Help with dropdown menu in JCombo box,Pleaseeeeeee

Question

Hi,
I posted earlier but I`II try again. Someone must know how to do this. I have a JComboBox and I want the drop down menu to be a bit wider then the comboBox.
I tried using this method
public void setPreferredSize()
          Dimension d = jcbo.getPreferredSize(d);
          jcbo.setPreferredSize(new Dimension(20, d.height));
          jcbo.setPopupWidth(d.width);
but I recieved a couldn`t resolve symbol error for the last line.
I imported these into the program]
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
Is there something else I should of imported as well to make this work, or is it another problem all together.Any help would be greatly appreciated.

Answer 1

Hi , What I want to do is have the dropmenu a bit wider then the comboBox. Here is my code.Please excuse any odd ball mistakes, At this point I have been trying anything.This is an exercise that I have to do fo a java assignment, Hence the weird GUI. In the example pic they gave me.It shows the dropmenu a bit wider than the comboBox, I am sure they through this in to screw with my brain, I have put comment tags Around the stuff I tried to use. Any help with this would be greatly appreciated.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//import javax.swing.plaf.basic.*;
public class Exercise9_3 extends JFrame implements ActionListener
     private JTextField nameField;
     private JTextArea nameArea;
     private JButton storeButton;
     private JComboBox jcbo;
     private JPopupMenu popup;
     protected int popupWidth;
     String newline = "\n";
     public Exercise9_3()
          createComponets();
          addComponets();
          setTitle("Exercise9_3");
     private void createComponets ()
          nameField = new JTextField(19);
          nameArea = new JTextArea(10, 15);
          storeButton = new JButton("Store");
          storeButton.addActionListener(this);
          jcbo = new JComboBox();
          jcbo.addActionListener(this);
     /*8public void setPreferredSize()
          Dimension d = jcbo.getPreferredSize(d);
          //jcbo.setPreferredSize(new Dimension(20, d.height));
          //jcbo.setPopupWidth(d.width);
     private void addComponets()
          JPanel p1 = new JPanel();
          p1.setLayout (new FlowLayout());
          p1.add(nameField);
          p1.add(nameArea);
          p1.add(jcbo);
          JPanel p2 = new JPanel();
          p2.setLayout (new FlowLayout());
          p2.add (storeButton);
          getContentPane().setLayout(new BorderLayout());
          getContentPane().add(p1, BorderLayout.CENTER);
          getContentPane().add(p2, BorderLayout.SOUTH);
     public void actionPerformed(ActionEvent e)
          if(e.getSource() == storeButton)
               String s = nameField.getText();
               jcbo.addItem(s);
               jcbo.setSelectedItem(s);
               String textArea = s ;
               String text = nameField.getText();
               nameArea.append(text + newline);
     nameField.selectAll();
     nameField.setText("");
     nameField.requestFocus();
          if (e.getSource() == jcbo)
/**retrieve the input as a string*/
String selectedName = (String)jcbo.getSelectedItem();
/**set the name that was selected from the ComboBox and add it to textfield*/
nameField.setText(selectedName);
     public static void main(String [] args)
          Exercise9_3 frame = new Exercise9_3();
          frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
          frame.pack();
          frame.setVisible(true);
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          int screenWidth = screenSize.width;
          int screenHeight = screenSize.height;
          // Get dimension of the frame
          Dimension frameSize = frame.getSize();
          int x = (screenWidth - frameSize.width)/2;
          int y = (screenHeight- frameSize.height)/2;
     frame.setLocation(x,y);