How do I get which JRadioButton is selected from a ButtonGroup

Question

I have a swing application that includes radio buttons on a form  I have the ButtonGroup  however  looking at the available methods  I can t seem to get the name of the selected JRadioButton  Here s what I can tell so far    From ButtonGroup  I can perform a getSelection   to return the ButtonModel  From there  I can perform a getActionCommand  but that doesn t seem to always work   I tried different tests and got unpredictable results  Also from ButtonGroup  I can get an Enumeration from getElements     However  then I would have to loop through each button just to check and see if it is the one selected    Is there an easier way to find out which button has been selected   I m programing this in Java 1 3 1 and Swing

User · Answer

Add the radiobuttons to a button group then   buttonGroup getSelection   getActionCommand

User · Answer

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

User · Answer

I suggest going straight for the model approach in Swing  After you ve put the component in the panel and layout manager  don t even bother keeping a specific reference to it   If you really want the widget  then you can test each with isSelected  or maintain a Map lt ButtonModel JRadioButton gt

User · Answer

I would just loop through your JRadioButtons and call isSelected    If you really want to go from the ButtonGroup you can only get to the models  You could match the models to the buttons  but then if you have access to the buttons  why not use them directly

User · Answer

Use the isSelected   method  It will tell you the state of your radioButton  Using it in combination with a loop say for loop  you can find which one has been selected

User · Answer

You could use getSelectedObjects   of ItemSelectable  superinterface of ButtonModel  which returns the list of selected items  In case of a radio button group it can only be one or none at all

User · Answer

I suggest going straight for the model approach in Swing  After you ve put the component in the panel and layout manager  don t even bother keeping a specific reference to it   If you really want the widget  then you can test each with isSelected  or maintain a Map lt ButtonModel JRadioButton gt

User · Answer

jRadioOne   new javax swing JRadioButton    jRadioTwo   new javax swing JRadioButton    jRadioThree   new javax swing JRadioButton          then for every button   buttonGroup1 add jRadioOne   jRadioOne setText  One    jRadioOne setActionCommand ONE   jRadioOne addActionListener radioButtonActionListener        listener  ActionListener radioButtonActionListener   new java awt event ActionListener                 public void actionPerformed java awt event ActionEvent evt                    radioButtonActionPerformed evt                                 do whatever you need as response to event  protected void radioButtonActionPerformed ActionEvent evt                       System out println evt getActionCommand

User · Answer

I got similar problem and solved with this   import java util Enumeration  import javax swing AbstractButton  import javax swing ButtonGroup   public class GroupButtonUtils        public String getSelectedButtonText ButtonGroup buttonGroup            for  Enumeration lt AbstractButton gt  buttons   buttonGroup getElements    buttons hasMoreElements                   AbstractButton button   buttons nextElement                 if  button isSelected                      return button getText                                     return null            It returns the text of the selected button

User · Answer

You could use getSelectedObjects   of ItemSelectable  superinterface of ButtonModel  which returns the list of selected items  In case of a radio button group it can only be one or none at all

User · Answer

You can put and actionCommand to each radio button  string    this jButton1 setActionCommand  dog    this jButton2 setActionCommand  cat    this jButton3 setActionCommand  bird      Assuming they re already in a ButtonGroup  state group in this case  you can get the selected radio button like this   String selection   this state group getSelection   getActionCommand      Hope this helps

User · Answer

You must add setActionCommand to the JRadioButton then just do   String entree   entreeGroup getSelection   getActionCommand      Example   java   new JRadioButton  Java    java setActionCommand  Java    c   new JRadioButton  C C      c setActionCommand  c    System out println  Selected Radio Button                           buttonGroup getSelection   getActionCommand

