Re: Setting Opaque false on JComboBox

try this for all but the drop-down

import javax.swing.*;
import java.awt.*;
class Testing extends JFrame
{
JComboBox cbo = new JComboBox(new String[]{"London","Madrid","New
York","Rome","Sydney"});
public Testing()
{
setSize(150,75);
setLocation(400,300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
JPanel jp = new JPanel();
jp.setBackground(Color.RED);
cbo.setEditable(true);
cbo.getEditor().getEditorComponent().setFocusable(false);//remove
for editable
cbo.setOpaque(false);
makeTransparent(cbo.getComponents());
jp.add(cbo);
getContentPane().add(jp);
}
public void makeTransparent(Component[] comp)
{
for(int x = 0; x < comp.length; x++)
{
if(comp[x] instanceof javax.swing.plaf.metal.MetalComboBoxButton)
{

((javax.swing.plaf.metal.MetalComboBoxButton)comp[x]).setOpaque(false);

((javax.swing.plaf.metal.MetalComboBoxButton)comp[x]).setBorder(null);
}
else if(comp[x] instanceof JTextField)
{
((JTextField)comp[x]).setOpaque(false);
((JTextField)comp[x]).setBorder(null);
}
}
}
public static void main(String args[]){new
Testing().setVisible(true);}
}

.