怎么获取从引用自定义panel控件的frame里获取它的控件的值

如何获取从引用自定义panel控件的frame里获取它的控件的值？
以下是自定义的panel控件：

package snooker;


import java.awt.Component;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;


import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;


public class BeveragePanel extends JPanel

{

	public Component juice;

	public Component water;

	public Component beer;

	public Component vine;

	public Component soda;

	public Component sprite;

	public Component tea;

	public Component milk;

	public Component cola;


	public BeveragePanel()

	{

		setLayout(new GridLayout(3,3));

		juice=BeveragePanel("juice");

		water=BeveragePanel("water");

		beer=BeveragePanel("beer");

		vine=BeveragePanel("vine");

		soda=BeveragePanel("soda");

	    cola=BeveragePanel("cola");

		sprite=BeveragePanel("sprite");

		tea=BeveragePanel("tea");

		milk=BeveragePanel("milk");


		this.add(juice);

		this.add(water);

		this.add(beer);

		this.add(vine);

		this.add(soda);

		this.add(cola);

		this.add(sprite);

		this.add(tea);

		this.add(milk);



	}

	protected Component BeveragePanel(String BeveragePanel)

	{

		JPanel panel=new JPanel();

		JPanel bottomPanel=new JPanel();


		JLabel label=new JLabel(BeveragePanel,SwingUtilities.CENTER);

		String[] number = {"0","1", "2", "3", "4", "5","6","7","8","9","10" };

		JComboBox jComboBox = new JComboBox(number);


		bottomPanel.add(jComboBox);

		panel.add(label);

		panel.add(bottomPanel);

		panel.setLayout(new GridLayout(2,1));

		return panel;

	}

// don't know hao to get the value of the combobox. 

}

之后，这是主页面引用它的代码。

BeveragePanel beverage;

	        beverage=new BeveragePanel();

	        rightPanel.add(beverage,BorderLayout.NORTH);

	        rightPanel.add(buttonPanel,BorderLayout.SOUTH);

panel的大体样子为红色框内。


我想在frame里得到自定义panel里下拉框里面的值，应该要怎么做？谢谢。

------解决思路----------------------
例如 
BeveragePanel 里面实现个public方法

public String getBeer(){
return (String)beer.getSelectItem();
}


在frame里面 用 getBeer 访问。