesn't work */

button1.setSelected(false);

button2.setSelected(false);

/* variant2: disable the selection via the button group.

* ...doesn't 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？謝謝！

總結

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