How to set selected index JComboBox by value

Question

I want to set the selected index in a JComboBox by the value not the index  How to do that  Example  public class ComboItem        private String value      private String label       public ComboItem String value  String label            this value   value          this label   label             public String getValue             return this value             public String getLabel             return this label              Override     public String toString             return label           JComboBox test   new JComboBox    test addItem new ComboItem 0   orange     test addItem new ComboItem 1   pear     test addItem new ComboItem 2   apple     test addItem new ComboItem 3   banana     test setSelectedItem  banana      Ok  I have modified my question a bit  I forgot that i have a custom item inside my JComboBox that makes it a bit more difficult  i cant do setSelectedItem as i have a ComboItem inside each item  So still  how do i get this done

User · Answer

The right way to set an item selected when the combobox is populated by some class' constructor (as @milosz posted):

combobox.getModel().setSelectedItem(new ClassName(parameter1, parameter2));

In your case the code would be:

test.getModel().setSelectedItem(new ComboItem(3, "banana"));

User · Answer

Just call comboBox updateUI   after doing comboBox setSelectedItem or comboBox setSelectedIndex or comboModel setSelectedItem

User · Answer

for example    import java awt GridLayout  import java awt event ActionEvent  import java awt event ActionListener  import javax swing JButton  import javax swing JComboBox  import javax swing JFrame  import javax swing JOptionPane  import javax swing SwingUtilities   public class ComboboxExample        private JFrame frame   new JFrame  Test        private JComboBox comboBox   new JComboBox         public ComboboxExample             createGui               private void createGui             comboBox addItem  One            comboBox addItem  Two            comboBox addItem  Three            JButton button   new JButton  Show Selected            button addActionListener new ActionListener                   Override             public void actionPerformed ActionEvent e                    JOptionPane showMessageDialog frame   Selected item      comboBox getSelectedItem                     javax swing SwingUtilities invokeLater new Runnable                           Override                     public void run                             comboBox requestFocus                            comboBox requestFocusInWindow                                                                                JButton button1   new JButton  Append Items            button1 addActionListener new ActionListener                   Override             public void actionPerformed ActionEvent e                    appendCbItem                                      JButton button2   new JButton  Reduce Items            button2 addActionListener new ActionListener                   Override             public void actionPerformed ActionEvent e                    reduceCbItem                                      frame setDefaultCloseOperation JFrame EXIT ON CLOSE           frame setLayout new GridLayout 4  1            frame add comboBox           frame add button           frame add button1           frame add button2           frame setLocation 200  200           frame pack            frame setVisible true           selectFirstItem               public void appendCbItem             javax swing SwingUtilities invokeLater new Runnable                   Override             public void run                     comboBox addItem  Four                    comboBox addItem  Five                    comboBox addItem  Six                    comboBox setSelectedItem  Six                    requestCbFocus                                         public void reduceCbItem             javax swing SwingUtilities invokeLater new Runnable                   Override             public void run                     comboBox removeItem  Four                    comboBox removeItem  Five                    comboBox removeItem  Six                    selectFirstItem                                         public void selectFirstItem             javax swing SwingUtilities invokeLater new Runnable                   Override             public void run                     comboBox setSelectedIndex 0                   requestCbFocus                                         public void requestCbFocus             javax swing SwingUtilities invokeLater new Runnable                   Override             public void run                     comboBox requestFocus                    comboBox requestFocusInWindow                                         public static void main String   args            SwingUtilities invokeLater new Runnable                   Override             public void run                     ComboboxExample comboboxExample   new ComboboxExample

User · Answer

setSelectedItem  banana    You could have found it yourself by just reading the javadoc   Edit  since you changed the question  I ll change my answer   If you want to select the item having the  banana  label  then you have two solutions    Iterate through the items to find the one  or the index of the one  which has the given label  and then call setSelectedItem theFoundItem   or setSelectedIndex theFoundIndex   Override equals and hashCode in ComboItem so that two ComboItem instances having the same name are equal  and simply use setSelectedItem new ComboItem anyNumber   banana

User · Answer

Why not take a collection  likely a Map such as a HashMap  and use it as the nucleus of your own combo box model class that implements the ComboBoxModel interface  Then you could access your combo box s items easily via their key Strings rather than ints   For instance     import java util HashMap  import java util Map   import javax swing ComboBoxModel  import javax swing event ListDataListener   public class MyComboModel lt K  V gt    implements ComboBoxModel      private Map lt K  V gt  nucleus   new HashMap lt K  V gt                any constructors that you want would go here     public void put K key  V value          nucleus put key  value            public V get K key          return nucleus get key             Override    public void addListDataListener ListDataListener arg0             TODO Auto-generated method stub                  plus all the other methods required by the interface

User · Answer

public boolean  preencherjTextCombox            int x   Integer parseInt TableModelo getModel   getValueAt TableModelo getSelectedRow   0  toString             modeloobj   modelosDAO pesquisar x          Combmarcass getModel   setSelectedItem modeloobj getMarca              txtCodigo setText String valueOf modeloobj getCodigo             txtDescricao setText String valueOf modeloobj getDescricao             txtPotencia setText String valueOf modeloobj getPotencia                return true

User · Answer

public static void setSelectedValue JComboBox comboBox  int value                ComboItem item          for  int i   0  i  lt  comboBox getItemCount    i                          item    ComboItem comboBox getItemAt i               if  item getValue   equalsIgnoreCase value                                 comboBox setSelectedIndex i                   break                                  Hope this help

User · Answer

You should use model  comboBox getModel   setSelectedItem object

User · Answer

http   docs oracle com javase 6 docs api javax swing JComboBox html setSelectedItem java lang Object   test setSelectedItem  banana      There are some caveats or potentially unexpected behavior as explained in the javadoc  Make sure to read that

[java] How to set selected index JComboBox by value

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