User · Answer

Typically  some object associated with the selected radio button is required  It is not necessarily a String representing the button s label  It could be an Integer containing the button s index or an object of more complicated type T  You could fill and use a Map lt ButtonModel  T gt  as Tom Hawtin suggested  but I propose to extend the model and place the objects there  Here s an improved ButtonGroup that uses this approach   import javax swing      SuppressWarnings  serial   public class SmartButtonGroup lt T gt  extends ButtonGroup        Override     public void add AbstractButton b            throw new UnsupportedOperationException  No object supplied               public void add JRadioButton button  T attachedObject            ExtendedModel lt T gt  model   new ExtendedModel lt  gt  attachedObject           model setSelected button isSelected             button setModel model           super add button               SuppressWarnings  unchecked       public T getSelectedObject             ButtonModel selModel   getSelection            return selModel    null     ExtendedModel lt T gt  selModel  obj   null             public static class ExtendedModel lt T gt  extends javax swing JToggleButton ToggleButtonModel           public T obj           private ExtendedModel T object                obj   object                      You can use this utility class instead of ButtonGroup  Create an object of this class and add buttons along with associated objects to it  For example   SmartButtonGroup lt Integer gt  group   new SmartButtonGroup lt  gt     JPanel panel   new JPanel     for  int i   1  i  lt   5  i          JRadioButton button   new JRadioButton  Button      i  i    3      select the 3rd button     group add button  i       panel add button       After this  you can get the object associated with the currently selected button anytime you need by simply calling getSelectedObject    like this   int selectedButtonIndex   group getSelectedObject      In case you need just the buttons themselves  you can use the next non-generic class instead   import javax swing JRadioButton    SuppressWarnings  serial   public class RadioButtonGroup extends SmartButtonGroup lt JRadioButton gt        public void add JRadioButton button            super add button  button               Override     public void add JRadioButton button  JRadioButton attachedObject            throw new UnsupportedOperationException  Use the short form of addition instead               public JRadioButton getSelectedButton             return getSelectedObject

User · Answer

The following code displays which JRadiobutton is selected from Buttongroup on click of a button  It is done by looping through all JRadioButtons in a particular buttonGroup    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 lt AbstractButton gt  allRadioButton btngroup getElements              while allRadioButton hasMoreElements                             JRadioButton temp  JRadioButton allRadioButton nextElement                 if temp isSelected                                 JOptionPane showMessageDialog null  You select     temp getText

User · Answer

Typically  some object associated with the selected radio button is required  It is not necessarily a String representing the button s label  It could be an Integer containing the button s index or an object of more complicated type T  You could fill and use a Map lt ButtonModel  T gt  as Tom Hawtin suggested  but I propose to extend the model and place the objects there  Here s an improved ButtonGroup that uses this approach   import javax swing      SuppressWarnings  serial   public class SmartButtonGroup lt T gt  extends ButtonGroup        Override     public void add AbstractButton b            throw new UnsupportedOperationException  No object supplied               public void add JRadioButton button  T attachedObject            ExtendedModel lt T gt  model   new ExtendedModel lt  gt  attachedObject           model setSelected button isSelected             button setModel model           super add button               SuppressWarnings  unchecked       public T getSelectedObject             ButtonModel selModel   getSelection            return selModel    null     ExtendedModel lt T gt  selModel  obj   null             public static class ExtendedModel lt T gt  extends javax swing JToggleButton ToggleButtonModel           public T obj           private ExtendedModel T object                obj   object                      You can use this utility class instead of ButtonGroup  Create an object of this class and add buttons along with associated objects to it  For example   SmartButtonGroup lt Integer gt  group   new SmartButtonGroup lt  gt     JPanel panel   new JPanel     for  int i   1  i  lt   5  i          JRadioButton button   new JRadioButton  Button      i  i    3      select the 3rd button     group add button  i       panel add button       After this  you can get the object associated with the currently selected button anytime you need by simply calling getSelectedObject    like this   int selectedButtonIndex   group getSelectedObject      In case you need just the buttons themselves  you can use the next non-generic class instead   import javax swing JRadioButton    SuppressWarnings  serial   public class RadioButtonGroup extends SmartButtonGroup lt JRadioButton gt        public void add JRadioButton button            super add button  button               Override     public void add JRadioButton button  JRadioButton attachedObject            throw new UnsupportedOperationException  Use the short form of addition instead               public JRadioButton getSelectedButton             return getSelectedObject

User · Answer

jRadioOne   new javax swing JRadioButton    jRadioTwo   new javax swing JRadioButton    jRadioThree   new javax swing JRadioButton          then for every button   buttonGroup1 add jRadioOne   jRadioOne setText  One    jRadioOne setActionCommand ONE   jRadioOne addActionListener radioButtonActionListener        listener  ActionListener radioButtonActionListener   new java awt event ActionListener                 public void actionPerformed java awt event ActionEvent evt                    radioButtonActionPerformed evt                                 do whatever you need as response to event  protected void radioButtonActionPerformed ActionEvent evt                       System out println evt getActionCommand

