我的控制条有问题,不知道为什么,一出现的时候控制条是这样的:

然后稍微对边框的大小进行修改一下,控制条就成了这样:

怎么修改一下,希望可以使控制条一直是下面的状况呢?拜托了!!
这是代码
package Appliction;

import javax.swing.JFrame ;
import javax.swing.JPanel ;

import javax.media.ControllerEvent;
import javax.media.ControllerListener;
import javax.media.Manager;
import javax.media.NoPlayerException;
import javax.media.Player ;
import javax.media.PrefetchCompleteEvent;
import javax.media.RealizeCompleteEvent;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component ;
import java.awt.Dimension;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import java.io.IOException;
import java.net.URL;

public class My_MP3Player
{
private JFrame JF1 ;
// private JPanel JP1 ;
private Player player ;
private Component com_contrl ;
private ControllerListener conLis ;
private Dimension dim ;

//初始化播放器
private void ini_player(URL url) throws IOException
{
    try
    {
        player = Manager.createPlayer(url) ;
    }
    catch(NoPlayerException noE)
    {
        System.out.println("没有发现播放器存在");
        noE.printStackTrace() ;
    }
}

//初始化参数
private void ini_Field()
{
    JF1 = new JFrame("播放器") ;

// JP1 = new JPanel() ;
dim = new Dimension() ;
}

//注册controllerListener
private void register()
{
    conLis = new ControllerListener()
    {
        @Override
        public void controllerUpdate(ControllerEvent ce)
        {
            if(ce instanceof RealizeCompleteEvent)
            {
                player.prefetch() ; 
            }
            if(ce instanceof PrefetchCompleteEvent)
            {
                if(com_contrl != null)
                {
                    return ;
                }
                else if( (com_contrl = player.getControlPanelComponent())!= null )
                {

// JP1.add(com_contrl , BorderLayout.EAST) ;
JF1.add(com_contrl , BorderLayout.SOUTH) ;
dim = com_contrl.getPreferredSize();
}
else
{
System.out.println("添加组件失败");
}
}
}
} ;
player.addControllerListener(conLis) ;
}

//播放设置
private void player(URL url) throws IOException
{
    ini_Field() ;
    ini_player(url) ;
    JF1.addWindowListener(new WindowAdapter()
    {
        public void windowClosing(WindowEvent we)
        {
            if(player != null)
            {
                player.close();
            }
            System.exit(0);
        }
    });
    register() ;

// JP1.setPreferredSize(new Dimension(300+dim.width, 50+dim.height)) ;
// JP1.setBackground(Color.BLUE) ;
JF1.setSize(300 + dim.width , 320+dim.height) ;
// JF1.add(JP1 , BorderLayout.SOUTH) ;
JF1.validate() ;
JF1.setVisible(true) ;
player.realize() ;
player.start() ;
}

//构造函数
public My_MP3Player(URL url) throws IOException
{
    player(url) ;
}

//main函数
public static void main(String[] args) 
{
    try
    {
        URL url = new URL("file:///E:\\音乐\\Ours.mp3") ;
        if(url.getFile() == null)
        {
            throw new IOException("未找到文件") ;
        }
        else
        {
            new My_MP3Player(url) ;
        }
    }
    catch(IOException ioe)
    {
        ioe.printStackTrace() ;
    }
}   

}