How to Add Radiobuttons to a Combobox In Java Netbeans
In this Java Tutorial we will see How To Create a JCombobox With JRadioButtons Inside It In Java Using Netbeans.
What We Are Gonna Use In This Project:
- Java Programming Language.- NetBeans Editor.
Project Source Code:
package new_tutorials;
import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JRadioButton;
import javax.swing.ListCellRenderer;
/**
*
* @author 1BestCsharp
*/
public class RadioComboboxFrame extends JFrame{
private RadioComboboxElement selectedItem;
private JComboBox<RadioComboboxElement> comboBox;
private final JLabel selectedLabel;
public RadioComboboxFrame(){
// Set up the JFrame
setTitle("Radio-Combobox");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Set the layout manager for the JFrame
setLayout(new FlowLayout());
// Create a JComboBox and set its renderer
comboBox = new JComboBox<>();
comboBox.setRenderer(new RadioComboboxRenderer());
// Add three selectable items to the combobox
comboBox.addItem(new RadioComboboxElement("123", true));
comboBox.addItem(new RadioComboboxElement("456", false));
comboBox.addItem(new RadioComboboxElement("789", false));
// Set the first item as the default selection
selectedItem = comboBox.getItemAt(0);
selectedItem.setSelected(true);
// Add an item listener to handle item state changes
comboBox.addItemListener((e) -> {
RadioComboboxElement newItem = (RadioComboboxElement) comboBox.getSelectedItem();
// Deselect the previously selected item
if(selectedItem != null) { selectedItem.setSelected(false); }
// Select the new item and update the reference
if(newItem != null){
newItem.setSelected(true);
selectedItem = newItem;
}
// Update the label and repaint the combobox
updateSelectedLabel();
comboBox.repaint();
});
add(comboBox);
// Create and add a label to display the selected item
selectedLabel = new JLabel("Selected Item: " + selectedItem.getLabel());
add(selectedLabel);
setSize(300,200);
setLocationRelativeTo(null);
}
// Method to update the selected item label
private void updateSelectedLabel(){
selectedLabel.setText("Selected Item: " + (selectedItem != null ? selectedItem.getLabel() : ""));
}
// Inner class representing elements in the combobox
public static class RadioComboboxElement{
private final String label;
private boolean selected;
public RadioComboboxElement(String label, boolean selected){
this.label = label;
this.selected = selected;
}
public String getLabel(){ return label; }
public boolean isSelected(){ return selected; }
public void setSelected(boolean selected){ this.selected = selected; }
}
// Inner class implementing the renderer for the combobox
public class RadioComboboxRenderer extends JRadioButton implements ListCellRenderer<RadioComboboxElement>{
@Override
public Component getListCellRendererComponent(JList<? extends RadioComboboxElement> list, RadioComboboxElement value, int index, boolean isSelected, boolean cellHasFocus) {
// Set the state of the radio button based on the element's selection
setEnabled(list.isEnabled());
setSelected(value.isSelected());
setText(value.getLabel());
// Set the background and foreground colors based on the selection state
if(isSelected){
setBackground(Color.BLACK);
setForeground(Color.YELLOW);
}
else{
setBackground(Color.RED);
setForeground(Color.WHITE);
}
return this;
}
}
public static void main(String[] args) {
RadioComboboxFrame frame = new RadioComboboxFrame();
frame.setVisible(true);
}
}
The Final Result:
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