User · Answer

jRadioOne   new javax swing JRadioButton    jRadioTwo   new javax swing JRadioButton    jRadioThree   new javax swing JRadioButton          then for every button   buttonGroup1 add jRadioOne   jRadioOne setText  One    jRadioOne setActionCommand ONE   jRadioOne addActionListener radioButtonActionListener        listener  ActionListener radioButtonActionListener   new java awt event ActionListener                 public void actionPerformed java awt event ActionEvent evt                    radioButtonActionPerformed evt                                 do whatever you need as response to event  protected void radioButtonActionPerformed ActionEvent evt                       System out println evt getActionCommand

User · Answer

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

User · Answer

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

User · Answer

I would just loop through your JRadioButtons and call isSelected    If you really want to go from the ButtonGroup you can only get to the models  You could match the models to the buttons  but then if you have access to the buttons  why not use them directly

User · Answer

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

User · Answer

You can put and actionCommand to each radio button  string    this jButton1 setActionCommand  dog    this jButton2 setActionCommand  cat    this jButton3 setActionCommand  bird      Assuming they re already in a ButtonGroup  state group in this case  you can get the selected radio button like this   String selection   this state group getSelection   getActionCommand      Hope this helps

User · Answer

You could use getSelectedObjects   of ItemSelectable  superinterface of ButtonModel  which returns the list of selected items  In case of a radio button group it can only be one or none at all

User · Answer

Add the radiobuttons to a button group then   buttonGroup getSelection   getActionCommand

User · Answer

I got similar problem and solved with this   import java util Enumeration  import javax swing AbstractButton  import javax swing ButtonGroup   public class GroupButtonUtils        public String getSelectedButtonText ButtonGroup buttonGroup            for  Enumeration lt AbstractButton gt  buttons   buttonGroup getElements    buttons hasMoreElements                   AbstractButton button   buttons nextElement                 if  button isSelected                      return button getText                                     return null            It returns the text of the selected button

User · Answer

I suggest going straight for the model approach in Swing  After you ve put the component in the panel and layout manager  don t even bother keeping a specific reference to it   If you really want the widget  then you can test each with isSelected  or maintain a Map lt ButtonModel JRadioButton gt

User · Answer

jRadioOne   new javax swing JRadioButton    jRadioTwo   new javax swing JRadioButton    jRadioThree   new javax swing JRadioButton          then for every button   buttonGroup1 add jRadioOne   jRadioOne setText  One    jRadioOne setActionCommand ONE   jRadioOne addActionListener radioButtonActionListener        listener  ActionListener radioButtonActionListener   new java awt event ActionListener                 public void actionPerformed java awt event ActionEvent evt                    radioButtonActionPerformed evt                                 do whatever you need as response to event  protected void radioButtonActionPerformed ActionEvent evt                       System out println evt getActionCommand

User · Answer

I would just loop through your JRadioButtons and call isSelected    If you really want to go from the ButtonGroup you can only get to the models  You could match the models to the buttons  but then if you have access to the buttons  why not use them directly

User · Answer

I suggest going straight for the model approach in Swing  After you ve put the component in the panel and layout manager  don t even bother keeping a specific reference to it   If you really want the widget  then you can test each with isSelected  or maintain a Map lt ButtonModel JRadioButton gt

User · Answer

You could use getSelectedObjects   of ItemSelectable  superinterface of ButtonModel  which returns the list of selected items  In case of a radio button group it can only be one or none at all

User · Answer

The following code displays which JRadiobutton is selected from Buttongroup on click of a button  It is done by looping through all JRadioButtons in a particular buttonGroup    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 lt AbstractButton gt  allRadioButton btngroup getElements              while allRadioButton hasMoreElements                             JRadioButton temp  JRadioButton allRadioButton nextElement                 if temp isSelected                                 JOptionPane showMessageDialog null  You select     temp getText

User · Answer

You must add setActionCommand to the JRadioButton then just do   String entree   entreeGroup getSelection   getActionCommand      Example   java   new JRadioButton  Java    java setActionCommand  Java    c   new JRadioButton  C C      c setActionCommand  c    System out println  Selected Radio Button                           buttonGroup getSelection   getActionCommand

User · Answer

I would just loop through your JRadioButtons and call isSelected    If you really want to go from the ButtonGroup you can only get to the models  You could match the models to the buttons  but then if you have access to the buttons  why not use them directly

User · Answer

Use the isSelected   method  It will tell you the state of your radioButton  Using it in combination with a loop say for loop  you can find which one has been selected

[java] How do I get which JRadioButton is selected from a ButtonGroup

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