Question

我的问题是我不知道如何检查单选按钮是否被选中，然后根据我选择的单选按钮选择不同的输出。基本上，正如我的代码现在一样，一旦选择了无线电按钮，就会永远选择它。如何根据选择的按钮修复我的代码以发送不同的输出？这是我的代码......

JRadioButton radioButton1;
JRadioButton radioButton2;
JRadioButton radioButton3;
JRadioButton radioButton4;
int button = 1;

...

private void createCourses(){

    JPanel eastPanel = new JPanel(new GridLayout(5, 1, 10, 10));

    eastPanel.setBounds(250, 50, 150, 120);
    eastPanel.setBorder(raisedetched);
    ButtonGroup radio = new ButtonGroup();

    JLabel label1 = new JLabel("Course offerings");
    radioButton1 = new JRadioButton();
    radioButton2 = new JRadioButton();
    radioButton3 = new JRadioButton();
    radioButton4 = new JRadioButton();

    eastPanel.add(label1);
    eastPanel.add(radioButton1);
    eastPanel.add(radioButton2);
    eastPanel.add(radioButton3);
    eastPanel.add(radioButton4);

    radio.add(radioButton1);
    radio.add(radioButton2);
    radio.add(radioButton3);
    radio.add(radioButton4);

    radioButton1.addItemListener(this);
    radioButton2.addItemListener(this);
    radioButton3.addItemListener(this);
    radioButton4.addItemListener(this);

    radioButton1.setSelected(true);

    radio.getSelection();
    contentPane.add(eastPanel);
    setVisible(true); 
    }

   public void itemStateChanged(ItemEvent e) {
   if(radioButton1.isSelected() == true){
    button = 1;
    myStats.setCourseOfferings(button);
}
else{
    radioButton1.setSelected(false);
}


if(radioButton2.isSelected() == true){
    button = 2;
    myStats.setCourseOfferings(button);
}

if(radioButton3.isSelected() == true){
    button = 3;
    myStats.setCourseOfferings(button);
}

if(radioButton4.isSelected() == true){
    button = 4;
    myStats.setCourseOfferings(button);
}
 }
 }

谢谢，任何帮助表示赞赏。

Answer 1

我建议你采用这种方法：

有一个变量可以保留所选的ID或数字，或者您希望作为myStats.setCourseOfferings()方法的参数传递的任何内容。
只需实施一个ActionListener即可收听来自JRadioButtons的动作事件。将此侦听器附加到每个单选按钮。请查看教程：How to Use Buttons, Check Boxes, and Radio Buttons以获取更多信息。
使用JComponent.putClientProperty()方法将值附加到每个单选按钮。
使用JCOmponent.getClientProperty()方法检索此值并更新第一步中定义的变量。

示例（它不是SSCCE，只是一个例子）

Integer selectedRadioButton = -1; //declared as class variable
final String COURSE_ID = "CourseID"; //declared class variable

...

ActionListener actionListener = new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent e) {
       if(e.getSource() instanceof JRadioButton) {
           JRadioButton radioButton = (JRadioButton)e.getSource();
           selectedRadioButton = (Integer)radioButton.getClientProperty(COURSE_ID);
       }
   }
};

JRadioButton radioButton1 = new JRadioButton("Radio 1");
radioButton1.putClientProperty(COURSE_ID, 1);
radioButton1.addActionListener(actionListener);

JRadioButton radioButton2 = new JRadioButton("Radio 2");
radioButton2.putClientProperty(COURSE_ID, 2);
radioButton2.addActionListener(actionListener);

// and so on

JButton submit = new JButton("Submit");
submit.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        myStats.setCourseOfferings(selectedRadioButton);
    }
});

Answer 2

为什么在addItemListener上使用addActionListener代替JRadioButton？

除此之外，这里有一个非常相似的程序，你可能想知道它与你的不同：http://docs.oracle.com/javase/tutorial/uiswing/components/button.html#radiobutton

根据单选按钮选择不同的输出

2 个答案:

示例（它不是SSCCE，只是一个例子）