如何从按钮组中选择jradiobutton

我只要把你的 JRadioButtons 并打电话 isSelected() . 如果你真的想从 ButtonGroup 你只能去看模特儿。您可以将模型与按钮匹配,但是如果您可以访问这些按钮,为什么不直接使用它们呢?

我也遇到了类似的问题,用这个解决了:

import java.util.Enumeration;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;

public class GroupButtonUtils {

    public String getSelectedButtonText(ButtonGroup buttonGroup) {
        for (Enumeration<AbstractButton> buttons = buttonGroup.getElements(); buttons.hasMoreElements();) {
            AbstractButton button = buttons.nextElement();

            if (button.isSelected()) {
                return button.getText();
            }
        }

        return null;
    }
}

它返回所选按钮的文本。

你必须增加 setActionCommand 到 JRadioButton 那么就这样做:

String entree = entreeGroup.getSelection().getActionCommand();

例子:

java = new JRadioButton("Java");
java.setActionCommand("Java");
c = new JRadioButton("C/C++");
c.setActionCommand("c");
System.out.println("Selected Radio Button: " + 
                    buttonGroup.getSelection().getActionCommand());

我建议在Swing中直接使用模型方法。在将组件放入面板和布局管理器之后,甚至不需要保留对它的特定引用。

如果您真的想要这个小部件,那么您可以用 isSelected 或维持 Map<ButtonModel,JRadioButton> .

您可以将和actioncommand放入每个单选按钮(字符串)。

this.jButton1.setActionCommand("dog");
this.jButton2.setActionCommand("cat");
this.jButton3.setActionCommand("bird");

假设它们已经在button group(本例中为state_group)中,您可以这样获得所选的单选按钮:

String selection = this.state_group.getSelection().getActionCommand();

希望这有帮助

以下代码显示 jradiobutton从buttonGroup中选择 单击按钮。
它是通过循环访问特定按钮组中的所有jradiobuttons来完成的。

 JRadioButton firstRadioButton=new JRadioButton("Female",true);  
 JRadioButton secondRadioButton=new JRadioButton("Male");  

 //Create a radio button group using ButtonGroup  
 ButtonGroup btngroup=new ButtonGroup();  

 btngroup.add(firstRadioButton);  
 btngroup.add(secondRadioButton);  

 //Create a button with text ( What i select )  
 JButton button=new JButton("What i select");  

 //Add action listener to created button  
 button.addActionListener(this);  

 //Get selected JRadioButton from ButtonGroup  
  public void actionPerformed(ActionEvent event)  
  {  
     if(event.getSource()==button)  
     {  
        Enumeration<AbstractButton> allRadioButton=btngroup.getElements();  
        while(allRadioButton.hasMoreElements())  
        {  
           JRadioButton temp=(JRadioButton)allRadioButton.nextElement();  
           if(temp.isSelected())  
           {  
            JOptionPane.showMessageDialog(null,"You select : "+temp.getText());  
           }  
        }            
     }
  }

您可以使用itemselevable(buttonmodel的superinterface)的getSelectedObjects(),它返回所选项目的列表。对于单选按钮组,它只能是一个或一个都不能。

将单选按钮添加到按钮组,然后:

buttonGroup.getSelection().getActionCommand

import javax.swing.Action;
import javax.swing.ButtonGroup;
import javax.swing.Icon;
import javax.swing.JRadioButton;
import javax.swing.JToggleButton;

public class RadioButton extends JRadioButton {

    public class RadioButtonModel extends JToggleButton.ToggleButtonModel {
        public Object[] getSelectedObjects() {
            if ( isSelected() ) {
                return new Object[] { RadioButton.this };
            } else {
                return new Object[0];
            }
        }

        public RadioButton getButton() { return RadioButton.this; }
    }

    public RadioButton() { super(); setModel(new RadioButtonModel()); }
    public RadioButton(Action action) { super(action); setModel(new RadioButtonModel()); }
    public RadioButton(Icon icon) { super(icon); setModel(new RadioButtonModel()); }
    public RadioButton(String text) { super(text); setModel(new RadioButtonModel()); }
    public RadioButton(Icon icon, boolean selected) { super(icon, selected); setModel(new RadioButtonModel()); }
    public RadioButton(String text, boolean selected) { super(text, selected); setModel(new RadioButtonModel()); }
    public RadioButton(String text, Icon icon) { super(text, icon); setModel(new RadioButtonModel()); }
    public RadioButton(String text, Icon icon, boolean selected) { super(text, icon, selected); setModel(new RadioButtonModel()); }

    public static void main(String[] args) {
        RadioButton b1 = new RadioButton("A");
        RadioButton b2 = new RadioButton("B");
        ButtonGroup group = new ButtonGroup();
        group.add(b1);
        group.add(b2);
        b2.setSelected(true);
        RadioButtonModel model = (RadioButtonModel)group.getSelection();
        System.out.println(model.getButton().getText());
    }
}

使用 isSelected() 方法。它会告诉你你的无线按钮的状态。将它与一个循环(比如for循环)结合使用,您可以找到已选择的循环。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*; 
public class MyJRadioButton extends JFrame implements ActionListener
{
    JRadioButton rb1,rb2;  //components
    ButtonGroup bg;
    MyJRadioButton()
{
    setLayout(new FlowLayout());
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    rb1=new JRadioButton("male");
    rb2=new JRadioButton("female");

    //add radio button to button group
    bg=new ButtonGroup();
    bg.add(rb1);
    bg.add(rb2);

    //add radio buttons to frame,not button group
    add(rb1);
    add(rb2);
    //add action listener to JRadioButton, not ButtonGroup
    rb1.addActionListener(this);
    rb2.addActionListener(this);
    pack();
    setVisible(true);
}
public static void main(String[] args)
{
    new MyJRadioButton(); //calling constructor
}
@Override
public void actionPerformed(ActionEvent e) 
{
    System.out.println(((JRadioButton) e.getSource()).getActionCommand());
}

}

jRadioOne = new javax.swing.JRadioButton();
jRadioTwo = new javax.swing.JRadioButton();
jRadioThree = new javax.swing.JRadioButton();

…然后对于每个按钮:

buttonGroup1.add(jRadioOne);
jRadioOne.setText("One");
jRadioOne.setActionCommand(ONE);
jRadioOne.addActionListener(radioButtonActionListener);

听者

ActionListener radioButtonActionListener = new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                radioButtonActionPerformed(evt);
            }
        };

…做任何你需要的事情作为对事件的回应

protected void radioButtonActionPerformed(ActionEvent evt) {            
       System.out.println(evt.getActionCommand());
    }